Crooked line, rough topography: advancing towards the correct seismic image |
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| Authors: | Samuel H Gray Gary Maclean & Kurt J Marfurt |
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| Institution: | Formerly at Amoco Exploration and Production Technology Group, PO Box 200, Station M, Calgary, AB T2P 2HP, Canada. Presently at Veritas DGC Inc., 715 5th Ave. SW, Calgary, AB T2P 5A2, Canada.,;Amoco Canada Petroleum Co. Ltd, PO Box 200, Station M, Calgary, AB T2P 2HP, Canada.,;Formerly at Amoco Exploration and Production Technology Group, PO Box 3385, Tulsa, OK 74102, USA. Presently Consultant, Tulsa, OK, USA. |
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| Abstract: | Seismic exploration in mountainous areas imposes serious compromises on both acquisition and processing. Access restrictions usually result in profiles that are not straight and are not recorded along the true dip direction (if there is a true dip direction!). Processing constraints often result in very poor approximate corrections for elevations and for deviations from a straight line. Most fundamentally, 2D acquisition and processing assumes that the earth is 2D; this assumption is often seriously violated in mountainous areas. While we cannot efficiently correct 2D seismic data for the effects of a fully 3D subsurface, we can improve the data quality in thrust areas where the assumption of 2D subsurface variation is reasonable. We do this in a series of small steps, which improves the accuracy of several approximations made in processing 2D land data. |
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