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Pure q P-wave least-squares reverse time migration invertically transverse isotropic media and its application to field data
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作者 Huang Jian-Ping Mu Xin-Ru +3 位作者 Li Zhen-Chun Li Qing-Yang Yuan Shuang-Qi Guo Yun-Dong 《Applied Geophysics》 SCIE CSCD 2020年第2期208-220,315,共14页
The anisotropic properties of subsurface media cause waveform distortions in seismic wave propagation,resulting in a negative infl uence on seismic imaging.In addition,wavefields simulated by the conventional coupled ... The anisotropic properties of subsurface media cause waveform distortions in seismic wave propagation,resulting in a negative infl uence on seismic imaging.In addition,wavefields simulated by the conventional coupled pseudo-acoustic equation are not only aff ected by SV-wave artifacts but are also limited by anisotropic parameters.We propose a least-squares reverse time migration(LSRTM)method based on the pure q P-wave equation in vertically transverse isotropic media.A fi nite diff erence and fast Fourier transform method,which can improve the effi ciency of the numerical simulation compared to a pseudo-spectral method,is used to solve the pure q P-wave equation.We derive the corresponding demigration operator,migration operator,and gradient updating formula to implement the LSRTM.Numerical tests on the Hess model and field data confirm that the proposed method has a good correction eff ect for the travel time deviation caused by underground anisotropic media.Further,it signifi cantly suppresses the migration noise,balances the imaging amplitude,and improves the imaging resolution. 展开更多
关键词 Pure qP-wave equation vertically transverse isotropic media LSRTM finite difference and fast fourier transform field data
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