Sampling Issues in Delayed-Shot Migration and Plane-Wave Migration

We discussed the sampling issues for delayed-shot migration and plane-wave migration in a marine single streamer environment. For delayed-shot migration, when the migration input data has unaliased receiver records with enough cable length, there is sufficient coupling between shots in the inline direction for a physically realizable line source to be synthesized, and we can use fewer px’s to produce good images than would be required to construct unaliased impulse response images. On the other hand, conventional narrow swath marine acquisition presents an additional aliasing problem in the post-migration stack step for plane-wave migration, requiring a larger number of py-values. Delayed-shot migration seems more attractive for current narrow azimuth marine acquisition. However, a 3-D plane-wave migration may be a good candidate for migrating wide azimuth data.