| Journal: | Revista brasileira de geofisica |
| Database: | PERIÓDICA |
| System number: | 000339386 |
| ISSN: | 0102-261X |
| Authors: | Mitrofanov, Georgy1 Priimenko, Viatcheslav Ivanovich2 |
| Institutions: | 1Russian Academy of Sciences, Institute of Geology and Geophysics, Novosibirsk. Rusia 2Universidade Estadual do Norte Fluminense, Laboratorio de Engenharia Petrolera e Exploracao, Macae, Rio de Janeiro. Brasil |
| Year: | 2010 |
| Season: | Dic |
| Volumen: | 28 |
| Number: | 4 |
| Pages: | 657-671 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, teórico |
| English abstract | This article discusses aspects of practical application of the solution to inverse seismic problems based on 1D elastic models of the medium. In order to better fit the 1D models to real observations we propose using a structural decomposition. It allows us to transform the wave field, corresponding to a 3D model, to the wave field, corresponding to a set of local 1D models with “ideal” conditions of seismic oscillations excitation and registration. As a result, a new system of observations in the form of “pseudo” seismograms, which are used during the transition into spectral domain for the solution of the corresponding inverse problem, can be available. In addition, the decomposition of waveforms corresponding to the target object is carried out in the spectral domain. This decomposition allows to eliminate variations in the waveform associated with the changes in the conditions of seismic oscillations excitation and registration, as well with the passage through the overlying medium. In particular, it takes into account the change in the waveform due to differences in the radiation patterns of the real source for different angles of arrival to the target object |
| Portuguese abstract | Este artigo discute aspectos da aplicacao pratica da solucao de problemas inversos sısmicos, baseados em modelos elasticos 1D de meio. A fim de melhor ajustar os modelos a observacoes reais, propomos utilizar uma decomposicao estrutural, que permite transformar o campo de onda, correspondente a um modelo 3D, ao conjunto de dados, correspondentes a modelos 1D locais, com condicoes “ideais” de excitacao e registro das oscilacoes s´ısmicas. Formando novos dados na forma de “pseudo” sismogramas, que sao usados durante a transic¸ao no domınio espectral para a construcao da solucao do problema inverso correspondente. Alem disso, a decomposicao de formas de ondas correspondentes ao objeto alvo e realizada no domınio espectral. Esta decomposicao permite eliminar as variacoes na forma de onda, associadas a mudancas nas condicoes de excitacao e registro das oscilacoes sısmicas, bem como com a passagem pela parte superior da secao geologica. Em particular, esta decomposicao leva em conta a mudanca na forma de onda, devido a diferenc¸as nas caracterısticas de orientacao da fonte real para diferentes angulos de chegada ao objeto alvo |
| Disciplines: | Geociencias |
| Keyword: | Geofísica, Observaciones sísmicas, Datos sísmicos, Modelos tridimensionales, Dominio espectral, Descomposición estructural |
| Keyword: | Earth sciences, Geophysics, Seismic observations, Seismic data, Three-dimensional models, Spectral dominion, Structural decomposition |
| Full text: | Texto completo (Ver PDF) |
