以X射线衍射、扫描电镜、岩电实验、物性分析报告、试油等资料为基础 ,研究临南油田夏 5 2块沙三中泥质砂岩油层低电阻的成因机理 ,认为富含高岭石的泥质砂岩油层 ,泥质附加导电性不是电阻率降低的主导因素 ,更重要的是高束缚水饱和度和高地层水矿化度。泥质含量高 ,但泥质对中 -高孔隙度储层物性影响小。中 -高孔隙度岩样电阻率指数与含水饱和度 (I-Sw)关系曲线与低孔隙度岩样相比 ,差别较大 ,故将孔隙度作为选取含水饱和度解释模型和测井评价的约束条件 ,解释精度和评价级别都有所提高 Based on the data of X-ray diffraction, scanning electron microscopy, petroclival experiments, physical property analysis and test oil, the genesis mechanism of low resistance in Shazan middle shaly sand reservoirs in Linnan oil field was studied. It is concluded that kaolinite Of the shaly sandstone reservoirs, the additional conductivity of the shale is not the dominant factor in the resistivity reduction, more importantly, the high irreducible water saturation and the high formation water salinity. Mud content is high, but muddy has little effect on physical properties of medium-high porosity reservoirs. The relationship between the resistivity index and water saturation (I-Sw) of medium-high porosity rock samples is quite different from that of low-porosity rock samples. Therefore, the porosity is taken as the model for selecting water saturation and logging evaluation Constraints, interpretation accuracy and evaluation levels have increased