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《Chinese Journal of Geophysics》 2008-01
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Frequency-dependent varying-step depth extrapolation scheme for wave equation based migration

ZHANG Jian-Feng, LU Bao-Kun, LIU Li-NongInstitute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China  
We propose a frequency-dependent varying-step depth extrapolation scheme and a table-driven, one-point wavefield interpolation technique for the wave equation based migration methods. The former reduces the computational cost of wavefield depth extrapolation, and the latter reconstructs the extrapolated wavefield with an equal,desired vertical step with high computational efficiency. The proposed varying-step depth extrapolation plus one-point interpolation scheme results in 2/3 reduction in computational cost when compared to the conventional equal-step depth extrapolation of wavefield, but gives the almost same imaging. We present the scheme using the optimum split-step Fourier method on the 2-D Marmousi dataset and 3-D field dataset. The results demonstrate the high computational efficiency of the scheme in the absence of loss of accuracy. The proposed scheme can also be used by other wave equation based migration methods of the frequency domain.
【Fund】: 科技部863项目(2006AA09A102);; 中国科学院知识创新工程青年人才领域前沿项目;; 973项目(2005CB422104)资助
【CateGory Index】: P631.4
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