Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2020, Vol. 56 ›› Issue (2): 253-261.DOI: 10.13209/j.0479-8023.2019.121

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Sensitivity Evaluation and Influencing Factors Analysis of Tight Sandstone Reservoirs: A Case Study of the Chang-8 Reservoir in Yanchi Area of Ordos Basin

CHAI Guangsheng1,2, SHI Yongmin1,2,†, DU Shuheng3, WEI Yun4, ZHANG Zhiqiang1,2, GUO Chun’an1,2, SUN Tong1,2   

  1. 1. School of Earth and Space Sciences, Peking University, Beijing 100871 2. Oil and Gas Research Center, Peking University, Beijing 100871 3. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 4. Experimental Testing Research Institute of Xinjiang Oilfield Company, PetroChina, Karamay 834000
  • Received:2019-03-18 Revised:2019-09-30 Online:2020-03-20 Published:2020-03-20
  • Contact: SHI Yongmin, E-mail: sym(at)


柴光胜1,2, 师永民1,2,†, 杜书恒3, 魏云4, 张志强1,2, 郭春安1,2, 孙彤1,2   

  1. 1. 北京大学地球与空间科学学院, 北京 100871 2. 北京大学石油与天然气研究中心, 北京 100871 3. 中国科学院力学研究所, 北京 100190 4. 中国石油新疆油田分公司实验检测研究院, 克拉玛依 834000
  • 通讯作者: 师永民, E-mail: sym(at)
  • 基金资助:


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.

Key words: tight sandstone reservoirs, sensitivity, Ordos Basin, Yanchi area, Chang-8 reservoir


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。

关键词: 致密砂岩储层, 敏感性, 鄂尔多斯盆地, 盐池地区, 长8储层