Abstract: In the wave equation depth migration of common shot gathers,the windowed Fourier frame expansion of seismic wavefield is used to obtain the receiver and source wavefields in the local angle domain.We propose a wave equation migration method in angle domain for common shot gathers seismic data.With migration in angle domain,the image matrix in local angle domain,the migration sections with different common-dip angles and reflection angles at imaging points are obtained.It provides fundamental data for processing approaches based on migration,such as analysis of amplitude versus angle,extraction of common image gather in angle domain and velocity analysis in angle domain. Numerical examples in a steep dip model and an international standard Marmousi model show that the wave equation migration method in angle domain is correct and effective.

Key words: wave equation, windowed Fourier frame expansion, local angle domain, migration, stratum dip angle, reflection angle