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Challenges and Uncertainty in Seismic Velocity Analysis Based Geopressure Prediction and the Application of GeostatisticsNormal access

Authors: C. Ryan, M. Igoe and A. Colhoun
Event name: 75th EAGE Conference & Exhibition - Workshops
Session: WS14 - 21st Century Operations Geology - The Frontiers of Pore Pressure Prediction
Publication date: 10 June 2013
DOI: 10.3997/2214-4609.20131264
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 648.47Kb )
Price: € 20

Only by understanding the geological aspects of overpressured systems can we hope to predict pore pressure accurately in frontier basins. Prediction of pore pressure is critical at several stages in the exploration and development process. Geophysical technologies play a central role in almost all aspects of hydrocarbon exploration, and geopressure prediction is no exception. Seismic velocity analysis techniques provide our most powerful method of geopressure prediction in underexplored basins, yet these techniques should not be used in isolation. Every effort should be made to enable any seismic-based prediction to be driven by available geological data, information, and experience of analogous basins. This paper investigates the potential improvements that can be made in geopressure analysis via intelligent use of log and seismic velocity analysis coupled with geological interpretation. We focus on basins where we have both reasonable and poor well calibration to examine how different velocity data sets predict geopressure in shale sequences. The key to building a geophysical framework that reflects nature is an understanding of the geology. Recognition of the challenges associated with the seismic experiment and imaging will allow more accurate velocities to be picked.

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