Abstract：Theoretically,prestack depth migration is the most correct one of seismic migration methods.Phase shift plus correction can be used to achieve 2-D prestack depth migration of common-shot seismic data in the case of complicated geologic model in which velocity varies laterally and vertically.This method includes both phase shift and correction of local velocity variation factor,and determines source function by automatic wavelet statistics.As a result,this method is not limited information dip angle,but copes with the azimuthal velocity variation in complicated geologic structures.Theoretical and real processing results show that this method brings good data processing accuracy and high signal jnoise ratio.Velocity model causes direct influence upon depth migration effect.Our interactive batch velocity estimation offers accurate migration velocity model.The estimation can fast bring accurate equivalent migration velocity and interval velocity because it is based on prestack depth migration and uses global optimization genetic algorithm.By using the velocity model constructed with this method,we can obtain the depth migration section whose seismic horizons coincides with drilled geologic horizons desirably.Theoretical and real processing results prove this method very feasible.
