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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Solid Earth Geophysics
Volume 12 - 2024 | doi: 10.3389/feart.2024.1415181
This article is part of the Research Topic Advances of New Technologies in Seismic Exploration View all 20 articles

Reverse time migration based on body-fitted grid in pseudo-acoustic VTI media with surface topography

Provisionally accepted
Erxiang Wei Erxiang Wei 1,2*Jianping Huang Jianping Huang 1,2Zhenchun Li Zhenchun Li 1,2Xinru Mu Xinru Mu 3Qingyang Li Qingyang Li 4
  • 1 State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, China
  • 2 College of Earth Science and technology, China University of Petroleum (East China), Qingdao, China
  • 3 King Abdullah University of Science and Technology, Jeddah, Saudi Arabia
  • 4 Institute of Geophysical Exploration, Sinopec Zhongyuan Oilfield Company, Puyang, China

The final, formatted version of the article will be published soon.

    Conventional reverse time migration (RTM) may not produce high-quality images in the areas with surface topography and anisotropy. Because the complex surfaces have great impact on seismic wave simulation, resulting in strong scattering waves, and without considering the anisotropic effects, isotropic acoustic (ISO) RTM produces incorrect travel times during source and receiver wavefield extrapolation. To overcome these problems, we develop a topographic pseudo-acoustic VTI RTM algorithm based on body-fitted grid. In this method, we first derive anisotropic pseudo-acoustic wave equations in curvilinear coordinate system. Then Lebedev grid finite-difference scheme is used to update these equations to simulate wavefields. Finally, we use the sourcenormalized cross-correlation imaging condition to realize RTM. Numerical tests are performed to evaluate the feasibility and applicability of the proposed method in the pseudo-acoustic VTI media with complex topographic surface. The imaging results show that the proposed method can correct the effect of surface topography and anisotropy on seismic wave propagation and improve migration imaging precision.

    Keywords: Reverse time migration, Body-fitted grid, VTI media, Surface topography, Lebedev grid, Coordinates transformation

    Received: 10 Apr 2024; Accepted: 26 Jul 2024.

    Copyright: © 2024 Wei, Huang, Li, Mu and Li. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Erxiang Wei, State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.