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Previous Hit3-DNext Hit Imaging Beneath Water-Bottom Channels in the Gippsland Basin: A Case Study

K. T. Jerry Young, William A. Schneider Jr., Becky G. Houston, Roy E. Clark Jr., and John R. Moore

Water-bottom channels in the Gippsland Basin cause nonhyperbolic moveout and time delays resulting in disrupted and distorted structural images on time sections. In Previous Hit3-DNext Hit processing, prestack depth Previous HitmigrationNext Hit is the ultimate processing technique for resolving nonhyperbolic moveout and producing correct depth images. But, the high cost and slow turnaround time of Previous Hit3-DNext Hit prestack depth Previous HitmigrationNext Hit limits its application. An alternative Previous Hit3-DNext Hit processing approach, consisting of prestack Previous Hit3-DNext Hit replacement dynamics, stacking, Previous HitpoststackNext Hit inverse Previous Hit3-DNext Hit replacement dynamics, and Previous Hit3-DNext Hit Previous HitpoststackNext Hit depth Previous HitmigrationNext Hit, was applied to a Previous Hit3-DNext Hit survey located near the shelf-slope edge of the Gippsland Basin.

Application of Previous Hit3-DNext Hit replacement dynamics reduced nonhyperbolic moveout caused by variable water depth and improved the quality of stacked traces. We found that the interval velocity distribution below the sea floor is largely controlled by compaction or depth below the sea floor. Previous HitPoststackNext Hit depth Previous HitmigrationNext Hit, with a compaction-based velocity field, removed the structural distortion beneath the channels, resulting in an accurate Previous Hit3-DTop depth image.

AAPG Search and Discover Article #91019©1996 AAPG Convention and Exhibition 19-22 May 1996, San Diego, California