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Processing
Parameters and Post Processing Hybrid Visualization Products
WELPER, OTTO J. , Integrated Seismic Solutions, Houston, TX
This talk details the use of Coherence cube visualization as an
additional quality control tool to define processing parameters. In addition, combining
other attributes in the coherence measurement can form custom visualization cubes.
Traditionally, processing analysts quality control 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
processing improvements or see depositional environments.
Migrating and producing a coherence cube on each step within the processing 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 processing parameters which are not apparent by viewing inlines and
crosslines alone. Some of the processes are: geometry, statics, 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.
AAPG Search and Discovery Article #90908©2000 GCAGS, Houston, Texas