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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 50 (2000), Pages 485-494

The Use of Coherence Cube Visualization in Picking Seismic Previous HitProcessingNext Hit Parameters and Post Previous HitProcessingNext Hit Hybrid Visualization Products

Otto J. Welper

Abstract

This talk details the use of Coherence cube visualization as an additional Q.C. tool to define Previous HitprocessingNext Hit parameters. In addition, combining other attributes in the coherence measurement can form custom visualization cubes.

Traditionally, Previous HitprocessingNext Hit analysts Q.C. their product by displaying inlines and crosslines from a 3D volume either on paper or interactively on their computer screen. The third dimension in a 3D volume is an amplitude slice. The amplitude slice, while offering a different view of our seismic data, does very little to help us understand Previous HitprocessingNext Hit improvements or see depositional environments.

Migrating and producing a coherence cube on each step within the Previous HitprocessingNext Hit sequence has given us a way to view a third dimension of our seismic data as a coherence time slice or a horizon slice. By viewing the data in this fashion we are able to see subtle differences in Previous HitprocessingNext Hit parameters which are not apparent by viewing inlines and crosslines alone. Some of the processes are: geometry, static's, dmo, migration velocity evaluation, migration algorithm evaluation and signal to noise evaluation.

The final result of this evaluation is normally a pre-stack time migrated seismic volume and a final coherence volume. Depending on the geology, we are able to combine other seismic attributes with coherence measurements to directly define hydrocarbons or define facies changes such as the boundary between sand and shale.

The paper details the use of coherence cube visualization as an additional Previous HitqualityNext Hit Previous HitcontrolNext Hit tool to define Previous HitprocessingNext Hit parameters. The added resolution that coherence cube gives us in the time slice and horizon slice domain allows us to see subtle differences in Previous HitprocessingNext Hit parameters which are not always readily apparent while looking at conventional displays of our seismic inlines and crosslines. The detailed examples will show the benefits and power of using coherence cubes to visualize the data during each step of the Previous HitprocessingNext Hit sequence.


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