井中低频声激发极化敏感性分析

Sensitivity analysis of borehole low-frequency sonically induced polarization

1. 中国地质大学,北京100083;2. 辽河油田测井公司,盘锦124011;3. 大庆油田物探公司,大庆163357

China University of Geosciences, Beijing 100083

声激发极化是双相孔隙介质中声场向电磁场转化的过程,是两种地球物理波场间作用与转换的结果。本文采用简化的Biot-Rosenbaum模型模拟计算均匀各向同性孔隙饱和介质中的斯通利波,根据某油田一口井油水层段的实际测井资料模拟计算低频斯通利波激发极化敏感系数,详细分析了低频斯通利波激发极化对斯通利波频率和地层参数的敏感性,证实了低频斯通利波激发极化电位测量信号对地层含油性的分辨能力。

Sonically induced polarization is a transformation pro cess of sonic fie ld to electromagnetic field in two-phase porous medium. It is a result of inter a ction and transformation of two kinds of geophysical wavefield. The simplified B iot-Rosenbaum model is used here to compute the Stoneley wave in homogeneous is o tropic fluid-saturated porous medium. The authors calculate the induced polariz ation sensitivity coefficient of low frequency Stoneley wave from real well log data in an oil-water segment of a borehole, analyze in detail the sensitivity o f low frequency Stoneley wave induced polarization to Stoneley wave frequency and strata parameter, and verify the resolving ability of electric potential measure ment signals of low ferquency Stoneley wave induced polarization to hydrocarbon in strata.