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Prestack Kirchhoff datuming is difficult in 3D, because recording
geometries are such that it is likely not obvious how to antialias
the operator.
Because shot and receiver spacings are often significantly different
along different spatial axes, bandpassing the operator will effectively
suppress all energy moving in the poorly sampled directions.
Operator bandwidth can be safely increased, and frequencies preserved
above the spatial nyquist, for a limited range of time dips.
Diffractors and dipping reflectors create conflicting time dips in
shot and receiver profiles, but not in common midpoint gathers,
so we should be able to preserve some reasonable bandwidth by
datuming in midpoint and offset.
Reformulating the datuming operator in midpoint and offset adds
complexity and computational expense, but will hopefully also
add considerable utility.
This is an easy concept to illustrate with shots and receivers;
making a more general, useful operator, in midpoints and offset, is
the next challenging step.
Next: REFERENCES
Up: Crawley: Antialiasing
Previous: ALIASING & COVERAGE
Stanford Exploration Project
11/11/1997