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Prestack migration based on asymmetric wave-equation extrapolation

CHIYUAN REN1 ,  XIN TIAN2
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1 College of Science, Southwest Petroleum University, Chengdu 610500, P.R. China.,
2 Applied Technology College, Southwest Petroleum University, Chengdu 610500, P.R. China.,
JSE 2016, 25(4), 375–397;
Submitted: 25 May 2015 | Accepted: 7 April 2016 | Published: 1 August 2016
© 2016 by the Authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution -Noncommercial 4.0 International License (CC-by the license) ( https://creativecommons.org/licenses/by-nc/4.0/ )
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Abstract

Ren, C. and Tian, X., 2016. Prestack migration based on asymmetric wave-equation extrapolation. Journal of Seismic Exploration, 25: 375-397. Prestack wave-equation migration has been popular in recent years. One-way wave equation migration and two-way wave-equation migration are the two choices for applying the wave-equation migration. They have different advantages and disadvantages. In this investigation, a combined version of these methods is developed, called asymmetric wave-equation migration. In this migration scheme, the source wave-field is extrapolated using the one-way wave-equation or two-way wave-equation, but the receiver wave-field is extrapolated based on the wave-equation being different from the former. By analyzing theoretically, the asymmetric wave-equation migration scheme can greatly reduce computation time compared with two-way wave-equation migration. Meanwhile, detailed comparisons between different migration schemes have been performed. The results show that the proposed migration scheme can work better than the two-way wave-equation migration, with less computation time and noise; thus, it is a new choice when we select migration schemes.

Keywords
wave-equation migration
one-way wave-equation
two-way wave-equation
computation complexity
image quality
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Journal of Seismic Exploration, Print ISSN: 0963-0651, Published by AccScience Publishing
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