Abstract：Prestack depth migration is the most effective method for deepwater complex seafloor. This method can restore contorts and distortion of the subsurface caused by rough ocean bottom, and show true structures. At the same time it can solve bow-tie-effects in prestack time migration. However, due to the anisotropy of medium, seismic velocity changes with different incident angles. The isotropic depth migration often results in large depth errors with well logs. And the common imaging gathers are not flattened at far offsets. Therefore, anisotropic prestack depth migration shall be applied in deepwater seismic data processing. In this paper anisotropic prestack depth migration is applies to seismic data in South China Sea. In this paper, we focus on initial velocity field building and anisotropic parameter analysis, and analyze results of the anisotropic depth migration in the deep water area.
