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《Chinese Journal of Geophysics》 2003-02
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METHOD OF CREATING SHORT OPERATOR OF WAVEFIELD EXTRAPOLATING

LI BING LIU HONG LI YOUMING Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China  
In explicit depth extrapolation method of frequency-space fields, wavefield depth extrapolation is completed with convolution of short explicit difference operators and the wavefield. Based on the study of the method of creating short explicit difference operators, a method for creating short explicit operators is presented, which is based on discrete smooth interpolation with control of phase-shift operator. In the wavefield-spread area, we uses the phase-shift operator as constraint in frequency-wavenumber field, while beyond the wavefield-spread data, we uses zero point at the ends of phase-shift operator as constraint to take discrete smooth interpolation so that the resulted operator satisfies two-order smooth and the length of this operator can be selected shorter in frequency-space field. This method has simple creating process and high precision, and can be used in wavefields depth extrapolation.
【Fund】: 中国科学院知识创新工程重大项目资助课题 (KZCXL -Y - 0 1 );; 国家自然科学基金和大庆石油管理局联合资助项目 (498941 90 ) .
【CateGory Index】: P631
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