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CONCLUSION

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.


previous up next print clean
Next: REFERENCES Up: Crawley: Antialiasing Previous: ALIASING & COVERAGE
Stanford Exploration Project
11/11/1997