临南油田夏52块沙三中泥质砂岩油层的测井评价

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

Log Evaluation of Hydrocarbon Bearing Shaly Sands in the middle of Sand Three of Block Xia - 52 in Linnan Oiffield

The origins of low-resistivity hydrocarbon bearing shaly sands in the middle of Sand Three of Block Xia-52 of Linnan Oilfield is analyzed based on experiment of X-diffraction, scan electric-mirror, rock electrical experiment, property analysis of oil formation and well testing data. The result is that the additional conductivity of clay mineral is not the dominant cause when kaolinite is riched in hydrocardon bearing shaly sands, while the more important factors are high irreducible water saturation and high salinity. Shale content is higher but shale has lower influence on formation property with mid-high poresity. The relation between resistivity index and water saturation of mid-high poresity samples is different from the one of low poresity samples. Poresity is considered to be a controlling condition for choosing saturation and log evalution . The interpretation precision and evalution result is evidently improved.