| Journal: | Revista brasileira de geofisica |
| Database: | PERIÓDICA |
| System number: | 000338766 |
| ISSN: | 0102-261X |
| Authors: | Vivas, Flor A1 Pestana, Reynam C1 |
| Institutions: | 1Universidade Federal da Bahia, Curso de Pos-Graduacao em Geofisica, Salvador, Bahia. Brasil |
| Year: | 2007 |
| Season: | Ene-Mar |
| Volumen: | 25 |
| Number: | 1 |
| Pages: | 51-62 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | The true-amplitude one-way wave equation suggested recently is both dynamically and kinematically correct. This one-way wave equations produces accurate traveltime in accordance to the eikonal equation and accurate amplitudes in accordance to the transport equation for the two-way wave equation. In laterally inhomogeneous media the implementation of this true-amplitude one-way wave equation involves the numeric calculation of a differential-integral operator that can be approximated by summation and solved by finite-difference methods. In only depth-dependent media, the new term in the one-way wave equation can be eliminated and the new one-way wave equations can be solved using the conventional phase-shift method with the appropriated boundary and imaging condition, reduced to products in the Fourier domain. Here, we present an extension of phase shift plus interpolation (PSPI) migration for true-amplitude migration based in the phase-shift true-amplitude migration developed in depth-dependent media. Numerical tests in the common shot domain with the new PSPI true-amplitude method and the Extended split-step PSPI-SS proposed were compared with the output of the conventional PSPI and PSPI-SS. The imaging quality in relation to amplitude is better with the proposed methods and the kinematic part is preserved |
| Portuguese abstract | As equacoes da onda unidirecionais com amplitude verdadeira, propostas nos trabalhos mais recentes, levam em conta de forma correta a parte cinematica e dinamica da equacao completa da onda equivalentemente as obtidas a partir da aproximacao de altas frequencias. Isto e, as equacoes iconal e de transporte obtidas para estes operadores se correspondem com as obtidas com a equacao completa da onda. Num meio com variacao lateral de velocidade, a implementacao das equacoes unidirecionais com amplitude verdadeira envolve o calculo numerico de operadores integro-diferenciais que podem ser aproximados por somat´orios e resolvidos por tecnicas de diferencas finitas |
| Disciplines: | Geociencias, Física y astronomía |
| Keyword: | Geofísica, Física, Migración sísmica, Ecuaciones unidireccionales, Ondas sísmicas |
| Keyword: | Earth sciences, Physics and astronomy, Geophysics, Physics, Seismic migration, One-way equations, Seismic waves |
| Full text: | Texto completo (Ver PDF) |
