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A pre-stack depth diffraction imaging workflow based on angle gathers

JIANGJIE ZHANG
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Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, P.R. China.,
JSE 2013, 22(2), 129–145;
Submitted: 26 April 2012 | Accepted: 15 February 2013 | Published: 1 May 2013
© 2013 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

Zhang, J., 2013. A pre-stack depth diffraction imaging workflow based on angle gathers. Journal of Seismic Exploration, 22: 129-145. A new workflow is presented that can image diffracted waves for pre-stack seismic data based on angle gathers. This workflow combines the advantages of pre-stack time migration and pre-stack depth migration. For simplicity in calculations and parameter estimations, we mute the Fresnel zones related to reflections to enhance diffractions in the common angle gathers by shot-domain pre-stack time migration. A structural dip estimation scheme is provided to obtain the best Fresnel zones for accurate attenuation of reflections. Then, the demigration processing is used to remove the effect of previous pre-stack time migration on the imaged diffracted events to obtain diffracted wavefield. At last, the diffracted wavefield is imaged again by pre-stack depth migration, which adapt to imaging for complex structure. The result of my method is an effective complement to conventional interpretation workflow in detecting of small-scale geological discontinuities. Synthetic example and field data example demonstrate that my method is accurate, robust and easy to implement.

Keywords
diffraction imaging
Fresnel zone
angle gather
structural dip
demigration
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Journal of Seismic Exploration, Electronic ISSN: 0963-0651 Print ISSN: 0963-0651, Published by AccScience Publishing
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