Reverse time migration in viscoacoustic TTI media based on pure qP wave equation

被引：2

作者：

Mu X. ^{[1
,2
]}

Huang J. ^{[1
,2
]}

Li G. ^{[1
,2
]}

Mao Q. ^{[1
,2
]}

机构：

[1] School of Geosciences in China University of Petroleum (East China), Qingdao

[2] Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao

来源：

Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2023年 / 47卷 / 02期

关键词：

finite difference and pseudo spectral method; regularization operator; reverse time migration; viscoacoustic TTI media;

D O I：

10.3969/j.issn.1673-5005.2023.02.005

中图分类号：

学科分类号：

摘要：

During seismic wave propagation, phase distortion and amplitude attenuation occur due to the anisotropy and viscosity of the underground media. Failure to correct for these effects during migration imaging can lead to reduced imaging resolution and the introduction of imaging noise. To address this, we introduce viscosity into the anisotropic wave equation and obtain a pure qP wave equation in viscoacoustic TTI media. We then develop a reverse time migration imaging method based on the wave equation of viscoacoustic TTI media. The exponential increase of high-frequency noise in the wave field during viscosity compensation can cause wave propagation instability. To mitigate this issue, we introduce a stable regularization operator into the energy compensation process to suppress the high-frequency noise. Numerical tests show that the new wave equation accurately simulates wave propagation characteristics in viscous and anisotropic media. In addition, the proposed reverse time migration imaging algorithm for viscoacoustic TTI media corrects travel time error and phase distortion, compensates for energy attenuation, and achieves high-precision imaging of underground complex media with anisotropy and viscosity. © 2023 University of Petroleum, China. All rights reserved.

引用

页码：44 / 52

页数：8

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