利用P波源三分量VSP检测裂缝

Fracture detection using three-component VSP data of P-wave source

本文利用P波源三分量VSP资料进行裂缝检测。首先通过对水平分量检波器定位，求取水平分量和垂直分量，进行P－SV波分离处理；然后对处理后的数据进行横波分裂分析，求取快横渡偏振方位，确定裂缝方位。文中给出了实际资料的处理过程，其中有定位水平分量、水平横向分量和垂直横向分量的求取以及震点的快横波偏振方向反演结果，即裂缝方向。实际资料分析表明，采用这套方法检测出的裂缝结构可以用于裂缝性储层的描述。

Three-component VSP data of P-wave source are applied to fracture detection.The fracture detection involves the following steps:. Obtain horizontal component and vertical component by knowing the az-imuth of horizontal component of geophone-. Separate out P-SV wave-. Analyse shear wave splitting in processed data.. Ascertain the polarization azimuth of fast shear wave to determine fractureazimuth.Real data processing procedure is described, which includes:. Separating out the azimuth-determinative horizontal component, horizontaltransverse component and vertical transverse component;. inversion of polarization azimuth (fracture azimuth) of fast shear wave atsource point.Actual data analysis shows that the fracture system found out by the method are applicable to description of fractured reservoir.