Abstract: Prestack depth migration has become an effective approach to solving seismic imaging problems in complex area. However, it is more sensitive to velocity as compared with prestack time migration, which constrains its application. Dabei area is located in the west of Kelasu structure belt of Kuqa Depression, Tarim Basin, where seismic imaging is very difficult because of complicated topography and subsurface structure. This paper introduces the integration of procession and interpretation, and the prestack depth migration velocity modeling method under multi-constraints. Based on the integration and application of surface investigation, tomographyic inversion, well constraints, non-seismic data and other information, velocity field is built, and then anisotropic prestack depth migration is used to image complicated structure. It has successfully solved the imaging problem in the area.

Key words: velocity modeling under multi-constraints, anisotropic analysis, prestack depth migration, Kuqa area