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吉木萨尔凹陷芦草沟组致密油聚集过程模拟及主控因素分析
苏阳1,查明1,曲江秀1,丁修建1,冯其红2,王森2,张薇2
(1.中国石油大学(华东)地球科学与技术学院,山东青岛 266580;2.中国石油大学(华东)石油工程学院,山东青岛 266580)
摘要:
以芦草沟组为研究对象,采用物理模拟和数值模拟方法,综合铸体薄片、高压压汞和微米CT等分析测试,分析致密储层含油饱和度增长过程,揭示致密油聚集过程及其主控因素。结果表明:致密储层含油饱和度增长模式分3种,相渗曲线和最终含油饱和度存在较大差异;致密油聚集过程及渗流特征主要受充注压力和孔隙结构控制,充注压力是含油饱和度增长的必要条件,孔隙结构是导致含油饱和度增长过程存在差异的主要因素,其中孔喉半径和配位数控制作用明显;孔喉半径增大,水相相对渗透率减小,油相相对渗透率和有效渗透率均增大;配位数增大,水相相对渗透率增大,油相相对渗透率减小,但油相有效渗透率呈指数增大,石油渗流能力增强,储层含油饱和度增长速度呈逐渐增大的趋势,最终含油饱和度也逐渐增大。
关键词:  致密油  聚集过程  物理模拟  数值模拟  吉木萨尔凹陷
DOI:10.3969/j.issn.1673-5005.2019.06.002
分类号::TE 122.1
文献标识码:A
基金项目:国家重点基础研究发展计划“973”项目(2014CB239005);致密油气地质与勘探创新引智计划(B16045);国家青年科学基金项目(41702143);山东省自然科学基金项目(ZR2016DL06)
Simulations on oil accumulation processes and controlling factors in tight reservoirs of Lucaogou Formation of Jimsar Sag
SU Yang1, ZHA Ming1, QU Jiangxiu1, DING Xiujian1, FENG Qihong2, WANG Sen2, ZHANG Wei2
(1.School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China;2.School of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China)
Abstract:
Tight oil in Lucaogou Formation is treated as the target. In combination with thin section, high-pressure mercury injection and micro-CT, physical simulation and numerical simulation are conducted to analyze growth process of oil saturation of tight reservoirs, aiming to demonstrate the accumulation processes and their controlling factors.Growth pattern of oil saturation is divided into three types, which show significant differences in the oil-water relative permeability curve and final oil saturation.The accumulation process and flow characteristics are dominantly influenced by the injection pressure and pore structure of tight reservoirs. The injection pressure is a prerequisite for the increase of oil saturation, and pore structure is the main factor to control the growth pattern of oil saturation. Variations in pore throat radius and coordination number play a significant controlling role in the growth pattern of oil saturation. As pore throat radius increases, water relative permeability decreases, whereas oil relative permeability and effective permeability increase. Increase of coordination number results in the increase of water relative permeability and decrease of oil relative permeability. However, oil effective permeability magnifies exponentially and oil flowing capability is strengthened. As a result, growth rate of oil saturation and final oil saturation increase gradually.
Key words:  tight oil  accumulation processes  physical simulation  numerical simulation  Jimsar Sag
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