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Type: Artigo
Title: Time-to-depth conversion and velocity estimation by image-wavefront propagation
Author: Valente, Leandro da S. Salada
Santos, Henrique B.
Costa, Jessé C.
Schleicher, Jörg
Abstract: A new strategy for time-to-depth conversion and intervalvelocity estimation is based entirely on image-wavefront propagation without the need to follow individual image rays. The procedure has three main features: (1) It computes the velocity field and the traveltime directly, allowing us to dispense with dynamic ray tracing; (2) it requires only the knowledge of the image wavefront at the previous time step; and (3) it inherently smooths the image wavefront, inhibiting the formation of caustics. As a consequence, the method tends to be faster than the usual techniques and does not carry the constraints and limitations inherent to common ray-tracing strategies. Synthetic tests using a Gaussian velocity anomaly as well as the Marmousi velocity model, and two smoothed versions of it show the feasibility of the method. A field-data example demonstrates the use of different numerical procedures. Our results indicate that the present strategy can be used to construct reasonable depth-velocity models that can be used as reliable starting models for velocity-model building in depth migration or for tomographic methods.
Subject: Geofísica
Método sísmico de reflexão
Propagação de ondas
Seismic reflection method
Wave propagation
Country: Estados Unidos
Editor: Society of Exploration Geophysicists
Rights: fechado
Identifier DOI: 10.1190/GEO2016-0570.1
Date Issue: 2017
Appears in Collections:IMECC - Artigos e Outros Documentos

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