Migração usando equação da onda unidirecional de abertura arbitrária
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...
| Autor principal: | COSTA, Lúcio Alan Pires da |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Pará
2014
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.ufpa.br/jspui/handle/2011/5973 |
| Resumo: |
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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. |