Petroleum Science >2023, Issue2: - DOI: https://doi.org/10.1016/j.petsci.2022.12.016
Target-oriented Q-compensated reverse-time migration by using optimized pure-mode wave equation in anisotropic media Open Access
文章信息
作者:Shi-Gang Xu, Qian-Zong Bao, Zhi-Ming Ren
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投稿时间:
引用方式:Shi-Gang Xu, Qian-Zong Bao, Zhi-Ming Ren, Target-oriented Q-compensated reverse-time migration by using optimized pure-mode wave equation in anisotropic media, Petroleum Science, Volume 20, Issue 2, 2023, Pages 866-878, https://doi.org/10.1016/j.petsci.2022.12.016.
文章摘要
Abstract: Research on seismic anisotropy and attenuation plays a significant role in exploration geophysics. To enhance the imaging quality for complicated structures, we develop several effective improvements for anisotropic attenuation effects in reverse-time migration (Q-RTM) on surface and vertical seismic profiling (VSP) acquisition geometries. First, to suppress pseudo-shear wave artifact and numerical instability of the commonly used anisotropic pseudo-acoustic wave equations, an optimized pure P-wave dispersion relation is derived and the corresponding pure-mode wave equation is solved by combining the finite-difference and Possion methods. Second, a simplified anisotropic pure-mode visco-acoustic wave equation (PVAWE) based on standard linear solid model is established. Third, a time-dispersion correlation strategy is applied to improve the modeling accuracy. Fourth, we extend a target-oriented scheme to anisotropic attenuated modeling and imaging. Instead of the conventional wavefield modeling and RTM, the proposed approach can extract available wavefield information near the target regions and produce high imaging resolution for target structures. Last, both anisotropic surface and VSP Q-RTMs are executed by combining optimized PVAWE, time-dispersion correlation and target-oriented algorithm. Modeling examples demonstrate the advantages of our schemes. Moreover, our modified Q-compensated imaging workflow can be regarded as a supplement to the classical anisotropic RTM.
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Keywords: Anisotropy; Attenuation; Reverse-time migration; Wave equation; Optimized algorithm; Target-oriented