任意空间取向TI介质中P波四次时差系数特征
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摘要
同类反射波(非转换波)走时偏离双曲,称为非双曲或四次时差,在长排列各向异性地震资料处理中需要校正.本文基于我们导出的水平界面任意空间取向TI(ATI)介质中同类反射波四次时差系数(A_4)的精确解析解,数值计算研究P波四次时差系数特征.正演结果表明,ATI条件下A_4系数随CMP测线方位变化的特征不仅与TI介质的各向异性参数有关,而且与TI对称轴的空间取向密切相关;TI介质的各向异性参数和TI对称轴的倾角决定了A_4变化特征,而且TI对称轴的方位决定了A_4随测线方位变化的对称性.此研究结果将对各向异性解释及参数反演有参考意义.
Deviations of any pure mode(non-converted)wave reflection travehimes from a hyperbola,called the nonhyperbolic or quartic moveout,need to be handled properly while processing long-spread anisotropic seismic data.Based on our exact analytic expression for the quartic moveout coefficient(A_4)of pure mode(non-converted)wave reflection for a horizontal interface in the TI media with an arbitrary spatial orientation of symmetry axis(ATI),we numerically study the characteristic of the P-wave A_4 with the CMP survey line azimuth variation. The modeling results show that the characteristic of the A_4 is not only relative to the anisotropy parameters of the TI,but also to the spatial orientation of the TI.The variation characteristic of the A_4 is determined by the anisotropy parameters and tilt angle of the TI symmetric-axis,and the azimuth of the TI symmetric-axis results in the azimuth symmetry of the A_4 with the survey line variation.Our numerical results will benefit the explanation of the anisotropic seismic data and the parameters inversion.
引文
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