Abstract: Electrical measurements on core samples enable the evaluation of the water saturation of hydrocarbon reservoirs. The accuracy of such measurements depends on the chosen laboratory technique. Comparison of electrical data of 8 sandstone cores by the 'normal injection' and the 'porous plate' techniques shows that the 'porous plate' can yield valid results, and the electrical resistivity and saturation exponent are lower than those from the 'normal injection'. The reason of the difference between the two techniques is the saturation distributions. Measurement for each sample performed by the 'porous plate' technique takes much more time than by the 'normal injection' technique.

Key words: electrical resistivity, porous plate, normal injection, saturation, saturation exponent

摘要： 岩石电性数据是油田含油饱和度和储量评估的关键参数，实验方法对岩石电性数据 测定的准确性具有很大影响。在储层条件（储层温度、压力）下，采用常规法和隔板法两种 驱替方式，对玉门油田某区8块砂岩样品进行岩心驱替实验。实验结果表明，相对于常规法 ，隔板法能够使岩心达到更低的束缚水饱和度；常规驱替方法会产生末端效应，岩心内饱和 度分布不均匀，隔板法可以避免末端效应；在同一饱和度状态下，隔板法测得的岩心电阻率 、电阻率系数和饱和度指数n低于常规驱替方法测得的数据，不同驱替方式造成的流体 分布形式的差别是导致实验结果不一致的原因。虽然隔板法能够得到较好的岩石电性数据，但是 实验周期比较长。

关键词: 岩心电阻率, 隔板法, 常规法, 饱和度, 饱和度指数