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Chevron (operator), Teikoku Oil, and Unocal hold the offshore Zaire concession, West Africa. Recently, Unocal performed an anisotropic 3-D prestack depth migration in an attempt to optimally image tilted fault blocks in the presalt section. Depth migration was required because large-displacement faults juxtaposed a high-velocity massive carbonate and a low-velocity marl. Large compressional-wave anisotropy caused by thin layering was inferred for most of the depth section. Evidence on the nature and magnitude of the anisotropy came from comparing stacking velocities with well velocities analyzing a multioffset vertical seismic profile (VSP) thin-layer modeling in the massive carbonate using well log...

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