--> ABSTRACT: Geophysical Imaging of Subsalt Geology, by Davis W. Ratcliff and David J. Weber; #91019 (1996)
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Geophysical Previous HitImagingNext Hit of Previous HitSubsaltNext Hit Geology

Davis W. Ratcliff and David J. Weber

Exploration and production of huge Previous HitsubsaltNext Hit hydrocarbon accumulations in the Previous HitGulfNext Hit of Previous HitMexicoNext Hit has been an ambitious challenge for many explorationists throughout the industry. The complexities associated with the three dimensional nature of salt structures, as well as the highly deformed tops and bottoms of salt, demand 3-D Prestack Depth Migration (3-D PreSDM) technology in order to correctly stack and position reflectivity below salt. Application of "large-volume" 3-D PreSDM techniques has been, and will continue to be, instrumental in unraveling the structural and stratigraphic complexities of the Previous HitsubsaltNext Hit environment. "Large-volume" 3-D PreSDM technology allows the explorationist to better assess Previous HitsubsaltNext Hit exploration and development risk, as well as improve Previous HitsubsaltNext Hit explora ion success.

In this paper, we discuss a full-volume 3-D PreSDM case study that, to our knowledge, is the largest prestack depth Previous HitimagingNext Hit project ever attempted, to date. The 3-D PreSDM case study is centered over the Mahogany Discovery in the Previous HitGulfNext Hit of Previous HitMexico'sNext Hit Ship Shoal South Addition Block 349 area. Information about input and output data coverage, computer run times and 3-D depth Previous HitimagingNext Hit strategies will be discussed. Numerous examples of closely spaced 3-D prestack depth migrated seismic data will also be shown in order to demonstrate how "large-volume" 3-D PreSDM technology improves Previous HitsubsaltNext Hit Previous HitimagingNext Hit, (both structural and stratigraphic), as well as Previous HitsubsaltTop prospecting.

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