Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/68012
Type: Artigo de periódico
Title: GEOMETRICAL SPREADING CORRECTIONS OF OFFSET REFLECTIONS IN A LATERALLY INHOMOGENEOUS EARTH
Author: TYGEL, M
SCHLEICHER, J
HUBRAL, P
Abstract: Compressional primary seismic nonzero offset reflections are the most essential wavefield attributes used in seismic parameter estimation and imaging. We show how the determination of angle-dependent reflection coefficients can be addressed from identifying such events for arbitrarily curved three-dimensional (3-D) subsurface reflectors below a laterally inhomogeneous layered overburden. More explicitly, we show how the geometrical-spreading factor along a reflected primary ray with offset can be calculated from the identified (i.e., picked) traveltimes of offset primary reflections. Seismic traces in which all primary reflections are corrected with the geometrical-spreading factor are, as is well-known, referred to as true-amplitude traces. They can be constructed without any knowledge of the velocity distribution in the earth model. Apart from possibly finding a direct application in an amplitude-versus-offset (AVO) analysis, the theory developed here can be of use to derive true-amplitude time- and depth-migration methods for various seismic data acquisition configurations, which pursue the aim of performing the wavefield migration (based upon the use of a macro-velocity model) and the AVO analysis in one step.
Editor: Soc Exploration Geophysicists
Rights: aberto
Identifier DOI: 10.1190/1.1443317
Date Issue: 1992
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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