N038 VSPs in Exploration and Production
N038 VSPs in Exploration and Production
This course is designed to provide geophysicists and other geoscientists with a practical knowledge of borehole seismic techniques with the emphasis on the practical and effective application of VSP technology. The course makes extensive use of examples and case studies and includes some exercises to reinforce key learning points.
A three-day classroom course taught by using examples and case studies. Some exercises are included to reinforce concepts such as the depth time domain versus the offset time domain, interpretation of near well bore geology, identification of multiples and converted wave modes and the principles of survey design against objectives.
Participants will learn to:
At Competency Level 1: Awareness:
At overall Competency Level 2: Basic Application:
Borehole geophysical data in the form of the synthetic seismogram and vertical seismic profiles (VSP) is fundamental to the modelling, calibration and interpretation of modern surface seismic data. In the industry at large, an effective working knowledge of the application of VSP in exploration, development and production is generally lacking. Borehole seismic data particularly in the form of VSP are the best possible calibration of surface seismic data in that they are measures not models. Oil-company and Supplier geophysicists and others need to understand the technology available, the methods of acquisition, processing and the calibration and interpretation of the data. Additionally there is a wealth of already acquired multi component VSP data, the use of which would be beneficial to current surface seismic projects.
The course comprises modules on the acquisition, processing and interpretation of various forms of borehole seismic (VSP) data including 3D and measurements while drilling.
The concept of the VSP image as a near borehole high resolution “log” is introduced.
The integration of borehole geophysical data with other forms of data, particularly surface seismic, is a key topic for much of the course. The use of borehole geophysical data in surface seismic feasibility study, acquisition design, processing QA and the interpretation of conventional p-wave seismic including time-lapse data are discussed in this context.
The use of VSP data to measure and calibrate parameters such as polar and azimuthal anisotropy and absorption are illustrated by examples and case studies
The application of VSP technology to mode-converted surface seismic data is illustrated principally through case studies.
Special techniques such as cross well, salt-proximity and micro-seismic monitoring are reviewed.
Finally a view of future developments is given.
Vertical Seismic Profiling
The 3D VSP
VSP for Surface Seismic Feasibility, Survey Design, Processing and Interpretation
VSP Survey Planning
Interferometry (Virtual Source) Techniques
Cross Well Seismic
Salt Proximity Surveys
Monitoring and interpreting reservoir “noise” using downhole seismic arrays.
VSP and Smart Well Technology
The course will be suitable for any geoscientist who wishes to be educated in the technology and methodology of this branch of Geophysics. It is particularly suitable for those geophysicists who wish to learn about how borehole geophysical data, particularly seismic, can add value to the development and production of a reservoir. Even those who are well versed in the “art” of VSP should find value from many of the application modules particularly for mode converted seismic, anisotropy, demultiple and processing QC.
A basic knowledge of the seismic method is required. For those wishing to acquire this knowledge, N080 (Geophysics for Subsurface Professionals) is recommended prior to taking N038.
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