【摘要】 纵、横波的分离是多波多分量地震资料处理中很重要的一步,其分离结果直接影响到后续数据处理的质量.各向同性介质中纵波为无旋场,横波为无散场,因此可以在频率-波数域利用散度和旋度算子对地震记录进行纵、横波分离,但是此处理过程必须知道地表处的纵、横波速度.本文给出了一种估算地表纵、横波速度的方法,可以在纵、横波速度值未知的情况下,将其估算出来.针对弹性波场进行散度和旋度运算时,纵、横波的相位和振幅比发生改变的问题,本文给出了相位和纵、横波振幅比的校正方法.更多还原

【Abstract】 The separation of P- and S-wavefields from multi-component seismic data is very important, which has a direct impact on the follow-up data processing. In isotropic media, P-wavefield is curl-free and S-wavefield is divergence-free, so the P- and S-wavefields can be separated by taking the divergence and curl in frequency-wavenumber domain. However, only when the surface P velocity and S velocity are known, the P- and S-waves will be separated. In the paper, a method of estimating surface P velocity and S velocity is developed, which can obtain the surface velocities, even if they are unknown. A method for correcting phase and amplitude ratio of P-wave and S-wave is also presented, which solves the problem that the phase and amplitude ratios of P-wave and S-wave are changed after taking the divergence and curl.更多还原