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《Chinese Journal of Geophysics》 2010-09
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The problems of denoise and storage in seismic reverse time migration

LIU Hong-Wei~(1,2),LIU Hong~1,ZOU Zhen~(1,2),CUI Yong-Fu~3 1 Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China 2 Graduate University,the Chinese Academy of Sciences,Beijing 100049,China 3 Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China  
Pre-stack reverse time migration (RTM) is a very useful tool for seismic imaging, however, it has some problems such as highly intensive computation cost, imaging noise, and massy memory demand, which the researchers in the field have been striving to solve.The problem of intensive computation cost could be solved by GPU/CPU collaborative computing and has been discussed in the last paper and the other two problems will be emphasized in this paper. At the beginning, we analyze the generation principle of imaging noise and propose that the phase and frequency spectra of seismic data should be modified before migration and a Laplacian filter could be used to remove the low wave-number noise efficiently.Aiming at the problem of massy memory demand, we adopt the random boundary condition which reduces the memory demand but sacrifice the computation cost.The implementation could be performed on GPU and the communication between CPU and GPU could be saved which could reduce the computation cost in another way.The tests on synthetic data examples illustrate that the difference between the migration result from the method of random boundary condition and that from the traditional method of saving the footprint of the wave field could be overlooked.
【Fund】: 国家科技重大专项(2008ZX05008-006-003);; 国家重大科研装备研制项目(ZDYZ2008-2-A08)联合资助
【CateGory Index】: P631.4
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