石油物探2024，Vol.63Issue(4)：766-777,12.DOI:10.12431/issn.1000-1441.2024.63.04.006
基于有限差分-低秩分解策略的黏声各向异性纯qP波正演模拟方法
Pure qP-wave forward modelling for viscoacoustic anisotropic media based on finite-difference low-rank decomposition strategy
摘要
Abstract
Viscoelastic and anisotropic characteristics of subsurface media cause phase dispersion and amplitude dissipation of seis-mic waves.If these undesired effects are ignored during seismic processing,distorted events and migration artifacts may appear in imaging results.The traditional pseudo-acoustic qP-wave equation for viscoacoustic TTI media can be used to simulate seismic-wave propagation in viscoacoustic anisotropic media.However,this equation produces shear wave artifacts,and its application is limited by model parameters(ε＞δ).To address this issue,a pure qP-wave equation for viscoacoustic TTI media is derived by com-bining the pure qP-wave dispersion relation based on acoustic approximation with the constant-Q attenuation model.The newly de-rived wave equation contains decoupled phase dispersion and amplitude loss terms,and it is conducive to the implementation of at-tenuation-compensated reverse time migration.Based on the newly derived wave equation,the finite-difference low-rank decomposi-tion strategy is proposed to realize pure qP-wave forward modeling for viscoacoustic TTI media.The numerical simulation results show that the newly derived wave equation overcomes the limitation of pseudo-acoustic qP-wave equation for viscoacoustic TTI media and can simulate seismic-wave propagation in viscoacoustic anisotropic media accurately and stably.In addition,the finite-difference low-rank decomposition strategy developed in this paper inherits the high efficiency of finite-difference solutions and has higher computational efficiency than traditional low-rank decomposition methods.关键词
黏声各向异性/纯qP波方程/正演模拟/有限差分-低秩分解法Key words
viscoacoustic anisotropy/pure qP-wave equation/forward modelling/finite difference-low rank decomposition method分类
地质学引用本文复制引用
李书瑜,梁兵,郭廷超,潘成磊,许冲..基于有限差分-低秩分解策略的黏声各向异性纯qP波正演模拟方法[J].石油物探,2024,63(4):766-777,12.基金项目
中国石化科技部项目(P21108)资助.This research is financially supported by the Research and Development Project of SINOPEC(Grant No.P21108). （P21108）
