Angle-gathers by Fourier Transform

Paul Sava and Sergey Fomel

paul@sep.stanford.edu, sergey@sep.stanford.edu

ABSTRACT

In this paper, we present a method for computing angle-domain common-image gathers from wave-equation depth-migrated seismic images. We show that the method amounts to a radial-trace transform in the Fourier domain and that it is equivalent to a slant stack in the space domain. We obtain the angle-gathers using a stretch technique that enables us to impose smoothness through regularization. Several examples show that our method is accurate, fast, robust, easy to implement and that it can be used for real 3-D prestack data in applications related to velocity analysis and amplitude-versus angle (AVA) analysis.