Prestack reverse time migration on GPU/CPU co-parallel computation
Liu Wen-qing, Wang Yu-chao, Yong Xue-shan, Wang Xiao, Shao Xi-chun, Gao Hou-qiang, Liu Qiu-liang
1.Chengdu University of Technology,Chengdu, Sichuan 610059, China;
2.Research Institute of Petroleum Exploration & Development Branch Northwest,PetroChina, Lanzhou, Gansu 730020, China
Abstract:Based on the GPU/CPU co-parallel system,we achieve reverse-time extrapolation of the wavefield for the largest amount of computation through the GPU,improve wavefield extrapolation method parallelism using the idea of random velocity boundary,and solve the I/O problems of large-scale storage.Through optimizing the Laplace operator,the low-frequency noise from cross-correlation imaging condition is removed.Numerical experiments show that GPU/CPU co-parallel system has very high computational efficiency.In practical applications,we obtain not only high computational efficiency but also good imaging results.The theoretical model and real salt dome data processing resufts show the correctness of the algorithm.