中文摘要：

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．

英文摘要：

Deviations of any pure mode （non-converted） wave reflection traveltimes 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.