Parallel large-scale variable grid 3D seismic wave modeling
Cai Zhicheng1,2, Gu Hanming1,2, Cheng Jingwang3, Liu Chuncheng4, Liu Zhibin4, Liu Shaoyong1,2
1. Institute of Geophysics and Geomatics, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China;
2. Hubei Key Laboratory of Subsurface Multi-scale Imaging, Wuhan, Hubei 430074, China;
3. College of Geophysics and Oil Resource, Yangzte University, Wuhan, Hubei 430100, China;
4. CNOOC Research Institute, Beijing 100027, China
Abstract：3D wave equation numerical modeling is one of the key approaches in the analysis of complex reservoir wavefield characteristics and seismic response recognition model building. This numerical modeling however,needs huge consuming time and large memory. We use MPI parallel to deal with the problems. First the whole calculation task is divided into a few parts and distributed to a number of CPUs to accomplish the modeling. Then the variable grid algorithm is applied in wave equation,and smaller grids are used in geologically complex regions in order to effectively and accurately simulate wave propagation. Therefore,our special MPI parallel strategy is developed,and it is more appropriate to the large scale variable grid 3D seismic modeling algorithm. The new strategy reduces computation consuming time and memory size,and further improves the efficiency of the normal large MPI seismic wave modeling algorithm. Model tests prove that the proposed strategy of parallel large-scale variable grid 3D seismic wave modeling algorithm is more efficient and accurate.
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