--> Abstract: Some Case Histories of AVO Failures in the Texas Gulf Coast, by J. L. Allen and C. P. Peddy; #90987 (1993).
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ALLEN, JAMES L. and CAROLYN P. PEDDY, Houston Advanced Research Center, Houston, TX

ABSTRACT: Some Case Histories of Previous HitAVONext Hit Failures in the Texas Gulf Coast

Five case histories illustrate some of the pitfalls in using Previous HitamplitudeNext Hit-Previous HitversusNext Hit-Previous HitoffsetNext Hit (Previous HitAVONext Hit) Previous HitanalysisNext Hit to evaluate bright spots in the Texas Gulf Coast. The extension of an Previous HitAVONext Hit anomaly downdip of a gas/water contact was probably caused by Fresnal zone effects. A clean thick wet sand and a lignite caused the bright spots and Previous HitAVONext Hit anomalies in two examples. A shallow bright spot might have been rejected by a geophysicist who saw a decrease in Previous HitAVONext Hit, but modeling of the well logs indicate that array effects can explain the observed Previous HitAVOTop response. A fifth case history has no easy explanation.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.