Non-Hyperbolic Velocity Analysis of Seismic Data from Jequitinhonha Basin, Northeastern Brazil



Título del documento: Non-Hyperbolic Velocity Analysis of Seismic Data from Jequitinhonha Basin, Northeastern Brazil
Revista: Anais da Academia Brasileira de Ciencias
Base de datos: PERIÓDICA
Número de sistema: 000436251
ISSN: 0001-3765
Autores: 1
1
2
2
Instituciones: 1Universidade Federal da Bahia, Instituto Nacional de Ciencia e Tecnologia de Geofisica do Petroleo, Salvador, Bahia. Brasil
2Universidade Federal do Para, Programa de Pos-Graduacao em Geofisica, Belem, Para. Brasil
Año:
Volumen: 92
Número: 1
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Analítico, descriptivo
Resumen en inglés Normal moveout (NMO) velocity is used in seismic data processing to correct the data from the moveout effect. This velocity depends on the medium above the reflector and it is estimated from the adjustment of a hyperbolic function that approximates the reflection time. This approximation is reasonable for media formed by isotropic layers. For deeper exploration targets, which effectively behave as anisotropic media, the NMO velocity estimate from the hyperbolic approximation becomes imprecise. One possibility is the use of non-hyperbolic approximations for the reflection time and deeming the medium to be anisotropic. However, these approximations make the NMO velocity estimation a more complex problem, since the anisotropic parameters are unknown. In this study the NMO velocities for a vertical transverse isotropy medium are estimated using two non-hyperbolic reflection time approaches. For comparing the two methodologies that estimate NMO velocity, a 2-D dataset from Jequitinhonha Basin is used and it presents anisotropic behavior. The results show that this approach produces more consistent results than the conventional approach, which ignores the anisotropy of the medium
Disciplinas: Geociencias
Palabras clave: Sismología y vulcanología,
Datos sísmicos,
Medios anisotrópicos,
Tiempo de reflexión no-hiperbólico
Keyword: Seismology and volcanology,
Seismic data,
Non-hyperbolic reflection time,
Anisotropic media
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