VSP reverse time migration and its data storage strategy
Wang Weihong1, Guo Xuebao1, Shi Ying1,2, Liu Shizhu1
1. School of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China;
2. "Fault Deformation, Sealing and Fluid Migration" Team, Science and Technology Innovation Group in Heilongjiang, Daqing, Heilongjiang 163318, China
Abstract：Although conventional random boundary methods can save storage space in reverse time migration algorithm, random noise often exists at shallow layers. PML boundary method can improve the situation, but suffer from seismic wave field storage problem. Here we adopt the high order optimization coefficient finite difference method to realize reverse-time depth migration of VSP data, and use Laplace denoising method to suppress low frequency noise. Considering both precision and storage, we store a part of source wave field forward modeling with PML boundary method, which is used in source wave field reverse extrapolation with receiver wave field. This approach can not only save storage space, but also ensure the reliability of the alternative wave field information. Fault model tests indicate that the proposed approach can be implemented with a low storage and high precision of VSP reverse time migration. Fault imaging is more clear and accurate than that of surface seismic migration.
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