电阻率测井原理在饱和度测量中的应用

针对在实验室条件下测量岩石孔隙内的含水饱和度分布受测量方法和精度的限制，而CT、核磁图像等方法具有实验费用高、不适合频繁使用等特点，比较了电阻率测井原理及实验测量结果，发现在一定浓度范围内，溶液电阻值与离子浓度呈线性关系；油藏条件下，岩石电阻值与探针间距离呈线性关系，岩石内的含水饱和度值可以由测量的岩石电阻值计算得到。研究认为：为提高测量精度，实验前必须进行溶液浓度与电阻值关系和CT图像饱和度值与电阻值关系的两项校正。进行了平板模型的驱替实验，证实了这种方法能清晰反映出不同阶段的平面含水变化情况；相对于其他测量方法而言，该方法具有方便易行、安全等优点而适合实验室条件下使用。

APPLICATION OF RESISTIVITY LOGGING IN MEASURING WATER SATURATION

Restricted by measuring method and accuracy,it is difficult to measure water saturation in rock porosity in Lab,the ways,such as CT,NMR are costly and not suitable to be applied frequently,After comparing resistivity logging and practical measuring data,it is found that in a certain range of concentration,there is a linear relationship between solution resistivity value and ion concentration,under the condition of reservoir,there is a linear relationship between rock resistivity value and the distance among probes,the water saturation value can be calculated by measuring the resistivity value.Research indicates in order to improve accuracy,two kinds of correcting,the relationship between solution concentration and resistivity value and the relationship between CT imaging value and resistivity value,must be carried on prior to experiment.The flooding experiment of plate model is conducted,which verifies the way can clearly reflected water-containing variation in different stage.Compared with other measuring ways,the way presented in this paper is easy to carry on and safer.