Summary

Seismic diffraction imaging is recognized as a rapidly emerging technology with great potential to detect small subsurface geologic features with improved resolution relative to conventional seismic reflection imaging. Correct identification and separation of diffraction events from the full wavefield are important for diffraction imaging. Different approaches have been developed for diffraction extraction, and two of the most famous techniques are anti-stationary phase filtering and reflection apex removal in the migrated dip-angle domain. We use a simple sag model and a field data set from the vintage Gulf of Mexico (Claerbout, 2005) as examples to illustrate the separation process of both methods, and compare the effectiveness of each approach in imaging diffraction objective. Results demonstrate that diffraction imaging by anti-stationary phase filtering can give a clearer section with relatively high resolution as fewer migration artifacts exist.

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