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The AAPG/Datapages Combined Publications Database

Wyoming Geological Association

Abstract


Resources of Southwestern Wyoming; Field Conference Guidebook, 1995
Pages 77-88

Three-Dimensional Previous HitDepthNext Hit Imaging of Seismic Data, with Examples from the Overthrust Belt of Southwestern Wyoming

Alvin K. Benson

Abstract

Seismic data from the Overthrust Belt of southwestern Wyoming should typically be Previous HitdepthNext Hit imaged in 3-D. A simplified thrust model is studied to illustrate (a) the complications produced by rapid lateral Previous HitvelocityNext Hit changes, Previous HitvelocityNext Hit pull-up, etc., and (b) the necessity of Previous HitusingNext Hit a Previous HitdepthNext Hit imaging process versus time imaging plus conversion to Previous HitdepthNext Hit in complex geological areas. Two case studies from southwestern Wyoming are examined todemonstrate new methods that provide improved images of seismic data. For both cases, stacking velocities were initially used to derive interval velocities for modeling, but this led to incorrect, contradictory geology. Subsequently, Previous HitvelocityNext Hit information from available well logs helped produce much-improved Previous HitdepthNext Hit models for the Previous HitdepthNext Hit imaging process. When a grid of data is available, the imaging is typically done in 3-D.

In the second case study, a 2-D Previous HitdepthNext Hit-imaged section leaves unexplained, crossing events due to seismic energy coming from out-of-the-plane. Subsequently, a two-pass, 3-D Previous HitdepthNext Hit image was produced, which provides the "best" Previous HitdepthNext Hit image, and the final interpretation, as confirmed by drilling, is much closer to reality. The objective of Previous HitdepthNext Hit imaging, and when the data are available, 3-D Previous HitdepthTop imaging, is to produce as accurate a picture of the actual geology of the earth as possible in areas of complicated geological structures.


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