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相位介电测井是确定含低矿化度水的油层含水饱和度的一种较为有效的方法。本文着重研究这种方法的应用效果。经与密闭取心井岩心分析资料对比,介电解释含水饱和度的平均绝对误差对于水淹层为7.4％,对于未水淹油层为10.4％。利用介电解释的含水饱和度绘制了一个区块的含水饱和度分布图,与投产初期测试含水的结果基本相符。利用解释的含水饱和度可以估算油层产水率。就17个层的统计,绝对平均误差只有4.3％。此外,还分析了岩心分析含水饱和度的误差。在现有各种资料的基础上,要求把解释误差降得很低是很难达到的。
Phase dielectric logging is a more effective method to determine the water saturation of reservoirs with low salinity water. This article focuses on the application of this method. Comparing with the core analysis data of the closed coring wells, the average absolute error of dielectric interpretation of water saturation is 7.4% for the flooded layer and 10.4% for the un-flooded reservoir. The distribution of water saturation of a block was plotted using the dielectric-induced water saturation, which was basically in agreement with the result of the initial water test. Using interpreted water saturations, it is possible to estimate oil production rates. Statistics on the 17 layers, the absolute average error of only 4.3%. In addition, the core analysis of the water saturation error is also analyzed. On the basis of all kinds of information available, it is very difficult to achieve a very low level of interpretation error.