Common-shot prestack Gaussian beam depth migration in anisotropic media

Abstract

As an important method of improving the seismic imaging quality in lateral velocity change and complex areas, prestack depth migration has played an important role in the oil and gas exploration. For the common prestack depth migration methods, the image accuracy and computational efficiency are often difficult to get at the same time. Prestack Gaussian beam depth migration is an improved integral method. It not only overcomes the low precision of traditional ray-based migration, and also retains high computational efficiency and the steep-dip imaging capability of Kirchhoff integral method. If we ignore the influence of anisotropy in the anisotropic areas, it will cause inaccurate imaging phenomena. By modifying the ray tracing system in this paper we extended prestack Gaussian beam depth migration method from isotropic media into anisotropic media, and used the standard VTI SEG/HESS model verify the correctness and validity of the method.