Residual dip moveout in VTI media

Dip-moveout (DMO) correction is often applied to common-offset sections of seismic data using a homogeneous isotropic medium assumption, which results in a fast execution. Velocity-residual DMO is developed to correct for the medium-treatment limitation of the fast DMO. For reasonable-sized velocity perturbations, the residual DMO operator is small, and thus is an efficient means of applying a conventional Kirchhoff approach. However, the shape of the residual DMO operator is complicated and may form caustics. We use the Fourier domain for the operator development part of the residual DMO, while performing the convolution with common-offset data in the space-time domain. Since the application is based on an integral (Kirchhoff) method, this residual DMO preserves all the flexibility features of an integral DMO. An application to synthetic and real data demonstrates effectiveness of the velocity-residual DMO in data processing and velocity analysis.