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Space-time-domain Gaussian beam migration in VTI media based on the upward ray tracing and its application in land field data

DONGLIN ZHANG1,2 ,  JIANPING HUANG1,2 ,  JIDONG YANG1,2 ,  BIN ZHOU3 ,  JIANFENG ZHANG3 ,  QINGYANG LI4
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1 School of Geosciences, China University of Petroleum (East China), Qingdao 266580, P.R. China.,
2 Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, P.R. China.,
3 Geophysical China Oilfield Services Limited, Tianjing 300459, P.R. China.,
4 Geophysical Exploration Research Institute of Zhongyuan Oilfield Company, Puyang, 457001, P.R. China.,
JSE 2022, 31(6), 545–562;
Submitted: 22 March 2022 | Accepted: 10 September 2022 | Published: 1 December 2022
© 2022 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, D.L., Huang, J.P., Yang, J.D., Zhou, B., Zhang, J.F. and Li, Q.Y., 2022. Space-time-domain Gaussian beam migration in VTI media based on the upward ray tracing and its application in land field data. Journal of Seismic Exploration, 31: 545-562. Gaussian beam migration (GBM) method is an efficient and adaptable imaging tool, but the traditional GBM method may produce some false imaging in some layers due to the inaccurate ray tracing in the construction of reverse wavefields. Firstly, the reverse wavefields are constructed by using the upward ray tracing strategy. Then, we derive the space-time-domain GBM formula in acoustic medium based on the cross-correlation imaging condition. Finally, taking in account the anisotropic characteristics, we use the anisotropic ray tracing theory to implement a space-time-domain GBM approach in VTI media. After testing for the anisotropic graben and diffractor models as well as a land field data, compared with the imaging results in space-time-domain isotropic GBM, we get the following conclusions: 1) The diffraction energy of the graben model is more convergent in the low layers; 2) Our method can clearly image the diffracting points of the diffractor model; 3) For the field data, the image resolution is obviously improved, the fault planes are clearer, and the image amplitude in the left part of the anticline is more balanced.

Keywords
Gaussian beam migration
upward ray tracing
space-time-domain
VTI
anisotropic
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Journal of Seismic Exploration, Electronic ISSN: 0963-0651 Print ISSN: 0963-0651, Published by AccScience Publishing
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