Depth focusing analysis for 3-D migration velocity estimation

Hermes Malcotti and Biondo Biondi

hermes@sep.stanford.edu, biondo@sep.stanford.edu

ABSTRACT

We present partial results of the implementation of 3D depth focusing velocity analysis, based on 2-D and 3-D prestack downward continuation algorithm in the CMP domain. We discuss the focusing analysis methodology for point diffractors in a constant velocity media. In addition, we discuss the 2-D and 3-D kinematic bases of 3D focusing analysis and the implicit approximations of depth focusing analysis technique. We show the depth error panels resulting from using diffractors points and discuss the differences between the depth error gather obtained by a 2-D and 3-D downward continued operator.