Two-way vs. one-way: Understanding the approximations

Alejandro A. Valenciano

valencia@sep.stanford.edu

ABSTRACT

The one-way wave-equation approximation has a big impact on migration, modeling, and wave-equation inversion. That is why Amplitude vs. subsurface-offset (AVO), and amplitude vs. reflection angle (AVA) responses of the migration of a two-way and a one-way modeled datasets show different illumination patterns. Deconvolution by the one-way wave-equation Hessian can be use to account for the illumination problem. But the approximations used to compute the Hessian have an impact on how effectively the medium AVO and AVA is recover by the inversion.