Abstract：In this paper,a prestack depth migration method based on Rytov approximation is carried out in frequency-wavenumber domain and frequency-space domain,and is used to process common shot gather data for Marmousi model in 2-D space.Through comparison with split-step Fourier migration method and phase-screen migration methods,we considered that the prestack depth migration method based on Rytov approximation not only can produce better migration result than previous two methods,but also can better handle lateral velocity variation.During calculation of scattered wavefield,we use a more stable formula for scattered wavefield than that used by Huang Let al.It extends the range of Rytov approximation,and makes the prestack depth migration method based on Rytov approximation can adapt strong lateral velocity variation.
