XU Wen-Cai,
YANG Guo-Quan,
LI Zhen-Chun et al
.2016.Pseudo acoustic equation for TI medium attenuation based on the GSLS model.Chinese Journal Of Geophysics,59(6): 2232-2244,doi: 10.6038/cjg20160626
基于GSLS模型TI介质衰减拟声波方程
徐文才, 杨国权, 李振春, 孙小东, 王姣
中国石油大学(华东)地球科学与技术学院, 山东青岛 266580
Pseudo acoustic equation for TI medium attenuation based on the GSLS model
XU Wen-Cai, YANG Guo-Quan, LI Zhen-Chun, SUN Xiao-Dong, WANG Jiao
School of Geosciences, China University of Petroleum (East China), Shandong Qingdao, 266580, China
Abstract：It is well known that the underground medium is far from being an acoustic material. Neglecting anisotropy and attenuation in seismic wave propagation can result in inaccuracy imagery, such as problems of diffracted wave convergence and seismic wave attenuation. So it is urgent to take anisotropy and viscosity into account, and necessary to consider both of the characteristics in practical production. In this paper, starting from the basic theory of elastic waves in TI media, and introducing the GSLS theory of isotropic medium into anisotropic material, we derive a pseudo acoustic equation for anisotropic attenuation based on the GSLS model by the acoustic approximation method. The numerical results show that the VTI viscoacoustic wave equation can not only describe the propagation of wave in anisotropic media accurately, but also reflect the effects of absorption and attenuation. Reverse time migration of the HESS model on the VTI medium shows that the attenuation pseudo acoustic equations can image more clearly, such as the complex structure with high steep dip angles, make deep amplitude distribution more balanced, and obtain more accurate and reliable amplitude imaging profiles.
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