IMPROVING Q ESTIMATES FROM SEISMIC REFLECTION DATA USING WELL-LOG-BASED LOCALIZED SPECTRAL CORRECTION
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dc.contributor.author | Hackert C.L. | |
dc.contributor.author | Parra J.O. | |
dc.date.accessioned | 2022-10-24T08:25:17Z | |
dc.date.available | 2022-10-24T08:25:17Z | |
dc.date.issued | 2004 | |
dc.identifier | https://elibrary.ru/item.asp?id=14660057 | |
dc.identifier.citation | Geophysics, 2004, 69, 6, 1521-1529 | |
dc.identifier.issn | 0016-8033 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39059 | |
dc.description.abstract | Most methods for deriving Q from surface-seismic data depend on the spectral content of the reflection. The spectrum of the reflected wave may be affected by the presence of thin beds in the formation, which makes Q estimates less reliable. We incorporate a method for cor-recting the reflected spectrum to remove local thin-bed effects into the Q-versus-offset (QVO) method for de-termining attenuation from seismic-reflection data. By dividing the observed spectrum by the local spectrum of the known reflectivity sequence from a nearby well log, we obtain a spectrum more closely resembling that which would be produced by a single primary reflector. This op-eration, equivalent to deconvolution in the time domain, is demonstrated to be successful using synthetic data. As a test case, we also apply the correction method to QVO with a real seismic line over a south Florida site contain-ing many thin sandstone and carbonate beds. When cor-rected spectra are used, there is significantly less variance in the estimated Q values, and fewer unphysical negative Q values are obtained. Based on this method, it appears that sediments at the Florida site have a Q near 33 that is roughly constant from 170-to 600-m depth over the length of the line. | |
dc.title | IMPROVING Q ESTIMATES FROM SEISMIC REFLECTION DATA USING WELL-LOG-BASED LOCALIZED SPECTRAL CORRECTION | |
dc.type | Статья |
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