Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/241939
Type: Artigo
Title: Prestack time-migration velocity analysis using remigration trajectories
Author: Santos, Henrique B.
Coimbra, Tiago A.
Schleicher, Jörg
Novais, Amélia
Abstract: We have developed a prestack time-migration tool for local improvement of the seismic migration-velocity model. The method is based on remigration trajectories that describe the position of an image point in the image domain for different source-receiver offsets as a function of the migration velocity. It determines kinematic migration parameters using local-slope information of migrated seismic reflection events. These parameters, in turn, are used to locally correct the velocity model. The main advantage of this technique is that it allows us to carry out a moveout correction not just at a fixed point in a zero-offset (poststack) time-migrated gather, but varying through all offsets of a common-image gather, taking into account the reflection-point displacement in the midpoint direction. In other words, it provides for time-migration velocity analysis from prestack data. We have tested the feasibility of the method on synthetic data from four simple models and the Sigsbee2B data. Our tests determined that the proposed tool increases the velocity-model resolution and provides a plausible time-migrated image. The quality of the initial model is not critical. The procedure is quite efficient. Significant effort was spent on manual event picking.
We have developed a prestack time-migration tool for local improvement of the seismic migration-velocity model. The method is based on remigration trajectories that describe the position of an image point in the image domain for different source-receiver offsets as a function of the migration velocity. It determines kinematic migration parameters using local-slope information of migrated seismic reflection events. These parameters, in turn, are used to locally correct the velocity model. The main advantage of this technique is that it allows us to carry out a moveout correction not just at a fixed point in a zero-offset (poststack) time-migrated gather, but varying through all offsets of a common-image gather, taking into account the reflection-point displacement in the midpoint direction. In other words, it provides for time-migration velocity analysis from prestack data. We have tested the feasibility of the method on synthetic data from four simple models and the Sigsbee2B data. Our tests determined that the proposed tool increases the velocity-model resolution and provides a plausible time-migrated image. The quality of the initial model is not critical. The procedure is quite efficient. Significant effort was spent on manual event picking.
Subject: Método sísmico de reflexão
Prospecção sísmica - Modelos matemáticos
Ondas sísmicas - Modelos matemáticos
Country: Estados Unidos
Editor: Society of Exploration Geophysicists
Citation: Prestack Time-migration Velocity Analysis Using Remigration Trajectories. Soc Exploration Geophysicists, v. 80, p. S151-S163 JUL-AUG-2015.
Rights: fechado
Identifier DOI: 10.1190/GEO2014-0205.1
Address: https://library.seg.org/doi/10.1190/geo2014-0205.1
Date Issue: 2015
Appears in Collections:IMECC - Artigos e Outros Documentos

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