Borehole Seismic Fundamentals and Introduction to Advanced Techniques by Allan Campbell
This course has 6 sections. The course moves from giving a basic understanding of the most common surveys towards the newest techniques being developed to solve modern problems.
1. Introduction to Vertical Seismic Profiling
The VSP techniques used in industry are introduced. Basics of wireline acquisition, and an introduction to fiber based acquisition are covered. This section gives a brief overview of the value of all the commonly used borehole seismic techniques, from checkshot through to 3D VSP.
2. The Basics
Checkshot (velocity survey) and zero-offset VSPs are widely used, are simple to acquire and process, and have huge value. Acquisition, processing and interpretation of these 2 important
3. 2D and 3D Imaging
This section will focus on designing and interpreting walkaway VSP and 3D VSP surveys. Down-hole receivers create the opportunity for higher resolution images than surface seismic can provide, and can provide images in poor seismic imaging areas, or images where surface access is difficult. Advanced processing techniques will be discussed. Specifics of survey planning and acquisition will be covered.
4. Anisotropy and More
The anisotropy module will focus on extracting VTI and HTI anisotropy parameters from walkaway VSP and 3D VSP surveys. Seismic may be improperly imaged due to poor anisotropy assumptions. Having receivers down-hole and sources at the surface creates an ideal opportunity to measure anisotropy in-situ. Downhole arrays are also ideal for locating multiple generators and measuring Q.
5. Reservoir Monitoring and Reservoir Properties
This section focuses on time-lapse 3D VSP, which can observe reservoir changes with a greater precision than is possible with surface seismic. There is an overview of fracture detection and orientation with VSPs. Elastic FWI is being developed to measure the reservoir's elastic properties, and will be briefly covered. A discussion on very high resolution imaging and tomography with Crosswell seismic finishes the module.
6. Advanced Acquisition
Technology 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 is an emerging technology which enables efficient, fit-for-purpose VSP surveys with cost benefits over traditional wireline technology.
|Date:||25 - 26 June 2018|
|Location:||Kuala Lumpur, Malaysia|
|Instructor:||Mr Allan Campbell|