Tian Kun1, Huang Jianping1, Li Zhenchun1, Cao Xiaoli1, Li Qingyang1, Lu Ping2
1. School of Geoscience, China University of Petroleum (East China), Qingdao, Shandong 266580, China;
2. Center of Engineering Supervision of Northwest Oil Field, Luntai, Xinjiang 841600, China
Abstract：The perfectly matched layer (PML) absorption boundary condition is widely used in numerical forward modeling of elastic wave equation since it has been proved to have a superior absorption performance than other absorption boundary condition method. But this PML absorption boundary condition also has some defects. For example, unsplit convolution perfectly matched layer (C-PML) absorption boundary is not stable in some media, and the split multi-axial perfectly matched layer (M-PML) absorption boundary is not efficient. Therefore we propose multi-axial convolution PML (MC-PML) based on the combination of C-PML and M-PML. The MC-PML can enhance the stability of C-PML as well as improve the absorption effect of M-PML. And the computational expense is lower because of the unsplit implementation method. Test results on a numerical forward modeling show that MC-PML obtains both higher stability and better absorption.
