对多分量地震资料P-和SV-波场分解

摘要

In multi-component seismic exploration, the horizontal and vertical components both contain P- and SV-waves. The P- and SV-wavefields in a seismic record can be separated by their horizontal and vertical displacements when upgoing P- and SV-waves arrive at the sea floor. If the sea floor P wave velocity, S wave velocity, and density are known, the separation can be achieved in theτ-p domain. The separated wavefields are then transformed to the time domain. A method of separating P- and SV-wavefields is presented in this paper and used to effectively separate P- and SV-wavefields in synthetic and real data. The application to real data shows that this method is feasible and effective. It also can be used for free surface data.%在多分量地震勘探资料中,水平和垂直分量都记录有P波和SV波.本文研究了P波和SV波波场分解的方法.当上行P波和S波分别入射时,通过研究它们引起的水平和垂直位移,把地震记录的水平和垂直分量进行分解,得到纵波和转换波;在已知海底介质中纵横波速度和介质密度的情况下,可以在τ-p域内实现波场分解,然后变换到时间域,得到时间域内的纵波和转换波剖面.把本文研究的波场分解方法应用于合成资料,能够有效地分解得到纵波波场和转换波波场.最后,海上多分量实际资料的实例应用表明,本文研究的波场分解方法是可行有效的.本方法也适用于自由表面的资料.