3D Kirchhoff PSDM for large-scale seismic data and its parallel implementation strategy
Wang Huazhong1, Liu Shaoyong1, Kong Xiangning2, Cai Jiexiong1,2, Fang Wubao2
1. State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;
2. Sinopec Geophysical Research Institute(SGRI),Nanjing,Jiangsu 210014,China
Abstract：This paper presents an implementation strategy of Kirchhoff integral prestack depth migration(PSDM) for large-scale seismic data sets,which is based on the 3D traveltime calculation method for arbitrary velocity variations.The strategy includes several key points: ①Common-offset data sets are the input data of the Kirchhoff PSDM algorithm.②One depth layer of image volume are resided in the inner memory,which thickness is dependent on the physics memory of the computer.③The MPI plus OpenMp implementation strategy is proposed by taking consider of share memory and decreasing input and output(I/O) amount.And,the self-adaptive migration aperture can be chosen because the current layer travel-times of all shots are inputted into the inner memory.The frequency-selective operator across aperture also guarantees the imaging accurate.The scheme can output the common image point gathers(CIGs) in a convenient way.All these points guarantee the balance of I/Oand computation and make our Kirchhoff PSDM to be high efficient and accurate.The imaging results of the synthetic and real data demonstrate that the presented methods are correct and effective.
王华忠, 刘少勇, 孔祥宁, 蔡杰雄, 方伍宝. 大规模三维地震数据Kirchhoff叠前深度偏移及其并行实现[J]. 石油地球物理勘探, 2012, 47(3): 404-410.
Wang Huazhong, Liu Shaoyong, Kong Xiangning, Cai Jiexiong, Fang Wubao. 3D Kirchhoff PSDM for large-scale seismic data and its parallel implementation strategy. OGP, 2012, 47(3): 404-410.
