英旺油田长8砂岩储层物性特征研究

付明义 宋元威 于珺 高潮 罗腾跃

延长石油集团研究院，陕西 西安 710075

Research Institute of Shaanxi Yanchang Petroleum Group, Xi′an 710075, China

通过铸体薄片、X线衍射、扫描电镜、常规压汞和室内敏感性实验等分析测试手段，对英旺油田长8砂岩储层的物性、微观孔隙结构及储层敏感性等特征进行详细研究。结果表明：该区长8砂岩储层属于低孔、超低渗储层，孔隙以粒间溶孔、剩余粒间孔和粒内溶孔为主，属小孔、微喉道类型，孔喉分选性一般，连通性差；长8储层敏感性以弱伤害程度为主，具有弱—无速敏、弱酸敏、弱碱敏、中等偏弱的盐敏和水敏等特点。该研究为英旺油田下一步的油气开采提供了理论依据。

The physical property, microscopic pore structure and sensitivity characteristics of Chang 8 sandstone reservoir in Yingwang Oilfield of Ordos Basin was detailedly studied based on the casting thin sections, X-ray diffraction, SEM, conventional Hg injection and indoor sensitivity test techniques. The results show that Chang 8 sandstone reservoir belongs to low porosity and ultra-low permeability reservoir in Yingwang Oilfield. The pore types mainly include intergranular dissolved pore, residual intergranular pore and intragranular dissolved pore. Small pore and micro throat are the main pore throat characteristics, which have general sorting and poor communication. Chang 8 reservoir possesses such characteristics as weak-no velocity sensitivity, weak acid sensitivity, weak alkali sensitivity, low-medium salinity sensibility and water sensitivity. The study provides a theoretical basis for further oil and gas recovery in Yingwang Oilfield.

10.6056/dkyqt201402006