Improving sub-salt imaging using 3D basin model derived velocities |
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Authors: | R. Stephan Petmecky Martin L. Albertin Nick Burke |
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Affiliation: | 1. BP Exploration Operating Company Limited, Chertsey Road, Sunbury on Thames, Middlesex TW16 7LN, UK;2. BP Exploration, 200 WestLake Park Boulevard, Houston, TX 77079-2663, USA |
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Abstract: | The quality of depth imaging is directly related to the accuracy of the underlying velocity model. In most sub-salt settings, lack of angular illumination severely degrades the resolution and accuracy of velocity information derived from the seismic data itself. A standard approach for building a starting velocity model uses more reliable velocity information outboard of salt which is subsequently extrapolated to populate the sub-salt regions. The shortcoming of this method lies in the assumption that the effective stress observed outboard of salt can be extrapolated beneath salt solely as a function of depth below mudline. |
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Keywords: | Basin modeling Sub-salt velocity Effective stress Depth migration Imaging Integration Exploration Pore pressure prediction |
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