岩石导电效率及其与含水饱和度之间的关系

The electrical efficiency of rocks and its relationship with water saturation

1. 江汉石油学院物探系, 荆州 434102;2. 石油大学（北京）地科系, 北京 102200;3. 塔里木石油勘探开发指挥部研究中心, 库尔勒 841000

Department of Geophysical Exploration, Jianghan Petroleum Institute. Jingzhou 434102

通过对塔里木盆地几口井岩电关系的研究, 发现导电效率理论能较好地描述岩石的电学性质。对单块岩样, 导电效率与含水孔隙度有很好的线性关系。单块岩样之间, 由于孔隙结构的不同, 这种线性关系的斜率和截距有差别, 斜率与孔隙度存在相关关系, 可以用孔隙度来估算；全含水岩石的导电效率与孔隙度存在线性关系, 用此关系可估算截距。本文绘出了用该理论计算含水饱和度的方法, 计算含水饱和度的模型误差小于或接近于阿尔奇方程。

Through the study of rock-electricity relation of several boreholes in the Tarim basin, it isfound that the electrical efficiency theory can well describe the electrical property of rocks. For asingle rock sample, there is an exce1lent linear relationship between the electrical efficiency andwater porosity. Among rock samples, the slope and intercept of the 1inear re1ationship aredifferent because of the difference in pore structures. The slope bears a relation to the porosity andcan be estimated with the porosity. A linear relationship is also observed between the electricalefficiency of completely water-saturated rocks and the porosity, which can be used to estimate theintercept. An approach to calcu1ate the water saturation by the use of the theory is given in thispaper. The results show that the model error for water saturation calculation is less than orapproximately equal to that of the Archie equation.