Seismic forward modeling in fluid-solid media based on equivalent staggered grid scheme
Wu Jianlu1,2, Wu Guochen1,2, Wang Wei3, He Jing3
1. China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China; 3. Bohai Petroleum Research Institute, Tianjin Branch, CNOOC, Tianjin 300459, China
Abstract：In order to improve the stability and accuracy of seismic simulation for fluid-solid coupling media, the effect of density variation is taken into account based on the equivalent staggered grid.For fluid-solid coupling interface, the first-order stress-velocity equations are selected, in which the fluid domain is represented by second-order pressure equations and solid domain is computed by second-order displacement equations, and the method for coupling the fluid and solid domain by interface is carefully illustrated.The method can save the memory of the modeling parameters and reduce the operation time of seismic modeling.Comparing with the results in fine size model condition, the accuracy of the proposed method is verified.Then the approach is applied on complex Marmousi 2 model.The results show that the proposed method is very stable and precise, in which the accuracy is proved to be the same compared with the results of standard staggered grid method.
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