The stability problem of reverse time migration for viscoacoustic VTI media  

黏声VTI介质逆时偏移成像稳定性研究（英文）

作　　者：Sun Xiao-Dong Ge Zhong-Hui Li Zhen-Chun Hong Ying 孙小东;葛中慧;李振春;洪瑛(中国石油大学(华东),青岛266580;海洋国家实验室海洋矿产资源评价与探测技术功能实验室,青岛266071)

机构地区：[1]China University of Petroleum （East China）, Qingdao 266580, China [2]Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China

出　　处：《Applied Geophysics》2016年第4期608-613,736,737,共8页应用地球物理（英文版）

基　　金：Research is sponsored by the National Natural Science Fund(No.41274117);the National Natural Science Fund(No.41574098);Sinopec Geophysical Key Laboratory Open Fund(No.wtyjy-wx2016-04-2)

摘　　要：In real strata anisotropy and viscosity extensively exists. They degraded waveforms in amplitude, resulting in which reducing of image resolution. To obtain high-precision imaging of deep reservoirs, we extended the separated viscous and anisotropic reverse time migration （RTM） to a stable viscoacoustic anisotropic RTM for vertical transverse isotropic （VTI） media, based on single generalized standard and linear solid （GSLS） media theory.. We used a pseudo-spectral method to develop the numerical simulation. By introducing a regularization operator to eliminate the high-frequency instability problem, we built a stable inverse propagator and achieved viscoacoustic VTI media RTM. High-resolution imaging results were obtained after correcting for the effects of anisotropy and viscosity. Synthetic tests verify the validity and accuracy of algorithm.实际地层广泛存在各向异性和黏滞性,使得地震波波形发生改变,振幅能量降低,降低了成像的分辨率。为了进行深部储层高精度成像,本文基于GSLS模型黏声各向同性介质理论,将其扩展到各向异性介质中,给出了黏声垂直横向各向同性(VTI)介质声波拟微分方程组,采用伪谱法进行数值模拟。引入规则化算子消除高频不稳定问题,构建稳定的逆时传播算子,实现黏声VTI介质逆时偏移。该方法在成像过程中,考虑了各向异性和黏滞性的影响,具有更高的分辨率和振幅保真度,模型试算验证了方法的正确性。

关 键 词：Viscoacoustic vertical transverse isotropic VTI medium Pseudo-differential equations Reverse-time propagator Reverse-time migration 

分 类 号：P631.4[天文地球—地质矿产勘探]