石油实验地质Issue(6)：729-736,8.DOI:10.11781/sysydz201506729
鄂尔多斯盆地镇北地区长4＋5储层微观孔隙结构研究
Microscopic pore structure of the fourth and fifth members of the Yanchang Formation in Zhenbei area of the Ordos Basin
摘要
Abstract
The fourth and fifth members of the Yanchang Formation ( Chang4+5) in Zhenbei area of the Ordos Basin are low⁃permeability reservoirs of diagenetic origin. Conventional methods such as thin section analysis, scanning electron microscopy and physical properties determination failed to analyze the microscopic pore struc⁃ture of these reservoirs. We used conventional methods and applied constant rate mercury penetration to study the controlling factors to quantitatively determine microscopic pore structure. The microscopic pore structure of the Chang4+5 reservoirs was mainly impacted by diagenetic effects. When mechanical compaction and carbonate cementa⁃tion were weaker and feldspar dissolution was more intense, intergranular pores and dissolution pores would be more developed, resulting in better connectivity and higher permeability. Microscopic pore structure and permeability were mainly controlled by throat radius. Generally, if average throat radius was >0.12μm, permeability would be higher, the smaller the pore/throat radius ratio, the better the microscopic pore structure, the greater the reservoir quality index ( RQI) , and the higher liquid oil yield, especially when the average throat radius was <1.26μm. Throats controlled the quality of the microscopic pore structure of low permeability reservoirs.关键词
恒速压汞/储层品质因子/微观孔隙结构/低渗透储层/延长组/镇北地区/鄂尔多斯盆地Key words
contant-rate mercury/reservoir quality index ( RQI)/microscopic pore structure/low permeability reservoir/Yanchang Formation/Zhenbei area/Ordos Basin分类
能源科技引用本文复制引用
李成,郑庆华,张三,柳益群,汪伶俐,梁晓伟..鄂尔多斯盆地镇北地区长4＋5储层微观孔隙结构研究[J].石油实验地质,2015,(6):729-736,8.基金项目
教育部科技发展中心高等学校博导基金（20106101110020）、大陆动力学国家重点实验室（西北大学）重点基金项目（ BJ08133－3）、国家自然科学基金项目（41390451）和国家重点基础研究发展计划（973计划）项目（2014CB239003）资助。 （）
