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《Progress in Geophysics》 2015-04
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Investigation on high-accuracy pre-stack reverse-time migration for VTI medium

FANG Xiu-zheng;SHI Ying;KE Xuan;GAO Xin-cheng;JING Hong-tao;Earth Science College of Northeast Petroleum University;Science and Technology Innovation Team on Fault Deformation,Sealing and Fluid Migration;State key laboratory of coastal and offshore engineering;Daqing oilfield Hailar exploration and development headquarters;  
Two-way wave equation pre-stack reverse-time migration is a kind of high-accuracy seismic imaging method which has no restrictions and is very suitable for complex structure imaging.The high-accuracy seismic wave forward modeling and reverse-time migration must consider the effect of anisotropy because of widely existing anisotropic media of the earth.This paper fully considers the problem of anisotropy and the problem of reverse time migration of large volume,large storage capacity,and studies an improved efficient PML boundary storage strategy of anisotropic VTI medium reverse time migration method based on GPU acceleration.Compared to the conventional method of reverse time migration,this method greatly reduces the storage while increases a small amount of calculation,the anisotropy reverse time migration can achieve high precision and high efficiency.On the basis of first-order quasi-P wave equation in transversely isotropic media with a vertical symmetry axis(VTI),deduce the reverse-time extrapolation of the staggered grid high-order finite-difference scheme of shot points and receive points.In order to solve the huge amount of calculation and storage problem of reverse-time migration,we provide an improved efficient PML absorbing boundary condition based on the GPU acceleration.Test on the Hess 2DVTI model proves that this method is good for a big model and it is a high-accuracy seismic imaging method.
【Fund】: 国家高技术研究发展计划(863)(2012AA061202);; 国家自然科学基金项目(41474118)联合资助
【CateGory Index】: P631.4
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