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《中国科学:地球科学(英文版)》 2012-12
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Applying accurate gradients of seismic wave reflection coefficients (SWRC) to the inversion of seismic wave velocities

LIU FuPing 1, MENG XianJun 2 , XIAO JiaQi 3 , WANG YuMei 2 & SHEN GuoQiang 2 1 Beijing Institute of Graphic Communication, Beijing 102600, China; 2 Shengli Geophysical Research Institute of SINOPEC, Dongying 257022, China; 3 Greatwall Drilling Company of CNPC, Beijing 100101, China  
Through solving the Zoeppritz’s partial derivative equations, we have obtained accurate partial derivatives of reflected coefficients of seismic wave with respect to Pand S-wave velocities.With those partial derivatives, a multi-angle inversion is developed for seismic wave velocities.Numerical examples of different formation models show that if the number of iterations goes over 10, the relative error of inversion results is less than 1%, whether or not there is interference among the reflection waves.When we only have the reflected seismograms of P-wave, and only invert for velocities of P-wave, the multi-angle inversion is able to obtain a high computation precision.When we have the reflected seismograms of both P-wave and VS-wave, and simultaneously invert for the velocities of P-wave and VS-wave, the computation precisions of VS-wave velocities improves gradually with the increase of the number of angles, but the computation precision of P-wave velocities becomes worse.No matter whether the reflected seismic waves from the different reflection interface are coherent or non-coherent, this method is able to achieve a higher computation precision.Because it is based on the accurate solution of the gradient of SWRCs without any additional restriction, the multi-angle inversion method can be applied to seismic inversion of total angles.By removing the difficulties caused by simplified Zoeppritz formulas that the conventional AVO technology struggles with, the multiangle inversion method extended the application range of AVO technology and improved the computation precision and speed of inversion of seismic wave velocities.
【Fund】: supported by Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality(PHR(IHLB))(Grant No.PHR201107145)
【CateGory Index】: P631.4
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