Residual post-stack migration operators can be obtained by
generating synthetic data for a model consisting of diffractors for
given medium parameters and then migrating the same data with
different medium parameters. For example, we can generate
diffractions for isotropic media and migrate those diffractions
using an anisotropic migration. The resultant operator describes
the correction needed to transform an isotropically migrated
section to an anisotropic one, that is the
*anisotropic residual migration* operator.

Figure 1

Figure 1 shows such synthetic operators overlaid by kinematically calculated operators that were computed with the help of equation (19) (the continuation equations for the case of small ). Despite the inherent accuracy of the synthetic operators, they suffer from the lack of aperture in modeling the diffractions, and therefore, beyond a certain angle the operators vanish. The agreement between the synthetic and calculated operators for small angles, especially for the case, promises reasonable results in future dynamic implementations.

11/11/1997