Three Dimensional Generalized Nonhyperbolic Moveout Approximation - Application on a 3D HTI Model

Reflection moveout approximation is widely used for seismic modeling, velocity analysis, time migration etc. However, most of existed approximations are developed for 2D case. We propose a three-dimensional generalized nonhyperbolic moveout approximation (GMA). It is called generalized approximation because it follows the 2D counterpart proposed by Fomel and Stovas. In our approximation, thirteen parameters are determined from the zero-offset reference ray and two non-zero offset reference rays. By testing the accuracy of the proposed approximation in a 3D HTI model, we find that the accuracy of our 3D GMA is very good.