基于PCA的井间地震偏振分析方法及其应用

Cross-Well Seismic Polarization Analysis Method Based on PCA and Its Application

基于主成分分析(principal component analysis,PCA)方法构建理论模型进行三分量地震偏振分析试算,获得较准确的检波器的水平方位角和垂直倾角,然后对地震响应进行坐标旋转,从而校正检波器方向。将该方法应用于跨孔井间弹性波波速测试,对实测资料进行偏振分析可知,初至P波与初至S波分别在HP分量和R分量中得到加强,不仅有利于初至起跳的拾取,还可以获得较准确的波速资料,为岩土工程设计提供更精确的动力学参数。

Based on the principal component analysis(PCA),we construct a theoretical model for three-component seismic polarization analysis and obtain more accurate horizontal azimuth and vertical inclination of the geophone.And then the seismic response is rotated to correct the direction of the geophone.We apply this method to the elastic wave velocity test between cross-well,through the polarization analysis of the measured data,the first break of P-wave and S-wave are respectively strengthened in HP-component and R-component.This is not only conducive to the pick-up of the first break,but also can obtain more accurate wave velocity data,providing more accurate dynamic parameters for geotechnical engineering design.