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《Chinese Journal of Geophysics》 2011-01
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Prestack time migration in anelastic media based on designing for short operator

LI Xue-Ying~1,L Xi-Bin~1,ZHANG Jian-Feng~2 1 College of Earth Sciences,Northeast Petroleum University,Daqing 163318,China 2 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China  
In order to raise the computational efficiency of frequency domain prestack time migration in anelastic media,the high-accuracy optimum short convolution operators in time domain are designed by weighted least squares method.Therefore a table-driven time domain prestack time migration scheme in anelastic media is presented.This scheme can transform large amount of multiplication operation frequency by frequency into less convolution operation in time domain and split calculation of travel time,amplitude and short convolution operator from the inverse Q compensation migration,which greatly improved the computational efficiency of timedomain pre-stack time migration in anelastic media.A stabilization controlling strategy is proposed to ensure the stability of arithmetic in compensation for absorption and dispersion. Numerical examples indicate that the short convolution operator has very high accuracy designed by weighted least squares method.The algorithm in time domain can achieve the same compensation result as in frequency domain while its computational cost is close to the conventional prestack time migration.
【Fund】: 国家自然科学基金重点项目(40930422);; 国家油气重大专项(2008ZX05023-005-010)联合资助
【CateGory Index】: P631.4
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