In order to probe the relationships between wave equation offset domain common image gathers (ODCIGs)/angle domain common image gathers (ADCIGs) with migration velocity, we quantitatively derive the changes of ODCIGs and ADCIGs along with migration velocity on the assumption of uniform velocity medium with a horizontal reflector.

Common-reflection-surface stacking and its application in migration imaging;

The conventional migration for 3-D VSP seismic data resorts to the use of Kirchhoff integral,which is based on the ray theory,to be implemented in common shot point gather.

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.

Mixed-domain one-way wave propagator and its application in migration image;

Man-made boundary in forward computation and migration image using finitedifference of wave equation must result in boundary reflection waves to damage theeffects of forward computation and migration image.

Because the conventional Rytov approximation Fourier migration method cannot accurately image the media with acute lateral variation of velocity, a Rytov approximation Fourier migration method with variable reference slowness was proposed to theoretically solve the migration image of the arbitrary velocity change model.