Migração usando equação da onda unidirecional de abertura arbitrária

Abstract

The arbitrarily wide angle wave equations are applied to post-stack migration. This class of wavefield continuation operators are based on the concept of semi-space stiffness, Dirichlet to Neumann transformations and its discretization using finite elements. The specification of the continuation operator requires auxiliar variables. The number of these variable increase with the maximum angular aperture. The algorithm is implemented in space-frequency domain which allows straightforward parallelization. Based on numerical experiments using the dispersion relation and the impulse response of these operators we prescribe the number of auxiliar variables and downward continuation step. The migration of the zero offset SEG-EAGE data using the wide angle continuation operators shows their efectiveness for imaging steep dips in a complex velocity model.