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Type: Artigo de periódico
Title: Coherence measures in automatic time-migration velocity analysis
Author: Maciel, JS
Costa, JC
Schleicher, J
Abstract: Time-migration velocity analysis can be carried out automatically by evaluating the coherence of migrated seismic events in common-image gathers (CIGs). The performance of gradient methods for automatic time-migration velocity analysis depends on the coherence measures used as the objective function. We compare the results of four different coherence measures, being conventional semblance, differential semblance, an extended differential semblance using differences of more distant image traces and the product of the latter with conventional semblance. In our numerical experiments, the objective functions based on conventional semblance and on the product of conventional semblance with extended differential semblance provided the best velocity models, as evaluated by the flatness of the resulting CIGs. The method can be easily extended to anisotropic media.
Subject: migration velocity analysis
time migration
coherence optimization
Country: Inglaterra
Editor: Iop Publishing Ltd
Citation: Journal Of Geophysics And Engineering. Iop Publishing Ltd, v. 9, n. 5, n. 569, n. 584, 2012.
Rights: fechado
Identifier DOI: 10.1088/1742-2132/9/5/569
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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