DIP-CORRECTION FOR COHERENCE-BASEDMIGRATION VELOCITY ANALYSIS

摘要

Migration velocity analysis (MVA) is a seismic processing step that aims at translating the velocity informa-tionthat is contained in the residual moveout in an image gather after migration with an erroneous velocitymodel into velocity updates. In this paper, we extend the original coherence-based MVA approach to dippingreflectors. We devise a new MVA technique, where the reflector dip is treated as an additional search param-eterthat is to be detected together with the velocity updating factor. A numerical example demonstrates thatthe additional search parameter can indeed be helpful to improve the quality of the velocity updates.