【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（A₄）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A₄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A₄变化特征,而且TI对称轴的方位决定了A₄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.更多还原

【Abstract】 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（A₄）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 A₄ with the CMP survey line azimuth variation. The modeling results show that the characteristic of the A₄ 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 A₄ 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 A₄ with the survey line variation.Our numerical results will benefit the explanation of the anisotropic seismic data and the parameters inversion.更多还原