用 J 函数法求取碳酸盐岩储层饱和度方法探讨

准确求取非均质碳酸盐岩储层含水饱和度一直是测井解释工作的一大难题（尤其是在缺乏密闭取 心等直接确定岩心含水饱和度资料的情况下）。 根据毛管压力曲线、物性分析数据及 RFT 测试等资料， 并以中东某油田为例，探讨了利用毛管压力曲线计算非均质碳酸盐岩储层原始含水饱和度的方法（ J 函数 法）。 利用此方法计算出的原始含水饱和度与相渗实验分析结果及试油结果均吻合较好。 此次研究为缺 乏岩心含水饱和度资料的非均质碳酸盐岩储层含水饱和度的求取提供了一种合理、可靠的计算方法。

Using J-function method to calculate saturation of carbonate reservoirs

Calculating the initial water saturation of heterogeneous carbonate reservoirs is always a challenge to log interpretation, especially under the condition of lack of data such as sealed core which can directly determine the water saturation. Taking an oilfield in the Middle East as an example, according to the data of capillary pressure curve, physical properties analysis and RFT test, this paper discussed J-function method that uses capillary pressure curve to calculate initial water saturation of heterogeneous carbonate reservoirs. The water saturation calculated by this method agrees quite well with that interpreted by relative permeability experiment data and oil test results. This study provides a reasonable and reliable method to ensure water saturation of heterogeneous carbonate with no water saturation of cores.