Taking the Chang-8 reservoir in Yanchi area of Ordos Basin as an example, combined with thin slice identification, X-ray diffraction, high pressure mercury intrusion and core fluid flooding test, the reservoir sensitivity is quantitatively evaluated and its influencing factors are deeply analyzed. The results show that the sensitivity of the Chang-8 tight sandstone reservoir in Yanchi area of Ordos Basin is mainly characterized by moderately strong water sensitivity, weak-medium weak acid sensitivity, weak-moderate weak alkali sensitivity, and weak salt sensitivity. Reservoir sensitivity are mainly affected by clay mineral composition, rock mineralogical characteristics, pore structure and physical properties. The content and composition of clay minerals are the main factors, which should be highly valued in actual development. The research conclusions will provide important scientific support for enhanced oil recovery in the middle and late stages of the development of tight sandstone reservoirs.

以鄂尔多斯盆地盐池地区长8储层为例, 利用薄片鉴定、X射线衍射、高压压汞和岩芯流体驱替实验等手段, 对储层的敏感性开展定量评价, 并深入剖析其影响因素。结果表明, 鄂尔多斯盆地盐池地区长8致密砂岩储层的敏感性主要表现为中等偏强水敏、弱?中等偏弱酸敏、弱?中等偏弱碱敏和弱盐敏特征。储层的敏感性特征受黏土矿物成分、岩石矿物学特征、孔隙结构和物性影响, 其中黏土矿物的含量和组成是主要影响因素, 实际开发过程中应予以高度重视。研究结论可为致密砂岩油藏开发中后期提高采收率提供重要的科学依据。