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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。
In multi-component seismic exploration data, both P and SV waves are recorded in both horizontal and vertical components. In this paper, we study the method of wavefield decomposition of P-wave and SV-wave. When the up-going P-wave and the S-wave are incident respectively, the horizontal and vertical displacements caused by them are studied and the horizontal and vertical components of the seismic record are decomposed to obtain the longitudinal and converted wave. In the known submarine medium, the P-wave velocity and medium density , The wavefield decomposition can be realized in the τ-P domain and then transformed into the time domain to obtain the longitudinal and converted-wave profiles in the time domain. The wavefield decomposition method applied in this paper is applied to synthetic data and can effectively decompose the longitudinal wavefield and the converted wavefield. Finally, the practical application of multi-component data at sea shows that the wavefield decomposition method proposed in this paper is feasible and effective. This method is also applicable to free surface data.