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Type: Artigo de periódico
Title: A fourth-order CRS moveout for reflection or diffraction events: Numerical examples
Author: Chira-Oliva, P
Tygel, M
Hubral, P
Schleicher, J
Abstract: Traveltime moveout expressions that can well stack reflection and diffraction events are of prime interest for the imaging and inversion of seismic data. In recent years, the classical hyperbolic single-parameter normal-moveout/dip-moveout (NMO/DMO) stacking formula applied to common-midpoint (CMP) data is being replaced by new moveout expressions that make use of more parameters and allow for arbitrary measurement configurations. The advantages of the new stacking formulas are twofold. Firstly, they can fully use all the available multi-coverage data, as the source-receiver symmetry condition of the CMP configuration is no longer required. Secondly, the various parameters that are obtained by coherence analysis directly applied to the multi-coverage data are very useful for further imaging and inversion procedures. We review a fourth-order traveltime formula and examine its ability to approximate reflections or diffractions. This formula depends on the same three parameters as the hyperbolic traveltime used in the Common-Reflection-Surface (CRS) method. Synthetic examples have shown a better performance of the proposed expression compared to the second-order hyperbolic traveltime: it is more accurate within a larger aperture size.
Subject: traveltime parameterization
fourth-order moveout
CRS stack
Country: França
Editor: Geophysical Press
Citation: Journal Of Seismic Exploration. Geophysical Press, v. 12, n. 3, n. 197, n. 219, 2003.
Rights: fechado
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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