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The AAPG/Datapages Combined Publications Database

Houston Geological Society Bulletin

Abstract


Houston Geological Society Bulletin, Volume 27, No. 1, September 1984. Pages 4-4.

Abstract: Previous HitSeismicNext Hit Previous HitModelingNext Hit: Geological Predictions and Pitfalls

By

Fred J. Hilterman

Previous HitSeismicNext Hit sections across most geological structures are distorted by sideswipe and/or lateral velocity changes in the subsurface. Invariably, the distortion on the 20 migrated section hides the features that are most desired. However, through Previous HitseismicNext Hit models of similar geological structures, the interpretational pitfalls caused by sideswipe and velocity are turned into practical prediction tools.

Migrated Previous HitseismicNext Hit lines across-domes and anticlines normally exaggerate the size of the anomalies. Migrated Previous HitseismicNext Hit lines across synclines and basins are characterized with false expressions which include grabens, contemporaneous deformation, cross-stratification, high-amplitudes, and crossing reflections. Geological areas that have large lateral velocity contrasts, such as reefs, diapirs, or fault blocks exhibit false Previous HitseismicNext Hit expressions. These include relief faults, basement controlled tectonics, facies changes, and structures which are located in geologically ambiguous positions. Even the polarity of the Previous HitseismicNext Hit reflection is 3D dependent.

Previous HitModelingNext Hit examples show that interpretational pitfalls, such as mapping from migrated sections and interpreting from the basement upward, must be supplemented with pseudo-3D interpretational techniques. Geologic models and their Previous HitseismicTop analyses from salt provinces, reefs, overthrusts, etc., illustrate these pseudo-3D interpretational tools.

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