DatesCourse TitleInstructorCategorySubcategoryRegistration
0000010 Oct — 19 Dec 2023Geological CO2 Storage
An EAGE Extensive Online Course
A. Busch, E. Mackay, F. Doster, M. Landro, P. RingroseEnergy TransitionEnergy TransitionExtensive Online Course2023OctoberEAGE
000018 Nov — 8 Dec 2023Introduction to Machine Learning for Geophysical Applications
An EAGE Extensive Online Course
Jaap MondtData ScienceMachine LearningExtensive Online Course2023NovemberEAGE
000024 Dec 2023E-Lecture on Analysis of a Local Earthquake in the Arctic using a 120 km long Fibre-Optic Cable
E-Lecture Webinar
Robin RorstadbotnenE-Lecture Webinar2023DecemberEAGE
000034–7 Dec 2023Geophysical Data Analysis: Concepts & Examples
Interactive Online Short Course
Robert GodfreyGeophysicsSeismic ProcessingInteractive Online Short Course2023DecemberEAGE
0000414 Dec 2023E-Lecture on Joint Inversion of Gravity and Magnetic fields: the Mediterranean Sea case study
E-Lecture Webinar
Dr Daniele SampietroE-Lecture Webinar2023DecemberEAGE
0000511 Jan 2024DLP Webinar on Tunnel Seismics for Mineral Exploration – Is it Worth the Effort?
Distinguished Lecturer Webinar
Musa MansiDistinguished Lecturer Webinar2024JanuaryEAGE
0000611 Jan — 15 Feb 2024Navigating Career Challenges and Opportunities of the Energy Transition
An EAGE Extensive Online Course
Esther Bloem, Lucia Levato, Gwenola MichaudTraining and DevelopmentSoft SkillsExtensive Online Course2024JanuaryEAGE
0000715 Jan 2024DLP Webinar on Effect of induced polarization on galvanic and inductive data: where is it stronger?
Distinguished Lecturer Webinar
Gianluca FiandacaDistinguished Lecturer Webinar2024JanuaryEAGE
0000821–22 Feb 2024Beyond Conventional Seismic Imaging
Interactive Online Short Course
Prof. Evgeny LandaGeophysicsSurface ImagingInteractive Online Short Course2024FebruaryEAGEI. Wavefield Data AnalysisTime images usually provide sufficient information for a variety ofsubsurface models of moderate complexity and facilitate the estimationof the model for depth migration. Improving the quality of timesections remains the focus of intensive research. In particular, a lotof efforts are directed towards improving the accuracy of moveoutcorrection. The proposed course discusses time imaging proceduressuch as Multifocusing and Common Reflection Surface when eachimage trace is constructed by stacking traces which need not belongto the same CMP gather. In this case a new and more general moveoutcorrection is requested. These new methods open a way forreliable wavefield analysis and wavefront parameters estimation. Thelatest represents a basis for different applications including signal enhancement,velocity model building, statics correction, AVO analysis.II. Seismic DiffractionCurrently applied seismic processing and imaging are almost exclusivelybased on seismic reflection. The latest is the response tocontinuity in the subsurface. At the same time accurate and reliableimaging of small scale geological elements and discontinuities of thesubsurface such as faults, unconformity, fractures etc. are a key toimprove seismic resolution. In unconventional reservoirs the mainobjective is detection of fracture corridors. Small scale objects giverise to a diffraction response. Use of seismic diffraction is a rapidlyemerging technology which has tremendous potential to reduceexploration and production risks and increase oil and gas recovery.The course integrates elements of the theory of wave propagation,diffraction modeling and imaging, and interpretation. The main objectivesare: understanding the role of small and medium scale subsurfaceobjects and elements in forming the total seismic wavefieldand using diffraction for imaging.III. Imaging without precise knowledge of the subsurfacevelocity modelIn the proposed course I introduce a way to look at model-independentseismic imaging using the quantum mechanics concept. CanFeynman’ path-integral idea be used for seismic imaging? We canconstruct the seismic image by summation over the contributionsof elementary signals propagated along a representative sample ofpossible paths between the source and receiver points. When the velocitymodel is estimated with uncertainties, a single stationary pathdoes not produce a correctly focused subsurface image. In contrary,quantum imaging uses all possible trajectories accounts for multiplestationary paths and takes into account model uncertainties.IV. Pitfalls and challenges of seismic inversionProposed solutions are usually based on the criterion of the best fitbetween calculated and observed data. But it is well understood thatby itself, a good fit does not guarantee that an inverted model iscorrect. Seismic inversion may lead to construction of several subsurfacemodels with significantly different geological meaning, all ofwhich fit the observed data equally well. The ill-posedness of seismicinverse problems is fundamental and does not depend on a particulartype of algorithm or on the approach underlying the algorithms. Inthis course, I formulate a number of fundamental questions whichshould be addressed to make the inverse problems a mature sciencerather than a set of recipes.V. Time Reversal in SeismicTime Reversal (TR) plays an important role in seismic. It is directly connectedto reverse time migration, interferometry and virtual sourcemethods. Recently time reversal is proposed to localize subsurfacesources in passive seismic and scatterers in active seismic surveys.Unlike in conventional migration, time reversal approach, in principle,does not require application of imaging condition. Numericalimplementation of the time reversal method uses back propagationof the time-reversed recorded wavefield followed by an analysis of itsobtained focusing. The physical implementation of TR, called TimeReversal Mirror (TRM), is used in various applications: underwateracoustics, telecommunication, cancer therapy, lithotripsy, nondestructivetesting, etc. I demonstrate physical implementation of theTRM in seismic. Results of the field experiment show very promisingresults. I discuss possible applications of the method in seismic explorationand production. Upon completion of the course, participants will be able to:1. Understand the role of time and depth imaging withing the generalexploration work-flow.2. Understand the differences between several prestack data analysisapproaches, in particular CMP, CRS andincrease MF.3. Appreciate importance and potential of seismic diffraction forincrease resolution and reliability of seismic imaging.4. Understand the uncertain nature of seismic velocity model andacquaintance to a way of taking the uncertainties into account.5. Understand and admit fundamental problems of seismic inversionincluding FWI. Introduction•rom statistics to determinism•vercoming uncertaintiesI. Non CMP-based methods for data analysis and imaging•ime versus depth imaging•hy CMP method works?•on-hyperbolic moveout•hy CMP method fails?•on-CMP based moveout: principles•avefront parameter estimation: Multifocusing and CommonReflection Stack•pplications: signal enhancement, statics correction, multipleattenuation, stack, migrationII. Seismic Diffraction•eflections versus difraction•istory•odeling•iffraction imaging•avefield separation•ase studiesIII. Imaging without precise velocity model: Quantum seismic imaging•eynman “ath-summation”icture of the world•ath-summation seismic imagingIV. Pitfalls and challenges of seismic inversion•nversion –hinking backward•on-uniqueness of geophysical inversion•WI: the present statusV. Time Reversal in Seismic Participants should have a basic knowledge of seismic data acquisitionand processing, static correction, CMP stacking for zero-offsetapproximation, normal moveout (NMO) correction, velocity analysis,semblance coherency measure, ray theory. Basic knowledge of seismic data acquisition and processing. staticcorrection, CMP stacking for zero-offset approximation, normalmoveout (NMO) correction, velocity analysis, semblance coherencymeasure, dip moveout. Basic knowledge in ray theory. depth migration diffraction faults fractures full wavefield imaging inversion stacking time migration traveltime uncertainty unconventional velocities wave propagation
0000912–14 Mar 2024Rock Physics for Quantitative Seismic Reservoir Characterization
Interactive Online Short Course
Prof Tapan MukerjiReservoir CharacterizationRock PhysicsInteractive Online Short Course2024MarchEAGEThe purpose of the course is to give an overview of rock physicsobservations and models relating reservoir properties such as saturation,lithology, clay content, and pore pressure and their seismic signatures.Understanding this relation can help to improve quantitativeseismic interpretation. The course covers fundamentals of Rock Physicsranging from basic laboratory and theoretical results to practical“ecipes”hat can be immediately applied in the field. Applicationof quantitative tools for understanding and predicting the effects oflithology, pore fluid types and saturation, saturation scales, stress,pore pressure and temperature, and fractures on seismic velocity.Use of rock physics models requires understanding the assumptionsand pitfalls of each model and the uncertainties associated withthe interpretations using these models. Analysis of case studies andstrategies for quantitative seismic interpretation using statistical rockphysics work flows, and suggestions for more effectively employingseismic-to-rock properties transforms in Bayesian machine learningfor reservoir characterization and monitoring, with emphasis on seismicinterpretation and uncertainty quantification for lithology andsubsurface fluid detection. On completion of the course, participants will be able to:•se rock physics models with a better understanding of assumptionsand pitfalls;•ombine statistical rock physics in quantitative seismic interpretationworkflows;•elect appropriate rock physics models for reservoir characterization;•se rock physics models to build appropriate training sets forBayesian machine learning applications in quantitative seismicinterpretation. •ntroduction to Rock Physics, motivation, introductory examples•arameters that influence seismic velocities - conceptual overview•ffects of fluids, stress, pore pressure, temperature, porosity, fractures•ounding methods for robust modeling of seismic velocities•ffective media models for elastic properties of rocks•assmann Fluid substitution –ses, abuses, and pitfalls•erivation, recipe and examples, useful approximations•artial saturation and the relation of velocities to reservoir processes•he importance of saturation scales and their effect on seismicvelocity•haly sands and their seismic signatures•ranular media models, unconsolidated sand model, cementedsand model•elocity dispersion and attenuation; Velocity Upscaling•ock Physics of AVO interpretation and Vp/Vs relations•uantitative seismic interpretation and rock physics templates•tatistical rock physics, Bayesian machine learning and uncertaintyquantification•ock physics modeling to augment deep learning training data•xample case studies using AVO and seismic impedance for quantitativereservoir characterization The course is recommended for all geophysicists, reservoir geologists,seismic interpreters, and engineers concerned with reservoir characterization,reservoir delineation, hydrocarbon detection, reservoirdevelopment and recovery monitoring. No specific prerequisites needed. elasticity integration interpretation lithology modeling offshore oil and gas porosity reservoir characterization rock physics sandstone saturation shale uncertainty workflows
0001018–21 Mar 2024Borehole Seismic Fundamentals and Introduction to Advanced Techniques
Interactive Online Short Course
Allan CampbellGeophysicsSeismic ProcessingInteractive Online Short Course2024MarchEAGEThis course has 6 sections. The course moves from giving a basicunderstanding of the most common surveys towards the newesttechniques being developed to solve modern problems.1. Introduction to Vertical Seismic ProfilingThe VSP techniques used in industry are introduced. Basics ofwireline acquisition, and an introduction to fiber based acquisitionare covered. This section gives a brief overview of the value of allthe commonly used borehole seismic techniques, from checkshotthrough to 3D VSP.2. The BasicsCheckshot (velocity survey) and zero-offset VSPs are widely used, aresimple to acquire and process, and have huge value. This section willdescribe acquisition, processing and interpretation of these basic, butpossibly the most important, surveys.3. 2D and 3D ImagingThis section will focus on designing and interpreting walkaway VSPand 3D VSP surveys. Down-hole receivers create the opportunity forhigher resolution images than surface seismic can provide, and canprovide images in poor seismic imaging areas, or images where surfaceaccess is difficult. Advanced processing techniques will be discussed.Specifics of survey planning and acquisition will be covered.4. Anisotropy and MoreThe anisotropy module will focus on extracting VTI and HTI anisotropyparameters from walkaway VSP and 3D VSP surveys. Seismic maybe improperly imaged due to poor anisotropy assumptions. Stressand fracturing information may be deduced from seismic and validatedwith VSP. Having receivers down-hole and sources at the surfacecreates an ideal opportunity to measure anisotropy in-situ. Groundtruth measurement of AVO can be made with receivers downhole,this section describes the various VSP AVO techniques in commonuse. Downhole arrays are also ideal for locating multiple generatorsand measuring Q which we cover in this section.5. Reservoir Monitoring and Reservoir PropertiesThis section focuses on time-lapse 3D VSP, which can observe reservoirchanges with a greater precision than is possible with surfaceseismic. There is an overview of fracture detection and orientationwith VSPs. Elastic FWI is being developed to measure the reservoir’elastic properties, and will be briefly covered. A discussion on veryhigh resolution imaging and tomography with Crosswell seismicfinishes the module.6. Advanced AcquisitionTechnology marches forward as limitations are reached in wireline acquisition.Putting the receivers in the drill string to get real-time VSPs(while drilling) is becoming routine. Optical fiber (DAS) recording isan emerging technology which enables efficient, fit-for-purpose VSPsurveys with cost benefits over traditional wireline technology. Upon completion of the course, participants will know the basics ofacquiring and processing borehole seismic data. They will also befamiliar with the latest borehole seismic techniques in:•igh resolution imaging using 2D and 3D VSP surveys;•nisotropy determination and fracture analysis;•eservoir monitoring using time lapse VSP and crosswell seismic;•lternative acquisition schemes such as SWD and DAS.Participants will have a better understanding of the role of boreholeseismic techniques in hydrocarbon exploration and production. Theywill be able to more knowledgeably participate in the design, planningand execution of advanced surveys and be comfortable with theinterpretation of these surveys. The course will contain the following modules:1. Introduction to Vertical Seismic Profiling (1.5hrs)2. The Basics (2 hrs)a. Checkshot VSPb. Zero Offset VSP3. VSP Imaging: 2D and 3D Techniques (2 hrs)a. Survey design and modelingb. Processing- model building, tomography, imaging techniques (Kirchhoff,RTM)c. 2D imaging- Offset VSP, Walkaway VSPd. 3D imaging4. Anisotropy and More (3 hrs)a. Measuring anisotropy with walkaway and 3D VSPs-VTI and HTI, fracturesb. AVO Analysisc. Techniques to locate multiple generators with VSP datad. Q estimation and Q compensation with VSP data5. Reservoir Monitoring and Reservoir Properties (1.5 hrs)a. Time Lapse 3D VSP for reservoir monitoringb. Elastic FWI (VSP Inversion)6. Advanced Acquisition (1.5hrs)a. Seismic while drillingb. Distributed Acoustic SensingTiming of sections may change. The course is targeted toward those who have a basic understandingof surface seismic acquisition and processing, but only limited knowledgeof borehole seismic. The course is designed to help participantsidentify borehole seismic solutions to common seismic interpretationproblems. It is also be useful for those geophysicists needing higherresolution images than surface seismic can provide, and those geophysicistswho need to validate seismic processing parameters andimaging models using borehole seismic. Lastly, the course is relevantfor geophysicists wanting to learn how to use borehole seismic as acost-effective reservoir monitoring tool. Participants are assumed to have knowledge of seismic responseto earth reflectivity. Participants should be aware of common welllogging services. 2d 3d 4d anisotropy attenuation avo borehole geophysics case study fractures full wavefield imaging kirchhoff land seismic marine seismic offshore oil and gas rtm time-lapse tomography traveltime velocities vsp vti
000119–10 Apr 20243D Printing Geological Models for Education, Research, and Technical Communication
Interactive Online Short Course
Dr Franciszek Hasiuk & Prof Sergey IshutovReservoir CharacterizationRock PhysicsInteractive Online Short Course2024AprilEAGE
00012On DemandCarbonate Reservoir Characterization
Self-paced Online Course
Dr Laura GalluccioGeologyCarbonate GeologySelf-paced Online Course2023DecemberEAGEgeology carbonate geology
00013On DemandEET 13: Velocities, Imaging, and Waveform Inversion - The Evolution of Characterizing the Earth's Subsurface
Self-paced Online Course
Dr Ian JonesGeophysicsSeismic ProcessingSelf-paced Online Course2023DecemberEAGEgeophysics seismic processing
00014On DemandGeostatistical Reservoir Modeling
Self-paced Online Course
Prof. Dario GranaGeophysicsSeismic Reservoir CharacterizationSelf-paced Online Course2023DecemberEAGEgeophysics seismic reservoir characterization
00015On DemandShell: Geology for Non-geologists
Self-paced Online Course
Young-Kon Yong (main instructor)GeologyGeological ModelingSelf-paced Online Course2023DecemberEAGEgeology geological modeling
00016On DemandMetakinetic: Borehole Breakout Analysis
Partner Course
Simulation-based trainingGeologyGeomechanicsPartner Course2023DecemberMetakineticgeology geomechanics
00017On DemandMetakinetic: Detectability Analysis
Partner Course
Simulation-based trainingGeophysicsPassive SeismicPartner Course2023DecemberMetakineticgeophysics passive seismic
00018On DemandMetakinetic: PVT Analysis
Partner Course
Simulation-based trainingEngineeringReservoir EngineeringPartner Course2023DecemberMetakineticengineering reservoir engineering
00019On DemandMetakinetic: Rock Mass Rating
Partner Course
Simulation-based trainingEngineeringRock MechanicsPartner Course2023DecemberMetakineticengineering rock mechanics
00020On DemandMetakinetic: Volume of Shale - Gamma Ray Log
Partner Course
Simulation-based trainingGeologyPetrophysicsPartner Course2023DecemberMetakineticgeology petrophysics
00021On DemandMetakinetic: Wedge modeling
Partner Course
Simulation-based trainingGeophysicsSeismic ProcessingPartner Course2023DecemberMetakineticgeophysics seismic processing
00022On DemandSketch-based Geological Modelling and Flow Diagnostics: Geothermal and Subsurface Storage Applications
E-Lecture Recording
Carl JacquemynNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEmost subsurface geoenergy applications (e.g. ccs; h 2 and gas storage; geothermal…) use geomodelling to calculate volumetrics, plan for production/injection of fluids, and/or minimise and mitigate risk due to geological uncertainty. modelling workflows are often too time-consuming and computationally expensive to capture the full extent of the uncertainty space and scale. sketch-based modelling with flow diagnostics provides a prototyping approach to quickly build geomodels and generate quantitative results to evaluate volumetrics and flow behaviour. this approach allows users to rapidly test the sensitivity of model outputs to different geological concepts and uncertain parameters, and informs selection of geological concepts, scales and resolutions to be investigated in more detailed models. rapid reservoir modelling (rrm) is a sketch-based modelling tool with an intuitive interface that allows users to rapidly sketch geological models in 3d. geological models that capture the essence of heterogeneity of interest and related uncertainty can be created within minutes. flow diagnostics then instantly computes key indicators of predicted flow and storage behaviour within seconds, using simple, geologically intuitive workflows that do not require prior geomodelling expertise.
00023On DemandThe Acoustic Wavefield Generated by a Vessel Sailing on Top of a Streamer Spread
E-Lecture Recording
Stian HegnaNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEduring the acquisition of a source-over-cable survey in the barents sea, part of one sail line was repeated without triggering the airgun arrays. the acoustic wavefield generated by the source vessel sailing over the streamers has been characterized from the measured direct arrivals. the image obtained after deconvolving this wavefield from the received wavefield will be presented and compared to the image obtained from an airgun source..
00024On DemandMonitoring CO2 Plumes With Mini Streamers, is There Potential?
E-Lecture Recording
Mark ThompsonNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEfuture sites for co2 storage will be subject to regulatory requirements for monitoring to assure safe storage. additionally, monitoring will be an important tool to optimize injection operations and confirm storage volumes. monitorability, cost and leakage risk assessment are all important components in designing an optimal monitoring program to prove conformance (co2 plume behaving in accordance with predictions) and containment (no leakage out of the storage complex). the potential for new technologies and ability to optimize operations were recently investigated in field trials to monitor the co2 plume at the sleipner field in the north sea using the extended high resolution (xhr) streamer concept based on the use of mini seismic streamers.
00025On DemandAnalysis of a Local Earthquake in the Arctic using a 120 km long Fibre-Optic Cable
E-Lecture Recording
Robin AndrÊ RørstadbotnenNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEusing a 120 km long fiber-optic array, with a channel spacing of 4 m, we can see interesting features along the cable length. we show how we can locate a local earthquake recorded on distributed acoustic sensing date and compare it to the locations reported by the two earthquake catalogues in norway. the ray tracing and grid search procedure used in the localization will be discussed. the simple pre-processing job, used to enhance the signal-to-noise ratio of the data as well as enhance the first-break arrivals used in the localization study, will be presented..
00026On DemandAngle Gathers from Time-Shift Extended Least-Squares Reverse-Time Migration
E-Lecture Recording
Eric DuveneckNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEi present a method for computing reflection angle gathers using time-shift extended least-squares reverse-time migration. the method is aimed at producing image gathers that can be interpreted in terms of angle-dependent reflection coefficients, also under complex overburdens. it is based on a two-step procedure involving an iterative inversion to estimate a time-shift extended representation of the subsurface reflectivity, followed by a transform of this reflectivity to the reflection angle domain. using a formulation in terms of time-shift extended imaging allows to naturally handle complex wave-field effects like multi-pathing. the main building blocks of the method include an adjoint pair of time-shift extended linearized modelling and imaging operators, an effective time-shift extended-domain preconditioner and a transform from the time-shift domain to the reflection angle domain that properly handles amplitudes. the method is demonstrated on a synthetic data example.
00027On DemandAI Seismic Interpretation of Vintage Seismic Data With Implications for CCS Site Characterisation
E-Lecture Recording
Ryan WilliamsNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEcarbon capture utilisation and storage (ccus) is seen as a potential solution to the world’s climate/carbon crisis. around the world potential ccus sites have been identified for co2 storage, whether it be an abandoned hydrocarbon field or a subsurface aquifer. the southern north sea is thought to contain several highly prospective sites. un-faulted, anticlinal mounds of bunter sandstone aquifer/ reservoir material formed from underlying salt pillowing is overlain by triassic shales, forming a reliable trap and seal pairing. the presence of the esmond gas field supports the ability of these formations to trap and store fluids within the subsurface. using ai networks, it has been possible to investigate and interpret a southern north sea bunter mound, for identification of a ccus site location. revealing the presence of faults within the site’s location is of vital importance for, not only for sealing potential and trap definition, but also to identify any aquifer compartmentalisation which may reduce the ability to successfully fill the structure. the ai fault detection network can also be fine-tuned to the specific style of faulting observed within the seismic volume. extracting horizons from seismic data can be a time-consuming process, especially with complex faulting. therefore, having the ability to extract every horizon within a volume can free up a significant portion of an interpreter’s time, allowing them to concentrate in areas of complexity. extracting all horizons will allow an interpreter to clearly visualise the structure and the lateral extents of aquifer/reservoir and seal pair with greater confidence. combining the structural and stratigraphic analysis generated using ai allows for a quicker/ time efficient interpretation without and loss of accuracy. the ability to create quick, reliable, and consistent interpretation is key for successful ccus site investigation. it is vital that the interpreter is involved throughout the ai interpretation process, as they have all the necessary experience, knowledge and skills. ai allows the interpreter to complete the work, whilst saving time and improve the quality of results.
00028On DemandMulti-Wave and Full-Waveform Inversion in Southern Oman
E-Lecture Recording
Sylvain MascletNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEwith a shallow anhydrite layer, strong multiples and converted wave contamination, southern oman represents a technical challenge for land velocity model building and imaging. while acoustic land full-waveform inversion (fwi) has proved successful on new broadband datasets in northern oman, no successful application has been reported for southern oman. we show here that the challenge of acoustic fwi in south oman can be overcome using a dedicated workflow combining multi-wave inversion (mwi) and multi-dimensional optimal transport fwi (multid ot-fwi). the key component of the workflow is the very near surface characterization provided by surface wave dispersion curves, which allows delineation of the rus layer in the initial fwi model. multid ot-fwi is then used to mitigate amplitude issues in the presence of short period multiples and reduce cycle skipping beyond the depth of penetration of diving waves.
00029On DemandOn the Robustness of Sparsity-Promoting Regularized Wavefield Inversion with Phase Retrieval Against Sparse Long-Offset Acquisitions
E-Lecture Recording
Hossein AghamiryNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEultra-long offset node acquisitions are beneficial for full waveform inversion (fwi) because the wide variety of wave types recorded by these geometries are suitable for broadband velocity model building. however, long propagation distances induced by long offsets exacerbate cycle skipping and the sparsity of the acquisition can inject wraparound artifacts into the reconstructed velocity model. in this presentation, we propose a fwi technology that is suitable for sparse long-offset obn acquisition. cycle skipping is mitigated through anextended search space in the framework of augmented lagrangian and alternating direction method of multipliers (admm). also, the robustness of the method for sparse acquisition is achieved with phase retrieval and sparsity-promoting regularization.
00030On DemandGeochron-Based Restoration Workflow Applied to Clyde Seismic Dataset
E-Lecture Recording
Anne-Laure TertoisNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEas well as helping to understand local geology and tectonic processes, structural restoration can help validate interpretations. in 1969, dahlstrom laid out the ground rules for cross section restoration in the marginal part of an orogenic belt, believing that a cross section built according to those rules, so that it is possible to restore it, is likely to be more accurate than a cross section that fails the restoration test. numerical modelling has improved over these first pen-and-paper efforts and cross sections, three-dimensional surfaces and full three-dimensional structural models can now be restored, with direct benefits on model consistency. mechanical restoration requires grids that conform to geological structures, which can be difficult to build. using an implicit representation for horizons relieves constraints on the mesh required by finite-element methods and enables mechanical restoration of complex structures. making full use of the implicit approach, the (u,v,t) space defined by the geochron framework provides a glimpse of geological structures as they were deposited but does not map the geological space to a true deposition space as the vertical dimension is a geological time, not deposition depth. in this lecture, we present a full adaptation of the mathematical geochron framework which enables three-dimensional restoration of complex structural models with no need for user input. our new equations provide mathematically sound solutions illustrated by sequential restoration of an extensional sandbox model. the benefits of working in a restored space are then shown by applying our restoration method to a complex structural framework. using this transformation, any geological object can be converted from the present-day space to a restored state at a given time, where constraints set on the transformation ensure that the restored geological model is valid. restoring models can help assess their validity and can make further interpretation easier by cancelling the effects of faulting and folding.
00031On DemandCOFII – Open-source Julia Language Framework for Seismic Inversion
E-Lecture Recording
John WashbourneNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEwe present the chevron optimization framework for imaging and inversion (cofii), an open-source framework for seismic modeling and inversion written in the julia language that is designed to be easy to use in both cloud and traditional high performance computing environments. a primary objective is to foster an environment where academia and industry can easily collaborate on geophysical problems requiring high performance applications, and the package has been designed to allow interoperability with other julia language tools. the cofii framework enables easy testing of new ideas at production scale by defining interfaces for nonlinear and linear operators. with cofii “the math is the api”, and we show how composition of chains of simple operators can implement complex workflows. we demonstrate how cofii includes the tools needed for high-performance finite difference modeling, full waveform inversion, and reverse time migration, and describe how simple adaptation enables the framework to operate in the microsoft azure cloud.
00032On DemandRock Physics Analysis of Volcanic Lava Flows and Hyaloclastites
E-Lecture Recording
Per AvsethNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEa study is conducted to investigate the rock physics properties of volcanic facies from available core measurements from iceland and hawaii. the main goal is to investigate the rock physics properties of a set of volcanic rock samples, and to establish predictive rock physics templates for these rocks, as a function of facies and rock texture, fluids and minerology. we focus on lava flows and hyaloclastites from iceland and hawaii. we find that both these facies can be modelled using modified hashin-shtrikman upper elastic bounds, and we create rock-physics templates for varying porosity and fluid saturations. dry or gas-filled hyaloclastite facies plots with low acoustic impedances and low vp/vs ratios and are nicely separated from brine-filled hyaloclastites. dry and wet high-porosity/high-permeability vesicular lavas will have similar ai and vp/vs values, and therefore these rocks will be more difficult to discriminate seismically.
00033On DemandFWI Imaging: Unlock Unprecedented Seismic Resolution
E-Lecture Recording
Zhiyuan WeiNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEa high-resolution seismic image is of great importance to exploration and production many ways, such as bypassing drilling hazards and identifying compartmentalized reservoirs. to achieve seismic resolution as high as possible, the conventional seismic imaging process takes a piecemeal approach to deal with one or a few specific issues at a time, such as noise and multiple attenuation, source and receiver deghosting, velocity errors, illumination holes, and migration swings. full-waveform inversion (fwi) imaging models and uses the full-wavefield data, including primaries and multiples (ghost included) and reflection and transmission waves, to iteratively invert for the reflectivity together with velocity and thus is an elegant solution to resolve those issues in one (iterative) inversion. fwi imaging has proven to be a superior method for providing seismic images of greatly improved illumination, s/n, focusing, and thus better resolution, over conventional imaging methods. we demonstrate with a towed streamer data set and an obn data set that fwi imaging with a frequency close to the temporal resolution limit of seismic data (100 hz or higher) can provide seismic images of unprecedented resolution from the recorded seismic data, which has been impossible to achieve with conventional imaging methods.
00034On DemandActive and Passive 3D Seismic Survey Around the Scrovegni Chapel Using Autonomous Nodes
E-Lecture Recording
Ilaria BaroneNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture shows how to perform preliminary analyses of passive seismic data, in order to assess their characteristics: noise source distribution, time variability, frequency content, etc. a processing sequence to extract virtual source gathers from continuous passive records is shown, which is effective in overcoming the noise directionality issue. results obtained using a small-scale dense 3d dataset, acquired for archaeological prospection around the scrovegni chapel in padua (italy), demonstrate the potential of passive seismic interferometry in very complex environments such as urban areas.
00035On DemandComparing predicted and actual reservoir properties and performance of geothermal projects in the Slochteren Formation, the Netherlands
E-Lecture Recording
Lara BorstNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEa trend seen in many geothermal projects in the netherlands is that the thermal power of a finalised project is different than expected beforehand. to understand where this comes from, we have compared the forecasted and actual reservoir parameters and performance of several geothermal projects in the slochteren formation. this provided us with insights on what parameters cause this mismatch, leading to improvements that can be done to the feasibility method to more correctly estimate the thermal power of a geothermal project. in this lecture we will share our lessons learnt with you.
00036On DemandSeismic Monitoring of the United Downs Deep Geothermal Power Project (UDDGP) Site with Public Seismic Networks
E-Lecture Recording
German RodriguezNew E-lecturesE-Lecture RecordingOn DemandOn DemandEAGEthe uddgp located near redruth, cornwall, uk, consists of two adjacent deviated wells drilled in a hot granitic formation at depths of 5275 and 2329 metres, and intersecting the porthtowan fault zone to allow a natural hydraulic communication between the wells. shortly after flow-testing operations began in august 2020, a series of induced seismic events, with a maximum magnitude of 1.7 and a maximum intensity level 3 (i.e., weak vibrations) have occurred. although these magnitude and intensity levels don’t represent significant seismic hazard to local communities or infrastructure, it’s important to have a detailed characterization of the microseismicity associated with operational wells to better understand the geomechanical processes associated with injection, and to assess the likelihood of continued operations leading to the occurrence of higher magnitude induced events. we utilize publicly-available data from stations within 20 km of the uddgp site, including one bgs national network station and eight raspberry shake stations with short-period, vertical geophones, to relocate the epicentres of the induced events reported by the bgs, and to extract the focal mechanism of the highest-magnitude events. we then use the observed event magnitudes to forecast expected event magnitudes should induced seismicity continue to be generated at the site.
00037On DemandIn Pursuit of Increased Seismic Resolution while preserving Amplitude Fidelity
E-Lecture Recording
Joseph ReillySeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEin this eage e-lecture: advances in acquisition and processing technology are an enabler for improving the resolution of our seismic images. however, care must be taken to ensure these imaging enhancements retain the amplitude fidelity necessary to allow for accurate reservoir identification and characterization; including detailed avo/dhi analysis. acquisition, processing and interpretation all play important and interrelated roles in obtaining the maximum utility from the seismic data. in this electure we will discuss where resolution and data fidelity can be gained or lost, what factors primarily determine bandwidth recovery, and what decisions still need to be made in a somewhat subjective, target oriented manner. in the presentation data from the guyana marine deepwater environment will be used to demonstrate fundamental principles and the evolution of acquisition and processing workflows over the history of this project. finally, we will suggest areas where additional improvements can be achieved in seismic field technologies, processing and interpretations workflows.
00038On DemandFull Waveform Inversion of Love Waves in Anisotropic Media
E-Lecture Recording
ValĂŠrie KrampeE-Lecture RecordingOn DemandOn DemandEAGEthis eage e-lecture: "full waveform inversion of love waves in anisotropic media" (valĂŠrie krampe, eth zĂźrich), deals with the integration of vertical transverse isotropy in seismic full waveform inversion. vertical transverse isotropy is a type of anisotropy that is typical for horizontally layered sediments. our focus lies on near-surface applications of full waveform inversion, where the wavefield is dominated by surface waves. by inverting only the sh-component of the seismic data, the inverse problem is reduced to three independent parameters, namely the vertical and horizontal s-wave velocities and density. with numerical examples, we show that the two velocity models can accurately be resolved by full waveform inversion. in comparison to an isotropic inversion, a more comprehensive subsurface model can be obtained, which allows a better characterization of shallow anisotropic media.
00039On DemandAutomated top and base salt interpretation using machine learning
E-Lecture Recording
Oddgeir GramstadData ScienceMachine LearningE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture: "automated top and base salt interpretation using machine learning" describes a new automated workflow based on machine learning which can significantly reduce the amount of manual interpretation of the top and the base salt boundaries. manual interpretation of salt boundaries on large seismic surveys with complex salt geometry is a time-consuming task. the interpreters typically need to scan through the seismic volume and pick surface control points line-by-line. it can take more than a month to complete a top or a base of salt interpretation. in this new method, two convolutional neural nets are designed to detect the top and the base of salt boundaries and the training data are picked as 2d images on two manual interpretations in a specific seismic survey. the trained networks are then evaluated both on the seismic data used in the training and on another seismic data not used in the training. in both cases we can produce a top and base salt interpretation that covers the main parts of the corresponding manual interpretations. the results can be further improved by adding more training data. this new automated workflow has the potential to reduce the interpretation turnaround time of both top and base of salt from approximately a month or more and down to hours.
00040On DemandAssessing the link between EMI data and hydrocarbon pollution at a former refinery site
E-Lecture Recording
Luis Cavalcante FragaNear SurfaceNon-seismic MethodsE-Lecture RecordingOn DemandOn DemandEAGEthis eage e-lecture: "assessing the link between emi data and hydrocarbon pollution at a former refinery site" brownfield redevelopment is an answer to create potential building areas inside cities and avoid urban sprawl. however, soils and groundwater in place have often been contaminated by former activities. environmental assessments (ea) are thus necessary to characterize and estimate the contaminated volume of soils and the site rehabilitation cost. nevertheless, classical investigation techniques (boreholes, piezometers, sample analysis) can only provide punctual observations and are cost and time intensive. electromagnetic induction (emi) methods in the frequency domain can complement these investigations and map electromagnetic soil properties (soil-apparent electrical conductivity and in-phase component) in a quasi-continuous way at a site scale. linking these indirect geophysical properties to the soil chemical analysis through a geostatistical modelling could provide a better quantification of the pollution source and its spreading. besides, the effect of urban emi noises from urban utilities (transmission wires, underground cables and structures…) must be assessed for a successful data fusion. to evaluate the feasibility of this geophysical-geochemical-geostatistical approach, we present the first results of a study conducted over a 3 000 m² brownfield site.
00041On DemandJoint VP and VS Monte Carlo Inversion from Surface Wave Data
E-Lecture Recording
Farbod AnjomSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEthis eage e-lecture: "joint vp and vs monte carlo inversion from surface wave data" in common seismic surface wave methods, the surface wave dispersion curve is exploited to estimate the s-wave velocity (vs) model. since the dispersion curve is poorly sensitive to p-wave velocity (vp), the vp models usually are not the target of these methods. recently, the concept of the wavelength-depth (w/d) relationship, which is proven to be sensitive to both vs and vp, has been introduced. the joint inversion method presented in this e-lecture considers both surface wave dispersion curve and w/d relationship to estimate high-resolution vs and vp models. the method’s application to a field data set from a controlled site is shown, and the estimated vs and vp models are compared with benchmark values.
00042On DemandPermeability prediction from Induced Polarization at field scale
E-Lecture Recording
Gianluca FiandacaNear SurfaceNon-seismic MethodsE-Lecture RecordingOn DemandOn DemandEAGEin this eage e-lecture: “permeability prediction from induced polarization data at field scale” we present the estimation of intrinsic permeability from time-domain spectral induced polarization (ip) data, measured in boreholes and along 2d surface profiles. the mapping of intrinsic permeability (k), which is a measure of the ability of a porous medium to allow fluids to pass through it, is the holy grail of hydrogeophysics, but it has eluded attempts of resolution in the past. in this study full-decay ip data were inverted in terms of a re-parameterization of the cole-cole model, which present smaller parameter correlations and disentangles bulk and surface conduction. permeability values were computed from bulk conductivity and the maximum imaginary conductivity, using the empirically-derived formulae presented in a recent study without any calibration. the ip-derived k estimates, obtained from data acquired along sixteen 2d surface profiles and three boreholes on unconsolidated formations, were compared to those estimated using grain size analysis and slug tests, for a total of 157 comparisons. a good correlation, on average within one decade, was found between the k estimates over four orders of magnitude, with similar depth-trends. in conclusion, ip can be reliably used for estimating permeability on unconsolidated formations at the field scale, using the relations found in the laboratory without any further calibration.
00043On DemandSeafloor Massive Sulfide Eploration - A New Field of Activity for Marine Electromagnetics
E-Lecture Recording
Hendrik MullerExplorationSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEseafloor massive sulfides (sms) are modern equivalents of vms deposits in the deep ocean and likely become significant sources for base and precious metal supply in the near future. electrical and electromagnetic (em) methods have shown success in locating sulfide ore deposits. however, system operation in rough mid-ocean ridge topography and data interpretation of marine polymetallic sulfides is still challenging. we present a new marine em instrument together with an integrated geophysical mapping approach for resource assessment and subsurface classification, correlating field em data with petrophysical and geochemical analysis. results provide first insights into the subsurface architecture of active and extinct sulfide ore deposits on central indian ridge and demonstrate the efficiency of this new method for deep-sea mineral exploration.
00044On DemandFeasibility of 3D random seismic arrays for subsurface characterizations in urban environments
E-Lecture Recording
Bojan BrodicSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEin this eage e-lecture: "feasibility of 3d random seismic arrays for subsurface characterizations in urban environments" evaluates the feasibility of random - jittered seismic sampling for active and passive seismic imaging of potential contaminant migration pathways in urban environments. by using datasets acquired at a contaminated site in varberg city in southern sweden, bojan brodic compares the tomographically obtained velocity models from active-source jittered array versus conventional 2d landstreamer seismic data acquisition. apart from the active-source part, the ambient noise recorded on the random seismic array is used further for retrieval of the green's functions with surface waves successfully obtained. the processes and steps necessary for both active-source and passive seismic analyses are explained in an illustrative and easily understandable manner. the results show that the jittered seismic sampling shows advantages over conventional 2d landstreamer seismic by providing 3d velocity model of the bedrock surface and it's undulations that are used as contamination migration pathways and potential of the random seismic array for ambient noise studies.
00045On DemandSeismic Attenuation: Friend or Foe
E-Lecture Recording
Mark VardySeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEin this eage e-lecture: "seismic attenuation: friend or foe", we assess the role of attenuation in marine near surface seismic reflection data sets and discuss whether it is a potentially useful property for quantitative characterisation of the subsurface. the basic theory of intrinsic attenuation is briefly outlined, introducing the seismic quality factor (q-factor) parameter. we show several methods that can be used to make estimates of the subsurface q-factor from single-channel or short-offset seismic reflection data and how basic data quality can be improved by compensating for attenuation. moreover, we look at how variations in q-factor reflect changing ground conditions, demonstrating a strong link with sediment lithology and drained versus undrain soil mechanical behaviour. by combining q-factor estimates with more standard geophysical parameters (p-wave velocity and/or impedance) we illustrate how fundamental ground conditions can be inferred using geophysical data alone. as such, we suggest that attenuation should be considered a useful quantitative parameter, alongside reflection amplitude, phase and frequency.
00046On DemandMETIS, a field-proof innovative method to revolutionize onshore seismic acquisition
E-Lecture Recording
Bruno PagliacciaSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEin this eage e-lecture: "metis, a field-proof innovative method to revolutionize onshore seismic acquisition": metis (multiphysics exploration technology integrated system) is an randd project aimed to make seismic acquisition 4.0 a reality. from logistics to real-time data qc, the entire process has been redesigned with an holistic approach. an hybrid airship to replace helicopter, wireless/real-time/biodegradable sensors to automatize data acquisition and a command and control center to operate the system from the base camp. all these elements will allow low-cost, safe and efficient seismic operations in hard-to-reach places like the tropical rainforest of papua new guinea (png). end of 2017, the main technological bricks have been tested on prl 15 concession, located onshore png, with a demonstration pilot where more than 60 darts were successfully dropped from a drone, through the canopy, to the ground with a good coupling. after few shots made with a mud-gun, real-time data acquisition has been validated in one of the most challenging environment to acquire seismic data. this first step is paving the way to the next pilot where a full 3d seismic volume will be acquired after thousands of sensors dropped by an autonomous swarm of drones.
00047On DemandNear surface geophysics for engineering
Student E-Lecture Recording
George TuckwellNear SurfaceNon-seismic MethodsE-Lecture RecordingOn DemandOn DemandEAGEnear surface geophysics for engineering: information vs risk", geophysical techniques are just a part of the full toolbox available for ground investigation in engineering and construction projects. using geophysics at the right time in the right way requires an understanding of the information each instrument produces, and how this relates to what is produced by other options, for example digging or drilling holes. the requirements of a geotechnical or geoenvironmental ground investigation are best stated as a requirement to reduce risk of unforeseen ground conditions to an acceptable level. what an acceptable level is depends on the site, the project, and the client’s informed attitude to risk. as a result of some ground investigation effort (and cost) what do you know, and what do you still not know? the talk will explore these concepts, and use case examples to demonstrate where geophysical techniques are most useful.
00048On DemandFWI with Optimal Transport: a 3D Implementation and an Application on a Field Dataset
E-Lecture Recording
Jeremie MessudE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture: "fwi with optimal transport: a 3d implementation and an application on a field dataset", we present the application to a 3d real dataset of full waveform inversion (fwi) with optimal transport (ot) using the kantorovich-rubinstein (kr) distance as proposed by mĂŠtivier et al. (2016). this approach involves an efficient numerical implementation for ot in time and space directions, allowing the lateral coherency of the traces to be taken into account; this has an important impact on the quality of the results. the approach also exhibits a reduced sensitivity to local minima compared to least squares (lsq) misfit. moreover the iterative method used for the computation of the kr distance allows the production of a set of intermediary solutions that span progressively from lsq to ot. we recall the main components of the approach and present its numerical implementation in 3d. we show the improvement of the results compared to lsq fwi on real datasets.
00049On DemandQuantitative prediction of injected CO2 at Sleipner using wave-equation based AVO
E-Lecture Recording
Peter HaffingerReservoir CharacterizationE-Lecture RecordingOn DemandOn DemandEAGEin this eage e-lecture: "quantitative prediction of injected co2 at sleipner using wave-equation based avo", wave-equation based amplitude-versus-offset inversion is a fundamentally new approach towards converting seismic pre-stack data into elastic subsurface properties. by solving the full elastic wave-equation, the routinely made assumption of a linear relationship between seismic amplitudes and reservoir properties is overcome. as a consequence interbed multiples, mode conversions and transmission effects over the inversion interval are properly accounted for. additionally, the method directly solves for compressibility and shear compliance, which are approximately three times more sensitive to fluid and lithology changes when compared to impedances. this makes the technology suitable for quantitative interpretation even in geologically highly complex scenarios. in this e-lecture, a high level introduction to wave-equation based avo inversion will be given and an application to the sleipner carbon capture and storage (ccs) project will be presented.
00050On DemandStructural Dip, Migration and Quantitative Interpretation
E-Lecture Recording
Ehsan Z. NaeiniE-Lecture RecordingOn DemandOn DemandEAGEit is relatively well known that migration stretches the waveforms of dipping reflections. it is less well known how this impacts quantitative interpretation of the data where, at the heart of such workflows, the seismic is tied to the well and subsequently inverted to obtain acoustic and/or elastic properties. it is shown here how migration stretch distorts well tie, coloured inversion, and model-based inversion. a post migration first-order zero-offset deconvolution is introduced to remedy this drawback, and the result is demonstrated on a synthetic and a reverse time migrated image. finally, it is argued that full-waveform inversion would inherently handle the dips without any need for stretch correction. (references: cherrett 2013 and naeini 2018).
00051On DemandDepth Domain Inversion: a Least-squares Migration Approach to Quantitative Interpretation
E-Lecture Recording
Claudio LeoneE-Lecture RecordingOn DemandOn DemandEAGEqi workflows assume that seismic amplitudes are only linked to contrasts in rock properties, and that other wave propagation effects such as illumination, absorption, etc. have been addressed during seismic data processing and imaging. this assumption is often not met. the consequence is that 1d wavelets can’t adequately relate seismic amplitudes to reflectivity contrasts, and conventional time-domain inversion approaches inevitably struggle to accurately estimate the elastic rock properties. the effects of irregular illumination can be modelled by point spread functions (psfs), and removed from the seismic image with an inversion directly in the depth domain (fletcher et at., 2012). this technique, called depth domain inversion (ddi), improves imaging and inversion results by correcting for the effects of irregular illumination caused by the geological structure and overburden velocity variations. a north sea case study is presented where ddi is enhances amplitude fidelity and resolution beneath cemented sand injectites.
00052On DemandCracking Open the Black Box
Student E-Lecture Recording
Jesper SĂśren DramschArtificial Intelligence and Data AnalysisMachine LearningE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture: "cracking open the black box - making sense of machine learning and neural networks", machine learning in geoscience has made a strong return recently, being applied across all disciplines in geoscience. in this presentation jesper dramsch presents the basic concepts of machine learning and goes into detail why it is so popular. they then go on to explain how it is applied and how we can gain scientific insights from these blackbox models and start including domain knowledge and physical properties in these machine learning systems.
00053On DemandMaking the Transition from Discrete shot Records to Continuous Wavefields – Data Examples
E-Lecture Recording
Tilman KluverSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture: a novel seismic acquisition and processing methodology is demonstrated. the method retrieves the response of the earth from data acquired with continuous source and receiver wavefields. the ideal source wavefield would be band-limited white noise. ways of generating a source wavefield which approaches the properties of white noise using existing air-gun equipment will be discussed using real data examples. seismic data acquired by triggering individual air-guns with short randomized time intervals in a near continuous fashion will be compared to seismic data acquired with large source arrays triggered every 25m. the continuous source wavefield improves the sampling of common-receiver gathers compared to conventional acquisition methods. spreading the source energy out in time results in reduced peak sound pressure levels with the new method.
00054On DemandMaking the transition from discrete shot records to continuous wavefields - Methodology
E-Lecture Recording
Stian HegnaSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEin this presentation a novel seismic method is introduced. the method utilizes continuous wavefields on both the source side and on the receiver side. it requires continuous seismic recording, and a continuous or near continuous source wavefield approaching the properties of band-limited white noise. the main operational benefits are reduced environmental impact of marine seismic sources, and potentially improved acquisition efficiency. the main geophysical benefit is improved spatial sampling on the source side both inline and potentially cross-line
00055On DemandIncreasing Acquisition Efficiency by Acquisition of Data During Turns, Using a Multimeasurement Streamer
E-Lecture Recording
Sneha BiswasSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture sneha biswas talks about the ability of multi-measurement streamers in conjunction with the acquisition of data during turns for an efficient marine seismic acquisition. acquiring data during turns is an approach to improve productivity of marine seismic surveys. data results post noise attenuation compares the quality of this data against straight line acquisition and demonstrates the usability of this turn data.
00056On DemandReservoir Elastic Parameters Estimation from Surface Seismic Data using JMI-res: A Full-Wavefield Approach
E-Lecture Recording
Aayush GargE-Lecture RecordingOn DemandOn DemandEAGEtraditionally, reservoir elastic parameters inversion suffers from the unaccounted overburden multiple scattering and transmission imprint in the local input data used for the target-oriented inversion. in this e-lecture, we present a full-wavefield approach, called reservoir-oriented joint migration inversion (jmi-res), to estimate the high-resolution reservoir elastic parameters from surface seismic data. in the jmi-res, we reconstruct the fully redatumed virtual source-receiver data (local impulse responses) within the earth subsurface, while correctly accounting for the overburden internal multiples and transmission losses. then, we apply a localized elastic full waveform inversion on the local impulse responses to get the elastic parameters. we show that jmi-res provides much more reliable local target impulse responses, thus yielding high-resolution elastic parameters, compared to a standard redatuming procedure based on time reversal of data. moreover, this approach avoids the need to go full elastic for the whole subsurface, as within jmi-res elastic full waveform inversion is only restricted to the reservoir target domain.
00057On DemandTriple-Source Simultaneous Shooting, a Future for Higher Density Seismic
E-Lecture Recording
Jan LanghammerSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEjan langhammer’s e-lecture has the following subject: reducing the crossline bin-size in marine seismic streamer exploration can be performed by using more sources without compromising the efficiency of the operation. triple-source in marine seismic streamer acquisition has been tested in the past, but with limited commercial success compared to dual-source acquisition. with the introduction of new and better low noise streamers, in addition to the ability to record and deblend simultaneous source data, it is time to revisit the use of triple-sources in marine seismic exploration for decreased crossline bin-size leading to better spatial resolution. a triple-source configuration can find its application in shallow and deeper water areas for imaging of targets where reduced crossline spacing and higher fold may be required
00058On DemandImproved Rock Property Estimation from Joint Inversion of PP and PS Reflectivities
E-Lecture Recording
Ivan LehockiRock PhysicsRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture: "improved rock property estimation from joint inversion of pp and ps reflectivities". the objective of this work was to develop a method for joint inversion of pp and ps data with the goal of unique and accurate determination of important layer parameters, namely y1 and y2 ratios. the method also gives reliable estimates of density ratio, a parameter that can be directly linked to hydrocarbon saturations. the usage of the method is limited to the assumptions used in the derivation of zoeppritz’s equations, i.e. interface of two horizontal, homogeneous, isotropic, elastic layers. what is new? easy to understand approach for inversion of all four elastic parameters entering zoeppritz equations.
00059On DemandSedimentology and Reservoir Properties of Chalk
Student E-Lecture Recording
John D. HumphreyReservoir CharacterizationRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEthis eage student e-lecture discusses general sedimentological characteristics of chalks and their potential as both conventional and unconventional hydrocarbon reservoirs. the principal focus is on the controls on sedimentation of these economically significant, fine-grained pelagic carbonate rocks.
00060On DemandGiant Regional Play Fairways from Modern Seismic Data - part 2
E-Lecture Recording
Neil Hodgson and Karyna RodriguezStructural GeologyStructural GeologyE-Lecture RecordingOn DemandOn DemandEAGEsecond part of the e-lecture “giant play fairways are play fairways for giants”. recent developments in exploration ideas: imaging pre-salt syn-rift clastics in gabon to inorganic carbonate deposition in the santos basin of brazil, from basin floor contourite – turbidite mixed clastic systems of the south atlantic, isolated carbonate build-ups in somalia and guyana, conjugate margins drawn together and understood in a dynamic topography framework, and illustrated with modern seismic examples.
00061On DemandGiant Regional Play Fairways from Modern Seismic Data - part 1
E-Lecture Recording
Neil Hodgson and Karyna RodriguezStructural GeologyStructural GeologyE-Lecture RecordingOn DemandOn DemandEAGEfirst part of the e-lecture “giant play fairways are play fairways for giants”. recent developments in exploration ideas: imaging pre-salt syn-rift clastics in gabon to inorganic carbonate deposition in the santos basin of brazil, from basin floor contourite – turbidite mixed clastic systems of the south atlantic, isolated carbonate build-ups in somalia and guyana, conjugate margins drawn together and understood in a dynamic topography framework, and illustrated with modern seismic examples.
00062On DemandExploration Discoveries and Future Trends
E-Lecture Recording
Andrew LathamExplorationSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEthe oil and gas exploration industry has fixed its broken economics and emerged from the recent oil price downturn in good health. but the industry is now much smaller, with fewer companies drilling fewer wells. new field volumes discovered have fallen to 70-year lows. new plays and frontiers are often at the heart of the improved profitability. companies that are prepared to take greater exploration risks are reaping greater rewards. this e-lecture reviews some of the most important new discoveries behind these trends, and considers the future outlook for the sector.
00063On DemandUsing Digital Music Technology for Geophysical Data Analysis and Interpretation
E-Lecture Recording
Paolo Dell'AversanaSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture dell’aversana discusses how digital music technology can support geophysical data analysis and interpretation: we apply accurate mathematical transforms for extracting the spectrograms of geophysical data, such as seismic, electromagnetic and gravity data, well logs and so forth. then, the spectrograms are translated into sounds in standard musical formats and are imported into a software platform of digital music. we apply two complementary workflows to our converted “geo-musical” data: first, we use musical pattern recognition algorithms for automatic data mining and classification; second, we use interactive audio-video display in selected portions of the data set for allowing multisensory perception and advanced cognition. during the e-lecture we introduce the fundamentals of the approach. finally we show some applications to real data.
00064On DemandMaximising the Benefits of Full Waveform Inversion
E-Lecture Recording
Fabio ManciniSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEfull-waveform inversion relies on accurate starting models to avoid local minima. we remove this reliance by solving an augmented wave equation, designed to fit the data as well as the physics, in combination with imposing constraints. as a result we end up with an inversion scheme that produces good results in situations where conventional full-waveform inversion is known to fail.
00065On DemandA New Take On FWI: Wavefield-Reconstruction Inversion
E-Lecture Recording
Felix HerrmannSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEfull-waveform inversion relies on accurate starting models to avoid local minima. we remove this reliance by solving an augmented wave equation, designed to fit the data as well as the physics, in combination with imposing constraints. as a result we end up with an inversion scheme that produces good results in situations where conventional full-waveform inversion is known to fail. did you like this e-lecture? learn here how to request a webinar with felix herrmann.
00066On DemandSeismic Spatial Gradient Measurements
E-Lecture Recording
Nihed el AlloucheNear SurfaceNon-seismic MethodsE-Lecture RecordingOn DemandOn DemandEAGErotation measurements have found applications in various fields of geophysics ranging from near-surface archaeological mapping to large scale upper mantle tomographic inversion. in the absence of a cost-effective sensor sensitive over the typical seismic frequency bandwidth, rotation measurement can be approximated by finite-differencing the response of the vertical particle velocity over a short distance. accurate estimates of the horizontal gradient of the vertical wavefield can be obtained when perturbations associated with the measurement are minimised. these perturbations can be sensor related, for example geophone sensitivity and natural frequency, and/or deployment related such as tilt and coupling errors. in this e-lecture, we show how perturbations can affect the gradient measurement (the tilt error turns out to be dominant) and discuss the minimum receiver spacing required to avoid the impact of perturbations dominating the gradient estimates. we also discuss a “sensitivity” chart ranking the perturbations according to impact and indicate which one of these needs to be minimised in order to obtain reliable gradient estimates.
00067On DemandA 2nd-order Adjoint Truncated Newton Approach to Time-domain Multiparameter Full Waveform Inversion in Viscoacoustic Medium
E-Lecture Recording
Pegliang YangSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture introduces a 2nd-order adjoint truncated newton approach to time-domain multiparameter full waveform inversion in viscoacoustic medium. a truncated newton method for time-domain full waveform inversion in visco-acoustic medium is developed using 2nd-order adjoint state formulation. time-domain gradient and hessian-vector product are built by recomputing the incident and adjoint wavefields. after the design of an efficient preconditioner, the importance of the inverse hessian for mitigating inter-parameter trade-off is validated on a toy example. a realistic 2d synthetic mimicking north-sea real data application demonstrates that considering hessian influence significantly improves the multi-parameter reconstruction, for a reasonable increase of the computational cost compared to standard quasi-newton method.
00068On DemandTheory for Marchenko Imaging of Marine Seismic Data with Free Surface Multiple Elimination
E-Lecture Recording
Evert SlobSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture: theory for marchenko imaging of marine seismic data with free surface multiple elimination; introduces the theory for reflector imaging from marine seismic data that include ghosts, free surface and internal multiple reflections. first, we look at building the necessary redatuming operators from the data when the free surface would not be present. the redatuming operators are found as the focusing functions that are not influenced by the presence or absence of the free surface. next, a matrix equation is found from which the focusing functions are computed using the measured data decomposition into up- and downgoing waves. no other processing steps are required. the scheme does not need information about the source time signature or the actual character of the free surface. a macro-model is necessary to construct an estimate of the direct part of the focusing function. the ghost, free surface and internal multiple reflections do not create false images and an artefact free image is obtained.
00069On DemandVirtual Seismology: monitoring the subsurface with virtual sources and receivers
E-Lecture Recording
Kees WapenaarSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture introduces virtual seismology: monitoring the subsurface with virtual sources and receivers, which is a new methodology to create virtual sources and virtual receivers in the subsurface from reflection measurements at the earth's surface. unlike in seismic interferometry, no physical instrument (receiver or source) is needed at the position of the virtual source or receiver. moreover, no detailed knowledge of the subsurface parameters and structures is required: a smooth velocity model suffices. yet, the responses to the virtual sources, observed by the virtual receivers, fully account for multiple scattering. this method is not only useful for reflection imaging but is has also large potential for monitoring induced seismicity, characterizing the source properties and forecasting the response to potential future induced earthquakes. this will be demonstrated with numerical models and preliminary real-data results.
00070On DemandChalk Porosity and Diagenesis
Student E-Lecture Recording
John D. HumphreyReservoir CharacterizationRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEthis eage e-lecture discusses diagenesis (post-depositional modification) of chalks and its effect on porosity evolution and reservoir quality. the principal focus is on the physical and chemical processes, as a function of burial, that alter these economically significant, fine-grained pelagic carbonate rocks.
00071On DemandBedrock and Fracture Zone Delineation Using Different Near-Surface Seismic Sources
E-Lecture Recording
Bojan BrodicNear SurfaceNon-seismic MethodsE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture "bedrock and fracture zone delineation using different near-surface seismic sources" discusses a seismic survey conducted using four different small-scale and inexpensive seismic sources to delineate bedrock surface and a fracture zone intersected by a well at c. 50 m depth. the seismic sources analyzed are a 5-kg sledgehammer, a metal i-beam struck laterally, an accelerated weight drop and a prototype em based seismic source with two hammers striking successively at an adjustable impact rate. from the recording perspective, a high-fold (star-type) acquisition spread was designed combining a three-component microelectro-mechanical system (mems) seismic landstreamer and wireless seismic recorders. the performance of every source used is analyzed and reflection seismic sections, along with 3d tomography results shown. the results indicate well delineated undulating bedrock topography, both on tomography and seismic sections for all sources. weak reflectivity is observed where the fracture zone is expected. most of the sources used show similar potential for fracture zone and near-surface imaging and star-type seismic array used enables 3d overview of the shallow subsurface and potential for pseudo 3d reflection seismic processing.
00072On DemandCharacterization of Holocene Sediments Using Geophysical Methods and Borehole Information: Ebro Delta (Spain)
E-Lecture Recording
Beatriz BenjumeaNear SurfaceNon-seismic MethodsE-Lecture RecordingOn DemandOn DemandEAGEbeatriz benjumea shows the integration of geophysical and borehole information to characterize holocene sediments in the ebro delta (spain). nowadays, this delta coastline is retreating landward due to a combination of sediment subsidence, sea level rise and sediment deficit caused by river damming. measuring spatial changes of near-surface sediment facies is critical to evaluate subsidence. in this presentation, geophysical patterns that help to characterize the holocene sequence are extracted from borehole and geophysical information at two test sites. the applied methods are: active and passive seismic and electrical resistivity tomography (ert). these patterns are then used in an extended survey along the delta with the following targets: to discriminate between surficial sediments facies, to detect the top of the prodelta marine clays and finally to image the base of the holocene delta.
00073On DemandGeoBIM for Infrastructure Planning
E-Lecture Recording
Mats SvenssonEngineeringPetroleum EngineeringE-Lecture RecordingOn DemandOn DemandEAGEeage e-lecture: geobim for infrastructure planning by mats svensson. this e-lecture aims at bridging the gap between the deliveries from geophysicists to the infrastructure industry, so that the results from geophysics are used in the best possible way. the key to this is proper communication. for this we all need to know who all the stakeholders are and what interests, what skills and which tools do they have, and we also need to improve the tools we use. this e-lecture is trying to clarify those issues and also suggesting the powerful geobim concept to handle both data, models and communication, exemplified by a large railway project in sweden.
00074On DemandReducing project turnaround by optimizing the model building workflow using full-waveform inversion and reflection tomography: A North Sea case study
E-Lecture Recording
Shruti GuptaSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEtwo of the key challenges for velocity model building in the north sea are a heterogeneous overburden (for example, the presence of fluvial and sub-glacial channels) and the presence of strong velocity contrasts (most often introduced by a chalk layer). two model building techniques have been developed in recent years which address these challenges. full-waveform inversion (fwi) has been shown to be highly effective in resolving overburden heterogeneity and multi-layer tomography allows us to preserve sharp contrasts in our velocity models. in this eage e-lecture, we present how the combination of these two techniques provides an effective and efficient model building workflow for the north sea environment.
00075On DemandAn Iterative Workflow for Facies Modeling on the Alvheim Field, Norwegian Continental Shelf
E-Lecture Recording
Andor HjellbakkE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture, andor hjellbakk will take you through some simple but effective principles for building a deterministic facies model for the deep-marine deposited tertiary reservoir of the aker bp operated alvheim field. the facies modeling workflow is combining state-of-the-art modeling techniques with input data from 100 km of penetrated reservoir, spectral decomposition (seismic) data and impedance data. further, the datasets from the subsurface is linked to observations from outcrop data to make sure realistic depositional trends and dimensional data are used in the modeling process.
00076On DemandEfficient 3D Frequency-Domain FWI of OBC Data
E-Lecture Recording
StĂŠphane OpertoSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEwide-azimuth long-offset obc/obn surveys provide a suitable framework to perform computationally-efficient 3d frequency-domain full waveform inversion (fwi) with a few discrete frequencies. frequency-domain seismic modeling is performed efficiently with moderate computational resources for a large number of seismic sources with the sparse multifrontal direct solver mumps. the relevance and the computational efficiency of the frequency-domain fwi performed in the visco-acoustic vti approximation is shown with a real 3d obc case study from the north sea. the subsurface models built by fwi show a dramatic resolution improvement relative to the initial model built by reflection traveltime tomography down to the base cretaceous reflector below the reservoir level. the relevance of the fwi model is assessed by frequency-domain and time-domain seismic modellings and source wavelet estimation, which might reveal the footprint of attenuation on the imaging results.
00077On DemandA Novel Source-Over-Cable Solution to Address the Barents Sea Imaging Challenges
E-Lecture Recording
Per Eivind DhelieSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEthis eage e-lecture "a novel source-over-cable solution to address the barents sea imaging challenges " presents a full overview of the topseis source-over-cable solution. the challenging geologic setting in the barents sea is discussed and legacy seismic data is scrutinized in an effort to understand the fundamental challenges related to improved seismic imaging in the barents sea. the acquisition design behind the new technology is presented in detail, from the wide-towed small triple source setup to the split-spread deep towed streamers. deblending of triple sources is presented as well as a detailed overview of the challenging demultiple problem. a number of seismic image comparisons are also presented illustrating the benefit achieved with the new source-over-cable solution. the final part of the talk looks into the future and proposes possible solutions to obtaining similar acquisition setups, but using only a single vessel towing both the sources and the streamers.
00078On DemandSeismic Interpretation with Deep Learning
E-Lecture Recording
Anders U. WaldelandData ScienceMachine LearningE-Lecture RecordingOn DemandOn DemandEAGEhow and why can deep learning be used for seismic interpretation? the machine learning technique called deep learning is revolutionizing the field of computer vision. a central part of deep learning is convolutional neural networks (cnn). this e-lecture gives a simple and intuitive introduction to cnns in the context of seismic interpretation.
00079On DemandShooting over the Spread
E-Lecture Recording
Vetle VinjeSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEin this lecture, i present the motivation, the evolution and the benefits of a new marine acquisition concept developed in close cooperation between lundin and cgg over the last few years. we call the concept topseis. it addresses the lack of near-offset data recorded in conventional towed-streamer acquisition by enabling the recording of short- and zero-offset data with the seismic sources located above the streamers. in addition, topseis significantly increases the illumination density (number of times a specific depth point is recorded) for both shallow and deep targets. this benefits imaging, avo and inversion as shown by several synthetic and real examples.
00080On DemandMicroseismic Monitoring of a Tight Light Oil Reservoir
Student E-Lecture Recording
John DuhaultReservoir CharacterizationRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEthis fundamentals e-lecture investigates the effectiveness of hydraulic-fracturing completions in a tight-oil play in canada by illustrating detailed examples of the passively recorded microseismicity. the case history format enables an easy to follow interpretation on the inference of fracture wing length, height and azimuth based on event distribution on several projects. the distribution of microseismicity further shows that isolated event clusters of out-of-zone events are interpreted to have occurred on unpropped fractures. slickwater fracturing fluids, in comparison to gelled oil or foamed water, are shown to produce more diffuse and scattered microseismic expression and a higher cumulative oil production. the results of these studies indicate the value that microseismic imaging of horizontal multistage fracturing wells has on guiding future oil field development, especially in maximizing estimated ultimate recovery (eur).
00081On DemandSeismic Facies Classification Using Multimedia and Machine Learning
E-Lecture Recording
Paolo Dell'AversanaE-Lecture RecordingOn DemandOn DemandEAGEpaolo dell’aversana*1, gianluca gabbriellini1, gabriela carrasquero1, alfonso amendola1, alfonso iunio marini1 1eni s.p.a. upstream and technical services as it happens for natural intelligence, also artificial intelligence can be improved if it is able to analyze and interpret multimodal information. in this e-lecture, we show that training a computer with multimodal data, increases the possibility of seismic facies classification through machine learning algorithms. we use a new class of attributes in geophysics, representing ‘musical’ properties implicitly included in the data. together with traditional geophysical attributes, our multimedia machine learning system uses also melodic, harmonic and rhythmic patterns extracted from the data. all these new features show high classification power. in particular, they allow distinguishing low-gas from high-gas saturated sands, as showed in the real example discussed in this lecture.
00082On DemandHow to store CO2 underground
Student E-Lecture Recording
Philip RingroseCCS and DecarbonizationEnergy TransitionE-Lecture RecordingOn DemandOn DemandEAGEin this eage student e-lecture: phil ringrose from ntnu and equinor in norway gives an overview of co2 storage technology using insights from early-mover projects.
00083On DemandThe Effect of Shale Activation on the 4D Seismic Interpretation of a UKCS Field
E-Lecture Recording
Ricardo RangelE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture, ricardo rangel talks about 'the effect of shale activation on the 4d seismic interpretation of a ukcs field'. he will present a case study and then go into more depth about simulation results, as well as seismic modelling and 4d seismic response
00084On DemandThe Importance of Overburden Stress Path in Assessment of Stress Dependence for 4D Applications
E-Lecture Recording
Rune M. HoltGeomechanicsGeomechanicsE-Lecture RecordingOn DemandOn DemandEAGEthe importance of overburden stress path in assessment of stress dependence for 4d applications. in time-lapse (4d) seismic, slow-down in the overburden is often seen as a footprint of depletion in subsurface reservoirs. the work presented in this lecture has demonstrated that for stress changes around the in situ stress, laboratory measured stress and strain sensitivity of a field shale core depends strongly on the stress path. translated to the field, the stress path describes how horizontal stress varies with changes in the vertical stress when stress arching occurs above a depleted (or inflated) site. geomechanical simulations are needed in order to identify the correct in situ stress path for each specific field situation, but 4d data may also provide guidelines towards the identification of the overburden stress path.
00085On DemandCombining Machine Learning and Musical Attributes for Seismic Facies Classification
Student E-Lecture Recording
Paolo Dell'AversanaArtificial Intelligence and Data AnalysisMachine LearningE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture we introduce a comprehensive approach of automatic classification and interpretation of geophysical data based on machine learning and digital music technology. the methodology consists of two main steps. first, we convert geophysical data into midi files (musical instrument digital interface). then, we extract midi features from the converted data. these “musical features” are finally used as complementary attributes for data classification through machine learning approaches. after introducing the basic methodological aspects, we discuss examples and applications to real geophysical data.
00086On DemandA Misfit Function Based on an Optimal Transport Distance for FWI
E-Lecture Recording
Ludovic MĂŠtivierE-Lecture RecordingOn DemandOn DemandEAGEin the field of seismic imaging, full waveform inversion has become one of the key techniques to provide high resolution quantitative estimation of subsurface mechanical parameters such as wave velocities, density, attenuation, or anisotropy parameters. recent success stories have led both the academy and industry to investigate this technique. its applicability is however still limited for exploration targets, mostly because of the lack of low frequencies in the data which makes it difficult to correctly interpret the kinematic attributes of the wavefield. mitigating this issue is the motivation of the work proposed in this presentation. the strategy we present uses a new distance function between observed and calculated data, based on the optimal transport theory. this new distance provides a more convex misfit function: we show on several synthetic examples how this could help to make full waveform inversion a more robust and powerful tool.
00087On DemandMarine CSEM - Understand the quintessence
Student E-Lecture Recording
Ludovic PeignardNon-seismic MethodsNon-seismic MethodsE-Lecture RecordingOn DemandOn DemandEAGEunderstanding marine controlled source electromagnetics (mcsem), how it works and on what that relies is not that obvious due to multiple physical phenomena at stake (geometric, inductive and galvanic). in this e-lecture, ludovic peignard explains simply how electromagnetic waves are affected when diffusing in the subsurface with a very light content of theory. the idea is to put you on track to subsequently look at mcsem in more depth.
00088On DemandSimulating Correlated Discrete Fracture Networks constrained by Microseismic Data
E-Lecture Recording
François BonneauGeomechanicsGeomechanicsE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture presents a workflow to simulate correlated discrete fracture networks (dfn) constrained by statistics and microseismic data. we investigate the possibility to analyze microseismic data using the 3d hough transform and to constraint the discrete fracture network simulation. then, we detail a sequential pseudo-genetic dfn simulation workflow that produces a hierachical dfn. it uses mechanical proxies inspired from mechanics to sample parameter distribution laws and to efficiently organize simulated fractures in space. this work has been funded by the ring consortium (https://www.ring-team.org).
00089On Demand‘Online’ Marchenko Focusing and Target-oriented Modeling
E-Lecture Recording
Patrick ElisonE-Lecture RecordingOn DemandOn DemandEAGEwith the marchenko method one can derive an incident wavefield (a so-called focusing function) that focuses at an arbitrary location inside a medium and subsequently continues as a diverging wavefield. this is often denoted as creating "virtual sources” inside a medium. in this talk you will learn how such a focusing function can be obtained by iteratively sending a wavefield into a medium and simultaneously recording its reflection response. this requires control over densely sampled sources and receivers at the surface of an object in combination with an a-priory known smooth velocity model. further, this talk teaches you how the result of the marchenko scheme can be used for target-oriented seismic modeling, which is of use for localized inversion and time-lapse reservoir monitoring.
00090On DemandViscoelastic Full Waveform Inversion; a Symmetrization Strategy
E-Lecture Recording
Gabriel Fabien-OuelletE-Lecture RecordingOn DemandOn DemandEAGEseismic propagation may exhibit very complex physics, especially on land where elastic and attenuation are dominating effects. in this context, full waveform inversion (fwi) must move from the acoustic approximation to the more challenging viscoelastic wave equation. in this video, gabriel fabien-ouellet explains the theory behind viscoelastic full waveform inversion. using a symmetrization transformation of the problem, he shows how the adjoint state method can be modified to simplify the numerical implementation of viscoelastic fwi, and then presents the main challenges of inverting for attenuation.
00091On DemandIntegrated Geophysics and New Methods for Multi-nodal Data Analysis
E-Lecture Recording
Paolo Dell' AversanaIntegrated GeophysicsIntegrated GeophysicsE-Lecture RecordingOn DemandOn DemandEAGEthe central subject of this e-lecture is the concept of “expanded integration”. this involves all the key aspects of the process of integration of geophysical and geological data. in fact, expanded integration includes combination of multi-physical, multi-scale, multi-domain and multi-sensory (images and sounds) information. this comprehensive approach is performed using new methods of data analysis. these are called “brain based technologies” because they take into account the key aspects of “high-level” human cognition, such as integrated perception, data fusion, imaging, mapping, combination of multi-sensory inputs and pattern recognition.
00092On DemandOne 4D Geomechanical Model - and it's Many Applications
E-Lecture Recording
Jorg HerwangerGeomechanicsGeomechanicsE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture is a worked case-study in applied oilfield geomechanics: it introduces the elements of a geomechanical model, covers aspects of geomechanical model building and calibration, and works through three applications of the geomechancial model in support of operational decisions. the geomechanical applications presented by jorg include wellbore stability for drilling an inclined infill well, risk of fault re-activation during gas reinjection and fracture containment in individual reservoirs during hydraulic stimulation.
00093On DemandQ-Compensation Through Depth Domain Inversion
E-Lecture Recording
Maud CavalcaE-Lecture RecordingOn DemandOn DemandEAGEcompensation for seismic attenuation inherent to the dissipative and dispersive nature of the earth remains a challenge in seismic imaging of complex media. in this e-lecture, maud cavalca briefly reviews various deterministic approaches that tackle the problem, and focuses on a scheme that compensates for q within depth domain inversion. she shows that this type of approach constitutes a viable and efficient alternative to ‘q-migration’ techniques that attempt at compensating for q during migration.
00094On DemandAutomatic Gas Pockets Detection by High Resolution Volumetric Q-Tomography Using Accureate Frequency Peak Estimation
E-Lecture Recording
Fatiha GamarE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture, fatiha gamar explains how a high-resolution volumetric q tomography can be developed to attain an accurate volumetric estimation of the attenuation model. a key component of the workflow is the estimation of effective attenuation in the pre-stack data domain through accurate picking of the frequency peak. finally she presents a case study where this approach has been used to reveal shallow gas pockets and compensate for absorption in the migration.
00095On DemandSubsalt Time-Lapse Seismic for Reservoir Monitoring Using i4D in Deepwater
E-Lecture Recording
David ChalenskiReservoir CharacterizationE-Lecture RecordingOn DemandOn DemandEAGEdavid chalenski presents a case study using a low-cost but high-data-quality seismic technique to monitor a waterflooded field. this technique, termed i4d, utilizes simple planning methods to decimate a source and nodal receiver patch from a previous full-field survey to monitor the area around a high-risk, high-yield well (such as a water injector) with high accuracy and confidence. he demonstrates that nodal surveys can be targeted even in a highly complex sub-salt field. if planned appropriately, expected data quality is equivalent to a full-field nodal survey. he shows the 4d results and presents business decisions which were influenced using the results of this survey.
00096On DemandCognition and Seismic Interpretation
Student E-Lecture Recording
Gaynor PatonSeismicSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEseismic interpretation involves high level cognitive processes in order to understand the information that is contained within the seismic data. in this e-lecture, gaynor paton looks at the cognitive processes involved in converting data into understanding, and how we can work in a manner that maximises our cognitive abilities. working in a way that is cognitively intuitive will reduce the effects of cognitive overload and give us more insight into the subsurface.
00097On DemandAn Analytical Approach to Hydraulic Fracturing
Student E-Lecture Recording
John DuhaultReservoir CharacterizationRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture john l.j. duhault discusses the 15 things you should consider as part of a checklist to determine whether “to monitor or not to monitor” your project well operations while hydraulically fracturing, injecting into or depleting an oil or gas reservoir.
00098On DemandThe Startup of Permanent Reservoir Monitoring for Snorre and Grane
E-Lecture Recording
Mark ThompsonReservoir CharacterizationE-Lecture RecordingOn DemandOn DemandEAGEstatoil has supported the development of geophysical reservoir monitoring (grm) techniques, and through a focused seismic monitoring (fsm) project, successfully piloted permanent reservoir monitoring (prm) technologies. in this e-lecture, mark thompson tells that this experience culminated in the implementation of two prm projects at the snorre and grane licenses. in december 2012, statoil awarded a contract to manufacture and deliver approximately 700 kms of seismic cable for prm installations, representing the largest prm installation to date. by october 2014, two full prm systems had been installed with first seismic acquired at both grane and snorre, and a second survey underway at snorre. in less than two years a major prm project had been successfully executed and first seismic acquired.
00099On DemandChasing Channel Sands
Student E-Lecture Recording
Peter LloydReservoir CharacterizationRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEwith technical advances in surface seismic and downhole electrical imaging techniques, it is now possible to not only map the distribution of reservoir sandstones in the subsurface, but to accurately define the orientation of productive fairways, or “sweet-spots”, within the sequence. channel sands frequently have favourable reservoir characteristics. having often been laid down in higher energy settings, they commonly have coarser and better sorted grains, less clay and improved poroperm characteristics. however, they often have limited lateral extent and shoe-string geometries which make them more difficult to predict in the subsurface. in this presentation, peter lloyd will summarize the results of four case studies of how channel sands, laid down in different depositional settings, have been recognized with borehole imaging in exploration, appraisal and development settings. from sedimentary features and palaeocurrent directions within the sands it has been possible to determine their orientation and evolve improved exploration and development strategies. further complexities in reservoir characterization, caused by thin beds or bioturbation; and how these effects can be recognized on the images, and quantified using other electric log data, will be discussed.
00100On DemandAn Introduction to Migration without a Single Equation
E-Lecture Recording
Claudio StrobbiaSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture is a primer on seismic migration: it introduces the principles of imaging, the assumptions and limitation, the artefacts. it discusses also the differences between time and depth migration, and examines the requirements of the simple time migration. claudio strobbia here explains these concepts in an easy and understandable way, with lots of illustrations and animations, and without a single equation. a simple and entertaining initiation to seismic imaging.
00101On DemandBarents Sea Case Study: Integrated Depth Velocity Model Building
E-Lecture Recording
Marit GuttormsenE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture, marit guttormsen presents the results of a 3d obs dataset acquired in the barents sea. the result was a significant uplift in the structural image by imaging the pressure energy converted to shear energy (ps). in order to achieve the image an integrated velocity model building (vmb) flow, using several datasets and a variety of techniques, was implemented. the lecture attempts to summarize the key steps in such an integrated vmb workflow.
00102On DemandA Tutorial on Gassmann’s Fluid Substitutions
Student E-Lecture Recording
Pierre-Olivier LysReservoir CharacterizationRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEgassmann's equations are widely used in the industry to address the fluid substitution problem during seismic reservoir characterization. in this e-lecture, pierre-olivier lys shows how to use gassmann's equations properly, by explaining the fundamental assumptions that should be met, and by applying the gassmann's methodology in a step-by-step example.
00103On DemandFrequency Decomposition of Seismic Data
Student E-Lecture Recording
Gaynor PatonSeismicSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEeage student e-lecture: frequency decomposition of seismic data by gaynor paton frequency decomposition and rgb blending are commonly used to aid seismic interpretation. this lecture looks at the three main methods of frequency decomposition and discusses the relative advantages of each technique. it also covers some short case studies showing how the correct technique should be used depending on the interpretation objective. the lecture also covers rgb blending and how this can be used to understand and interpret the frequency response volumes.
00104On DemandSub-Salt modelling in 3D – Integration of Seismic, Well and Gravity Data, Validated by Drilling
E-Lecture Recording
Antony PriceIntegrated GeophysicsIntegrated GeophysicsE-Lecture RecordingOn DemandOn DemandEAGEoffshore sub-salt seismic imaging along the west african margin is a challenge in many areas, and with complex salt geometry, seismic depth imaging alone faces certain limitations. in an effort to further de-risk structures sub-salt, antony price et al. integrated with gravity data in 3d. they detail that the incorporation of an independent geophysical parameter, such as density can effectively de-risk these difficult targets. coincident gravity anomalies and seismic base salt closures were observed in this locality. the gravity anomalies are larger in amplitude and not equivalent to any possible post-salt structure, independent of density. in short, the scenario 3d gravity modelling suggests that these are indeed sub-salt structures, most likely localized basement or some other high density closures - which is consistent with the seismic imaging.
00105On DemandWell Tie: Principles and New Advancements for Broadband Seismic Data
E-Lecture Recording
Ehsan NaeiniSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEin this presentation, naeini discusses a quantitative approach to do well tie and to qc the outcome. this covers the basic principles all the way to the latest developments for broadband seismic data. he shows some synthetic and real data examples and highlights the impact of time lag, phase, bandwidth and broadband wavelets for broadband seismic.
00106On DemandWave-Equation-Based AVO Inversion for High-Resolution Reservoir Characterisation
E-Lecture Recording
Dries GisolfE-Lecture RecordingOn DemandOn DemandEAGEwave-equation-based avo inversion aims at getting high-resolution property models from seismic data. these property models should allow the building of reservoir models and the estimation of reserves. wave-equation-based avo inversion fully utilises the non-linear relationship between seismic data and the properties to be inverted for, leading to a wider spatial bandwidth than could be expected on the basis of the temporal bandwidth of the data. also, it inverts directly for elastic parameters, giving a higher sensitivity to pore-fill than conventional impedances.
00107On DemandApplied AVO
E-Lecture Recording
Anthony FoggReservoir CharacterizationE-Lecture RecordingOn DemandOn DemandEAGEavo (amplitude versus offset) analysis is a method many geoscientists may be aware of, but they perhaps do not know how the techniques are implemented and the best way to apply the technology. this e-lecture introduces the basics of the avo theory and how it is used to create attributes from seismic reflection data that reveal the underlying rock and fluid characteristics of the sub-surface. it uses synthetic models to demonstrate the importance of velocities and migration algorithms in obtaining the optimum seismic image for avo and subsequent pre-stack seismic inversion analysis.
00108On DemandUnderstanding Spectral Decomposition
E-Lecture Recording
Victor AarreSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEspectral decomposition is a standard tool in the seismic interpreters toolbox. it is also a complex tool to use. many implementations are provided as “black box” technology by vendors, and presented results are often spectacular. the scope of this lecture is hence to give the viewers a thorough scientific understanding of what spectral decomposition is, outline how it works, and explain what it can and cannot do. it has been an aim to keep the mathematical terminology simple, and properly explain the terms as they are introduced, such that the content becomes more accessible for an audience outside the hard-core mathematical community.
00109On Demand3D Inversion of Magnetic Data Affected by Remanent Magnetization
E-Lecture Recording
Yaoguo LiNear SurfaceNon-seismic MethodsE-Lecture RecordingOn DemandOn DemandEAGEthe inversion of magnetic data in the presence of strong remanent magnetization has long been a challenging problem, because of the unknown direction of the total magnetization that is the vector sum of the induced and remanent components. this e-lecture presents three different techniques for tackling this problem: (1) direction estimation, (2) amplitude inversion, and (3) fuzzy c-means clustering magnetization inversion. combined with the existing susceptibility inversion, these techniques form a tool kit that allows one to invert virtually any magnetic data set for the purpose of quantitative interpretation in exploration applications. in particular, the magnetization inversion provides a new opportunity both for imaging source configurations and for carrying out geology differentiation.
00110On DemandWide-Azimuth Acquisition with Radial Domain Interpolation for Fluvial Morphology Interpretation
E-Lecture Recording
Anastasia PooleSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEthe topic of anastasia poole’s e-lecture is wide-azimuth acquisition with radial domain interpolation for fluvial morphology interpretation. during this presentation she will demonstrate how an integrated approach helps to unlock the fluvial morphology reservoir potential using seismic. poole will cover the following topics: reservoir geology and economics evaluation, seismic survey design, seismic acquisition, processing and she will finish off with examples of inversion and interpretation. key technologies discussed in this presentation are: point-source point-receiver full azimuth/broad band acquisition, azimuth aware processing with radial domain interpolation to enable advanced seismic interpretation and rock properties extraction.
00111On DemandSeismic Multiple Removal Techniques: Past, Present and Future
E-Lecture Recording
Eric VerschuurSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEeric verschuur offers a short version of his eet 1 tour, explaining how multiple reflections influence seismic measurements. an overview is provided of the techniques that were developed to remove them, from the (high-resolution) parabolic radon transform to the full 3d srme technique of today. he also discusses the extension to internal multiples and, finally, looks into the future, where multiples could be used as signal in imaging procedures. learn more about the eet programme.
00112On DemandImpact of Acquisition Geometry on AVO/AVOA Attributes Quality
E-Lecture Recording
Amine OurabahSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEwith hydrocarbon exploration moving to more complex plays, understanding the resolution limits of seismic imaging and attributes is more important than ever, especially with the availability of new acquisition methods like iss® and dsss allowing acquisition of very high density surveys at a reduced cost. questions as: ‘what are the benefits of acquiring dense surveys, how do they impact the frequencies, avo/avao attributes’ can be difficult to answer and yet have a significant impact on cost, quality and decision making. attempts to answer some of these questions using the theory of resolution or synthetic modelling are available. however, we rarely have the opportunity to see the effect of decimating a real dataset on a full range of conventional and azimuthal attributes. in this study we are decimating the risha high density survey to 20 different geometries. each one of these geometries were then separately processed and an extensive list of pre-stack conventional and azimuthal attributes were extracted on them. by analysing and comparing these products, we attempt to answer the above questions, using the densest geometry as a benchmark for quality.
00113On DemandSeismic Screening for Hydrocarbon Prospects Using Rock-Physics Attributes
E-Lecture Recording
Per AvsethRock PhysicsRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEa methodology to create easy-to-implement rock-physics attributes that can be used to screen for reservoir sandstones and hydrocarbon pore fill from seismic inversion data is demonstrated. we have honored the physical properties of the rocks by defining attributes that complied with calibrated rock-physics models, including the fluid and rock impedances. we have demonstrated the use of these attributes on well log and seismic inversion data from the norwegian sea, and we successfully screened out reservoir rocks filled with either water or hydrocarbons. this video is part of eage online education programme. the european association of geoscientists and engineers (eage) is a global professional, non-profit association for geoscientists and engineers. eage strives to promote innovation and technical progress and aims to foster communication and cooperation between those working in, studying or interested in these fields. to learn more about eage education visit www.learninggeoscience.org the contents introduced in this e-lecture are part of a comprehensive course offered by per avseth via eage. consult our calendar of events to learn about the upcoming deliveries of request it for in-house training!
00114On DemandQuantitative 4D Analysis Using Business Analytics
E-Lecture Recording
Mark ThompsonSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEin geophysical reservoir monitoring (grm) seismic data, reservoir data, production data, and borehole data must be integrated to get an understanding of what is going on in the reservoir over time. the information used in grm is a typical example of big data, as it can be characterized by volume, velocity, and variety. the learnings of big data from other industries have been leveraged and applied to quantitative analysis in grm. did you like this video? you can request a webinar with mark thompson to learn more
00115On DemandMulti-Azimuth Streamer Seismic in The Nile Delta: Depth Imaging
E-Lecture Recording
Walter RietveldSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEbp has been acquiring multi-azimuth (maz) streamer seismic in the nile delta since 2003. the initial results showed that maz data greatly improves general image quality, signal-to-noise ratio and lateral resolution, and suppresses diffracted multiples effectively. e-lecture part 1 discusses the reasons why maz was selected and discusses the first results after time processing and pstm imaging. e-lecture part 2 discusses the workflow that combines the maz data in a multi-parameter reflection tomography approach to build a detailed velocity model that shows variations which correspond very well to the geology interpreted from the seismic, and which yields improved psdm images. the results and learnings from both presentations are relevant and applicable to wide-azimuth acquisition and processing in general.
00116On DemandGeological Well Testing in Fractured Reservoirs
E-Lecture Recording
Patrick CorbettGeological ModellingGeological ModelingE-Lecture RecordingOn DemandOn DemandEAGEin this contribution we consider synthetic well test responses generated through numerical simulation of a model derived from an outcrop-based fault/fracture geometry. we consider how the well might connect with the fractures to help understand relationships between the different fracture well test responses.
00117On DemandThe Art of Science
E-Lecture Recording
Roel SniederTraining and DevelopmentSoft SkillsE-Lecture RecordingOn DemandOn DemandEAGEthis video gives a brief overview of the eage course “the art of science.” this class gives general professional skills needed to be effective and successful in research. these skills include generating research questions, creating a work plan, scientific publishing, oral and written communication, time management and many other topics.
00118On DemandSeismic Anisotropy in Shaly Formations…Revisited
E-Lecture Recording
Patrick N.J. RasolofosaonRock PhysicsRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEseismic anisotropy, that is to say the directional dependence of seismic velocity, is quite common in sedimentary formations and is often linked to the presence of shale. if not correctly taken into account it can strongly affect surface seismic data interpretation, seismic to well tie and azimuth versus offset analysis. from the analysis of two large databases of up to 800 ‘shaly’ samples in a broad sense, including shales but also mudshale, clayshale, siltstone, argillite, claystone, siltshale, mudstone, we demonstrate that seismic anisotropy in such formations is to a large extent determined by factors other than compaction processes, such as depositional environment, chemical composition of fluid, silt fraction, etc. furthermore, the alignment of the individual clay platelets, main constituents of shales, can explain most of the anisotropy measurements of the databases. assuming the elastic properties of the individual clay platelets, we propose simple plots for straightforwardly quantifying the legendre orientation distribution function coefficients and of the clay platelet alignment from the measurement of seismic anisotropy parameters.
00119On DemandSeismic Characterization of Shallow Gas in The Netherlands
E-Lecture Recording
Mijke van den BoogaardReservoir CharacterizationE-Lecture RecordingOn DemandOn DemandEAGEthe cenozoic in the dutch offshore is known to host abundant shallow amplitude anomalies related to hydrocarbons. the netherlands is the first country in the north sea area in which shallow gas is developed and has proven to be a valuable resource. amongst 3 successfully producing fields and 5 additional proven accumulations, ebn has identified more than 150 leads from seismic data (bright spots). in terms of volumes several of those leads are expected to rank economically. the success of the producing fields, initial volumes, and the large availability of 3d seismic data has contributed to an increased interest from the industry. the work that is presented includes an overview of the shallow gas play in the northern dutch offshore and focuses on the seismic characterization system established to help selecting those bright spots that have highest potential for development. the main objectives are to de-risk the play and to improve the understanding of the relation between seismic anomalies and gas saturation.
00120On DemandPetrographic coded correlations in petrophysics
Student E-Lecture Recording
Nina GegenhuberPetrophysicsRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEeage student e-lecture: petrographic coded correlations in petrophysics by nina gegenhuber petrophysics refers to the research on the physical properties of rocks, their experimental and theoretical derivation and their correlations. in this e-lecture the petrographic coded model concept will be explained and some examples of the first applications are shown. the first application of the model was to derive a correlation between thermal conductivity and compressional wave velocity. the model concept can help to understand various influencing factors for the different petrophysical properties and become a powerful tool for data interpretation.
00121On DemandIn-Situ Local Angle Domain Sata as an Ideal Representation for Directivity Driven Imaging
E-Lecture Recording
Zvi KorenE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture zvi koren presents a novel imaging system for enriching (maximizing) information from the available recorded seismic data. the system is based on two stage imaging process composed of: 1. mapping into the local angle domain (lad): internal optimal beam forming and in situ full wavefield mapping and decomposition (binning) of the 5d recorded seismic data into the subsurface 7d lad using a bottom-up ray-based migration operator. the resulted imaged dataset is organized and stored as 5d angle-domain common image gathers, where each depth point consists of two directional angles (apparent dip and azimuth) and two scattering angles (opening angle and opening azimuth). 2. lad-based conditioning and processing: mute, data reconstruction, q compensation lad-based imaging: ability to selectively enhance structural model continuity (specular energy imaging) and high resolution discontinuous objects: small faults and fracture systems (diffraction imaging) or near vertical walls (corner-waves imaging) directly from the 5d lad gathers it is shown that the method enhances the data components associated with the seismic modelling used for the migration (e.g. primary p-waves) and simultaneously attenuates all other data characteristics (“noise”; “multiples”) in both data and space-angle domains.
00122On DemandQuantitative Analysis of Schoonebeek SeisMovie Data
E-Lecture Recording
Paul ZwartjesReservoir CharacterizationE-Lecture RecordingOn DemandOn DemandEAGEa permanently installed seismovie™ system was deployed at schoonebeek oil field in the netherlands to monitor steam injection in one of the patterns. qualitatively, the 4d data has given us unprecedented insight into the lateral extent and temporal evolution of the steam front. we attempted to invert directly for steam thickness but the limited areal extent of the system (narrow swath) resulted in a sub-optimally imaged stack that did not match the synthetic data generated from the reservoir model (i.e., we could not “close-the-loop”). instead, we compared forward modelled data generated from a history matched reservoir model to 4d synthetic and observed time lapse seismic attributes and concluded that we see a slow vertical steam chest growth of approximately 1.7cm/day over a 7 month period.
00123On DemandPaleogeography and Stratigraphy
E-Lecture Recording
Juan TavellaStratigraphyStratigraphyE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture juan tavella describes the main aspects of a case study for unconventional reservoir characterization of the upper jurassic shale in northern mexico. it is based on the workflow developed in the past three years to predict key properties to understand the behaviour of a source rock as a reservoir. it integrates well and seismic to provide attributes that in a exploratory scenario will help to outline high potential zones and to generate useful information to design drilling navigation and completion.
00124On DemandSeismic Surveillance for Reservoir Delivery "A Practitioner's Perspective"
E-Lecture Recording
Olav Inge BarkvedReservoir CharacterizationE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture olav barkved will share examples of value creation from 4d seismic and demonstrate how the technology can be taken a step further through the use of field-wide permanent installed seismic sensors. permanently installed systems for seismic surveillance offer frequent and high quality seismic time-lapse surveys to be used for active reservoir management, to support the drilling of infill wells, and to assist the production engineers in managing the wells. olav, currently with petoro and previously with bp norway, is sharing from his experience in managing and making the most out of a dedicated seismic surveillance system for reservoir delivery.
00125On DemandAccurate Modelling and Inversion With Structural Models Using The Finite-Difference Method
E-Lecture Recording
James HobroE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture james hobro (schlumberger gould research) describes a new approach to representing complex 3-d structural features (e.g. salt bodies) in gridded modelling and inversion applications. this approach removes the model parameter aliasing commonly present in gridded models and allows structural boundaries to be positioned to sub-cell accuracy. it can be linearized to enable inversion methods that operate on gridded models to update the shape parameters describing model structure directly. it is shown in synthetic modelling tests that this method significantly improves the accuracy of seismic data modelled using the finite-difference method in the presence of high-contrast structural features such as salt bodies. an application to full waveform inversion is also demonstrated using synthetic data, in which bulk shifts and fine structure are resolved in a complex top-salt gulf-of-mexico model.
00126On DemandData-Driven Green's Function Retrieval from Reflection Data
E-Lecture Recording
Kees WapenaarSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEthis e-lecture introduces new reflection imaging methodology, which deals with internal multiples. first, an iterative scheme retrieves focusing functions from reflection data at the surface, which focus onto virtual sources in the subsurface. next, the responses to these virtual sources, the green’s functions, follow from the focusing functions and the reflection data. once these green’s functions are obtained, reflection imaging can be carried out by which the primaries and internal multiples are mapped to their correct positions, with correct reflection amplitudes and without the occurrence of false images at wrong positions.
00127On DemandPassive Seismic Surface-Wave Interferometry for Reservoir-Scale Imaging
E-Lecture Recording
Sjoerd de RidderE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture sjoerd de ridder provides an introduction to passive seismic interferometry using surface waves with applications to reservoir geophysics. first, he addresses the nature of seismic noise typically recorded at low frequencies by marine seismic arrays. then, he explaines the basic principle of passive seismic interferometry and shows virtual seismic sources obtained by cross-correlating microseism noise. lastly, he demonstrates example applications of imaging anisotropy and time-lapse velocity changes using virtual seismic sources.
00128On DemandNotional ghosts
E-Lecture Recording
Gary HampsonSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEin this e-lecture: gary hampson, principal research geophysicist at downunder geosolutions, will explain an extension to the airgun notional source concept called notional ghosts. these are conceptual devices that describe the source ghost in terms of virtual monopole sources each of which has its own signature. as with notional sources, although notional ghosts are never directly observed, they are derived by inversion of the pressure wavefield recorded by the near field hydrophones. in this lecture gary explains the motivation for this new concept, its theoretical basis and shows real examples.
00129On Demand4D Inversion of Continuous Land Seismic Reservoir Monitoring of Thermal EOR
E-Lecture Recording
Laurène MichouEngineeringPetroleum EngineeringE-Lecture RecordingOn DemandOn DemandEAGElaurene michou (cgg) presents 4d seismic inversion results from a continuous seismic monitoring survey of the schoonebeek reservoir produced by thermal eor. the 4d simultaneous stratigraphic inversion methodology was driven by the continuous nature of the monitoring. inversion results brought significant insight about steam distribution.
00130On DemandResolving Near-Surface Velocity Anomalies in Marine Data
E-Lecture Recording
Ian JonesE-Lecture RecordingOn DemandOn DemandEAGEunresolved velocity anomalies in the near surface degrade deeper imaging. as a consequence, great care needs to be taken to ensure that all significant near-surface effects have been dealt with before attempting to build the deeper parts of a velocity-depth model. in order to incorporate velocity anomalies into the model, a range of options can be used, depending on whether the geobody geometry alone is discernible, or whether its velocity distribution is also known. here i describe current industrial practice for building complex near-surface models, which is based on a range of approximate techniques, as well as the more complete solution offered by the emerging technology of waveform inversion. although building complex near surface models is a painstaking process, a suitable near-surface velocity model can usually be obtained.
00131On DemandAn Electromagnetic Survey Of A Gas Hydrate Vent Offshore Mid-Norway
E-Lecture Recording
Andrei SwidinskyNear SurfaceNon-seismic MethodsE-Lecture RecordingOn DemandOn DemandEAGEandrei swidinsky describes a transient electromagnetic survey to image the resistivity structure of the hydrate vent cne03, offshore mid-norway (located approximately 10 km north of the storegga slide sidewall). the experiment is unique in that the electric dipole transmitter has two polarizations for each transmission station. furthermore, the newly designed transmitter is deployed in a pogo-style acquisition, which is suitable for a detailed investigation of a small scale seafloor target. the geometry of the experiment makes conventional interpretation methods difficult so that we simplify the data by creating a single rotationally invariant quantity from the original four electric field measurements (two electric field measurements for two transmitter polarizations). this invariant is further reduced to an apparent resistivity, which is useful for rapid resistivity mapping of the seafloor. results show that cne03 is characterized by increased apparent resistivities which correlate well with increased p-wave velocities determined from ocean bottom seismometer measurements.
00132On DemandWater Velocity and Tide Measurement in Marine Seismic Acquisition
E-Lecture Recording
Kanglin WangSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEkanglin wang (shell) discusses how to improve time-lapse (4d) seismic with novel water statics processing involving a seafloor device called pies. a well known challenge in marine 4d processing is the non-repeatability introduced by water velocity and tidal variations during a survey and between different surveys. pies provides direct measurement and continuous monitoring of these water properties and greatly reduces the uncertainties in timing and positioning of seismic data.
00133On DemandDistributed Acoustic Sensing Cable for Surface Seismic
E-Lecture Recording
Kees HornmanReservoir CharacterizationE-Lecture RecordingOn DemandOn DemandEAGEdistributed acoustic sensing (das) is a relatively novel technology, which uses a fibre-optic cable as sensor. advantages are that the cable is passive, it does not have separate detectors and the channel spacing can be set by the instrument. das has already found applications in monitoring of hydraulic fracturing and vsps. a downside is that a straight fibre has no broadside sensitivity and can therefore not be used for reflection seismic with horizontal cables. a helically wound cable (hwc) solves that problem; the video describes a field trial, which confirms the theoretically expected isotropic sensitivity of the hwc for p-waves.
00134On DemandWave Equation Receiver Deghosting
E-Lecture Recording
Craig BeasleySeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEcurrent solutions to receiver deghosting of marine seismic data generally involve making complementary measurements of the wavefield or, alternatively, involve estimation of data not recorded due to ghost interference. in this talk, we introduce a new approach that rigorously deghosts single measurement data (p-wave only, for example) without relying on estimation of missing data, which was previously thought to be mathematically impossible. we use the wave equation to compute directly the up and downgoing wavefields between the receiver and the surface. this migration-like approach is possible given that the upcoming wavefield is causal with respect to the downgoing wavefield, a good assumption if certain types of noise such as the direct arrivals are removed from the recorded wavefield. moreover, our method exposes the underlying physics of the problem and thereby naturally allows for complexities such as variable water velocity, sea surface, complex surface reflection conditions and arbitrary receiver configurations.
00135On DemandDip Correction for Convolutional Modelling and Elastic Inversion
E-Lecture Recording
Adam CherrettSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEconvolutional seismic modelling is a very convenient and fast technique, widely used in geoscience. it is usually applied in the vertical dimension only, which is one of its shortcomings, leading to inaccurate modelling and restricting its applications. this talk concerns a simple pseudo-3d extension to the convolutional model which improves modelling of dipping events and the lateral resolution of seismic data. this same 3d operator, when used to invert images for elastic properties, can reduce artefacts and improve resolution.
00136On DemandSatellite InSAR Data Reservoir Monitoring From Space
E-Lecture Recording
Alessandro FerrettiEngineeringPetroleum EngineeringE-Lecture RecordingOn DemandOn DemandEAGEsatellite radar data for surface deformation monitoring are gaining increasing attention. they provide a powerful tool for remotely measuring small surface displacements that can be applied successfully to many different applications, spanning from sinkhole detection to reservoir optimization. this course provides a step-by-step introduction to satellite radar sensors, sar imagery, sar interferometry and advanced insar techniques. rather than a tutorial for remote sensing specialists, the course starts from very basic concepts and explain in plain language the most important ideas related to sar data processing and why geoscientists and engineers should take a vested interest in this new information source.
00137On DemandPseudo-Elastic Impedance - A Norwegian Sea Demonstration
E-Lecture Recording
Per AvsethRock PhysicsRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEin recent years, elastic inversion and quantitative interpretation of pre-stack seismic data have become standard procedures in the petroleum industry. in this presentation, per avseth (norwegian university of science and technology) compares extended elastic impedance trends at different chi angles, with rock physics template models. he demonstrates that the elastic impedance attribute does not always comply with the complexity and non-linearity of rock physics models related to geological processes. he also shows how one can honour the non-linearity of a rock physics model and create pseudo-elastic impedance as a function of deviation away from a curved water-wet rock physics model itself (cpei). finally, per demonstrates the use of this approach on seismic inversion data from a selected area in the mid norwegian sea, by mapping of lithology and fluid anomalies that are consistent with rigorous rock physics models. this video is part of eage online education programme. the european association of geoscientists and engineers (eage) is a global professional, non-profit association for geoscientists and engineers. eage strives to promote innovation and technical progress and aims to foster communication and cooperation between those working in, studying or interested in these fields. to learn more about eage education visit www.learninggeoscience.org per avseth is the instructor in a short course and a webinar offered via eage. consult our calendar of events to learn about the upcoming deliveries of request it for in-house training!
00138On DemandHigh Resolution 3D Tunnel Seismic Reflection at Olkiluoto, Finland
E-Lecture Recording
Calin CosmaSeismic AcquisitionE-Lecture RecordingOn DemandOn DemandEAGEcalin cosma (vibrometic) describes the high-resolution seismic techniques, used for rock characterization ahead and around the access tunnel of the spent nuclear fuel disposal facility, currently being built at olkiluoto, finland. long fractures and deformation zones were identified and mapped up to hundreds of meters from the tunnel. the methodological novelty has been the introduction of the 3d image point migration, which proved to be very effective for the imaging of low-aperture rock features with various orientations. the results are compared with the current site model and observations in tunnels and boreholes.
00139On DemandVolume Based Modeling: Automated Construction of Complex Structural Models
E-Lecture Recording
Laurent SoucheGeological ModellingGeological ModelingE-Lecture RecordingOn DemandOn DemandEAGElaurent souche (schlumberger) exposes the latest advances in structural modeling. after discussing the conceptual differences between surface-based and volume-based approaches for building 3d faulted structural models of the subsurface, the key algorithms underlying the volume-based technology are described. the main geological and geometrical constraints controlling the interpolation of a 3d attribute representing the relative geological age of the formations are also detailed. finally, advantages of volume-based methods are illustrated using synthetic examples, physical sandbox models and real field data.
00140On DemandSeismic 4D Inversion for Quantitative Use in Automated History Matching
E-Lecture Recording
Milana AyzenbergReservoir CharacterizationE-Lecture RecordingOn DemandOn DemandEAGEmilana ayzenberg (statoil) discusses the different aspects of using 4d seismic for conditioning reservoir models. assisted history matching is employed to match the reservoir production history and the 4d seismic inversion data simultaneously. the three building bricks of a conditioning workflow are the forward modelling from the reservoir model to the inverted 4d seismic attributes; the quantitative seismic inversion; and the history matching which closes the dynamic conditioning loop. milana discusses in detail these three components, with a particular focus on the quantitative aspects and uncertainties in a 4d inversion. the conditioning workflow is demonstrated on a north sea field which exhibits a complex 4d signal. the seismic data is inverted to 4d changes in elastic parameters. this data is further used for conditioning the reservoir model on equal footing with production and pressure data.
00141On DemandLeast Squares Reverse Time Migration
E-Lecture Recording
Bin WangSeismic ProcessingE-Lecture RecordingOn DemandOn DemandEAGEbin wang (tgs) briefly introduces a new imaging algorithm called least squares rtm (lsrtm). lsrtm is an inversion-based imaging algorithm, which aims to derive a better reflectivity image. similar to full waveform inversion, lsrtm is trying to minimize the data residual between a field-recorded seismogram and a synthetic modeled seismogram. like reverse time migration (rtm), lsrtm is based on the two-way wave equation. compared to a regular rtm, lsrtm has the following benefits: 1) it gives a high-resolution and broadband seismic image, especially the low frequency end; 2) it reduces migration artifacts due to acquisition foot print and non-uniform illumination; 3) the migration image has more balanced amplitudes, as lsrtm is towards true amplitude imaging.
00142On DemandRock Physics and Seismic Reservoir Prediction Contrained by Depositional and Burial Trends
E-Lecture Recording
Per AvsethRock PhysicsRock PhysicsE-Lecture RecordingOn DemandOn DemandEAGEin this compact version of his distinguished lecture programme presentation, per avseth (norwegian university of science and technology) discusses rock physics and seismic reservoir prediction constrained by depositional and burial trends. outline: 1. rock physics background and motivation 2. using compactional depth trends to improve lithology and fluid classification from avo -- a demonstration from the alvheim field, north sea. 3. how burial history and associated variation in rock stiffness affects 4-d time shifts -- an example from the troll east field, north sea. this video is part of eage online education programme. the european association of geoscientists and engineers (eage) is a global professional, non-profit association for geoscientists and engineers. eage strives to promote innovation and technical progress and aims to foster communication and cooperation between those working in, studying or interested in these fields. to learn more about eage education visit www.learninggeoscience.org per avseth is the instructor of a short course and a webinar offered via eage. consult our calendar of events to learn about the next deliveries or request one!
00143On DemandSeismic Geomechanics
E-Lecture Recording
Jorg HerwangerGeomechanicsGeomechanicsE-Lecture RecordingOn DemandOn DemandEAGEin this compact version of his eage education tour (eet 5), jĂśrg herwanger (ikon science, previously schlumberger) discusses the process of building and calibrating geomechanical models using 3d and 4d seismic data. he analyzes the three main uses that seismic data provide in building geomechanical models: horizon and fault interpretation for building structural models, avo inversion and rock physics models for creating mechanical property models, and for model calibration. herwanger elaborates on these three points in two case studies. the first case study presents a 3d exploration geomechanical model. the second study presents a 4d geomechanical model used for field development planning. the accompanying book is available in the eage bookshop: http://bookshop.eage.org/webshop/prod... this video is part of eage online education programme. the european association of geoscientists and engineers (eage) is a global professional, non-profit association for geoscientists and engineers. eage strives to promote innovation and technical progress and aims to foster communication and cooperation between those working in, studying or interested in these fields. to learn more about eage education visit www.learninggeoscience.org
00144On DemandHow to Submit a Good Abstract - Part 1
How-to-Video Recording
Aart-Jan van WijngaardenTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to submit a good abstract - part 1 are you planning to submit an abstract for the eage annual or an upcoming scientific conference? we have a new series of how-to videos focusing exactly on this! eage experts including the eage technical programme officer aart-jan van wijngaarden (equinor) shared their tips on what to avoid and things to remember when preparing an abstract for your next presentation.
00145On DemandHow to Submit a Good Abstract - Part 2
How-to-Video Recording
Milos CvetkovicTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to submit a good abstract - part 2 are you planning to submit an abstract for the eage annual or an upcoming scientific conference? we have a new series of how-to videos focusing exactly on this! eage experts including eage technical programme reviewer milos cvetkovic (spectrum geo) shared their tips on what to avoid and things to remember when preparing an abstract for your next presentation.
00146On DemandHow to Submit a Good Abstract - Part 3
How-to-Video Recording
Maartje HoubenTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to submit a good abstract - part 2 are you planning to submit an abstract for the eage annual or an upcoming scientific conference? we have a new series of how-to videos focusing exactly on this! eage experts including eage technical programme reviewer maartje houben (utrecht university) shared their tips on what to avoid and things to remember when preparing an abstract for your next presentation.
00147On DemandHow to Present to a Live Audience - Preparation
How-to-Video Recording
Ivan VasconcelosTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to present to a live audience - preparation six seasoned presenters, including eage technical programme reviewer ivan vasconcelos (utrecht university) share their experience and advice on preparing presentations, on how to capture and how to keep the audience’s attention and on what they have learned over the years. the videos address very practical questions and different situations, so whatever your concern, the answer is here.
00148On DemandHow to Present to a Live Audience - Non-Verbal Communication
How-to-Video Recording
Caroline LowreyTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to present to a live audience - non verbal communication six seasoned presenters, including eage technical programme reviewer caroline lowrey (spirit energy norway) share their experience and advice on preparing presentations, on how to capture and how to keep the audience’s attention and on what they have learned over the years. the videos address very practical questions and different situations, so whatever your concern, the answer is here.
00149On DemandHow to Present to a Live Audience - The Story, Part 1
How-to-Video Recording
Giles WattsTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to present to a live audience - the story, part 1 six seasoned presenters, including eage technical programme reviewer giles watts (watts geoscience consulting) share their experience and advice on preparing presentations, on how to capture and how to keep the audience’s attention and on what they have learned over the years. the videos address very practical questions and different situations, so whatever your concern, the answer is here.
00150On DemandHow to Present to a Live Audience - The Story, Part 2
How-to-Video Recording
Esther BloemTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to present to a live audience - the story, part 2 six seasoned presenters, including eage technical programme reviewer esther bloem (nibio – norwegian institute of bioeconomy research) share their experience and advice on preparing presentations, on how to capture and how to keep the audience’s attention and on what they have learned over the years. the videos address very practical questions and different situations, so whatever your concern, the answer is here.
00151On DemandHow to Present to a Live Audience - Interaction with the Audience, Part 1
How-to-Video Recording
Victor AarreTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to present to a live audience - interaction with the audience, part 1 six seasoned presenters, including eage technical programme reviewer victor aarre (schlumberger) share their experience and advice on preparing presentations, on how to capture and how to keep the audience’s attention and on what they have learned over the years. the videos address very practical questions and different situations, so whatever your concern, the answer is here.
00152On DemandHow to Present to a Live Audience - Interaction with the Audience, Part 2
How-to-Video Recording
John BrittanTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to present to a live audience - interaction with the audience, part 2 six seasoned presenters, including eage technical programme reviewer john brittan (ion) share their experience and advice on preparing presentations, on how to capture and how to keep the audience’s attention and on what they have learned over the years. the videos address very practical questions and different situations, so whatever your concern, the answer is here.
00153On DemandHow to Chair - Part 1: The Role of the Chairperson
How-to-Video Recording
Aart-Jan van Wijngaarden, Ivan Vasconcelos, John Brittan, Pierre-Olivier Lys, Paul Zwartjes and Roald van BorselenTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to chair a session – the role of the chairperson another important element contributing to the success of a presentation, as well as to a productive scientific exchange, is good chairing. in this series we explore the role of the chairperson with advice from experienced chairs, including eage technical programme officer aart-jan van wijngaarden (equinor) and technical programme reviewers ivan vasconcelos (utrecht university), john brittan (ion), pierre-olivier lys (total), paul zwartjes (aramco overseas company) and roald van borselen (aramco overseas company).
00154On DemandHow to Chair - Part 2: Keeping Time
How-to-Video Recording
Aart-Jan van Wijngaarden, Ivan Vasconcelos, John Brittan, Pierre-Olivier Lys, Paul Zwartjes and Roald van BorselenTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to chair a session – keeping time another important element contributing to the success of a presentation, as well as to a productive scientific exchange, is good chairing. in this series we explore the role of the chairperson with advice from experienced chairs, including eage technical programme officer aart-jan van wijngaarden (equinor) and technical programme reviewers ivan vasconcelos (utrecht university), john brittan (ion), pierre-olivier lys (total), paul zwartjes (aramco overseas company) and roald van borselen (aramco overseas company).
00155On DemandHow to Chair - Part 3: Creating an Engaging Session
How-to-Video Recording
Aart-Jan van Wijngaarden, Ivan Vasconcelos, John Brittan, Pierre-Olivier Lys, Paul Zwartjes and Roald van BorselenTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to chair a session – creating an engaging session another important element contributing to the success of a presentation, as well as to a productive scientific exchange, is good chairing. in this series we explore the role of the chairperson with advice from experienced chairs, including eage technical programme officer aart-jan van wijngaarden (equinor) and technical programme reviewers ivan vasconcelos (utrecht university), john brittan (ion), pierre-olivier lys (total), paul zwartjes (aramco overseas company) and roald van borselen (aramco overseas company).
00156On DemandHow to Chair - Part 4: Tips and Tricks for Problems during a Session
How-to-Video Recording
Aart-Jan van Wijngaarden, Ivan Vasconcelos, John Brittan, Pierre-Olivier Lys, Paul Zwartjes and Roald van BorselenTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to chair a session – tips and tricks for problems during a session another important element contributing to the success of a presentation, as well as to a productive scientific exchange, is good chairing. in this series we explore the role of the chairperson with advice from experienced chairs, including eage technical programme officer aart-jan van wijngaarden (equinor) and technical programme reviewers ivan vasconcelos (utrecht university), john brittan (ion), pierre-olivier lys (total), paul zwartjes (aramco overseas company) and roald van borselen (aramco overseas company).
00157On DemandHow to Get Published - Part 1
How-to-Video Recording
Malcolm FrancisTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to get published - part 1 are you considering publishing your paper in a scientific journal? are you looking for advice to enhance the quality of your research work and increase the chance to get your paper accepted? eage can help you on your way preparing that paper. in this series, two expert reviewers including malcolm francis (schlumberger) reveals their recipe for successfully published papers, including practical experience in the selection of appropriate journals for your subject of study, tips on academic research writing, the importance and role of co-authors, together with the dos and don’ts when submitting your paper and the proper reactions to a negative decision.
00158On DemandHow to Get Published - Part 2
How-to-Video Recording
Gareth WilliamsTraining and DevelopmentSoft SkillsHow-to-Video RecordingOn DemandOn DemandEAGEhow to get published - part 2 are you considering publishing your paper in a scientific journal? are you looking for advice to enhance the quality of your research work and increase the chance to get your paper accepted? eage can help you on your way preparing that paper. in this series, two expert reviewers including gareth williams reveals their recipe for successfully published papers, including practical experience in the selection of appropriate journals for your subject of study, tips on academic research writing, the importance and role of co-authors, together with the dos and don’ts when submitting your paper and the proper reactions to a negative decision.

2021

Siddharth Misra

Award-Spinning-coin-

Prof Dr Siddharth Misra’s research focuses on improving subsurface characterization and prospect evaluation for the exploration of hydrocarbons, minerals and water resources.

His major contribution is in the theory of electromagnetic responses of geological formations to various charge polarization phenomena. The theory has enabled him to introduce a multi-frequency electromagnetic log-inversion technique to remove dielectric effects for improved estimation of hydrocarbon pore volume.

EAGE_logo
Mobile_MenuIcon_closing

           First Break           EarthDoc