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Operator aliasing in wavefield continuation migration

Brad Artman, Jeff Shragge, and Biondo Biondi

brad@sep.stanford.edu, jeff@sep.stanford.edu, biondo@sep.stanford.edu

ABSTRACT

With the widespread adoption of wavefield continuation methods for prestack migration, the concept of operator aliasing warrants revisiting. While zero-offset migration is unaffected, prestack migrations reintroduce the issue of operator aliasing. Some situations where this problem arises include subsampling the shot-axes to save shot-profile migration costs and limited cross-line shot locations due to acquisition strategies. These problems are overcome in this treatment with the use of an appropriate source function or band-limiting the energy contributing to the image. We detail a synthetic experiment that shows the ramifications of subsampling the shot axis and the efficacy of addressing the problems introduced with our two approaches. Further, we explain how these methods can be tailored in some situations to include useful energy residing outside of the Nyquist limits.



 
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Stanford Exploration Project
7/8/2003