Seismic diffractions contain valuable information of small objects underground. The main porosities in carbonate reservoirs with secondary storage space are dissolution caves and fractures, which generate diffraction waves. Therefore, it is valuable to research on diffraction separately. There exists a significant distinction between seismic diffractions and reflections in the post-migration dip-angle domain CRP. The difference response in dip-angle gather between the two types of waves is analyzed, and a flexible approach, which can separate the diffraction from refection efficiently, is described and illustrated in this abstract. The corresponding responses of diffraction and reflection in dip-angle gather for 2D and 3D cases are derived. This approach is proven to be effective and stable by applying it to two physical models data.


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