松辽盆地陆相页岩油地质工程一体化高效勘查关键技术与工程示范

Key Technology and Engineering Demonstration of Geology-Engineering Integration Efficient Exploration of Continental Shale Oil in Songliao Basin

我国陆相页岩油资源潜力巨大,但页岩储层具有高黏土矿物含量、强非均质性、低地层能量的特点,严重制约着我国陆相页岩油的高效勘查.围绕甜点优选、水平井钻探、体积压裂、试油求产等关键环节,综合利用吉页油1HF井系统取心、测井、录井及分析测试资料,开展地质工程一体化创新攻关.结果表明,松辽盆地青一段页岩可划分为高TOC层理型黏土质页岩和中TOC纹层型长英质页岩两种岩相类型,前者以地质甜点为主,后者以工程甜点为主;建立地质工程一体化双甜点评价标准,提出“钻砂压页”的水平井设计理念,优选出1.94 m厚的双甜点目标靶层,采用三维地球物理-地质工程一体化的超薄目标靶层导向技术,实现超薄目标靶层水平钻进1252 m,钻遇率100%的技术突破;依据超临界CO_(2)的破岩、溶蚀、驱油、增能4大优势,创新形成超临界CO_(2)+大型水力携砂复合压裂工艺及控压蓄能返排技术,实现了吉页油1HF井陆相页岩地层的大型体积改造,并获得16.4 m^(3)/d高产稳产页岩油突破,形成的地质工程一体化方法、技术、工艺及参数体系,对松辽盆地及同类型的陆相页岩油高效勘探开发具有借鉴意义.

China’s continental shale oil resources have great potential,but the shale reservoir has the characteristics of high clay mineral content,strong heterogeneity and low ground energy,which seriously restricts the efficient exploration of continental shale oil in China.Focusing on the key links such as sweet spot optimization,horizontal well drilling,stimulated reservoir volume and oil test for production,comprehensively utilizing the coring,logging,logging and analysis and test data of JYY1 Well system,innovative research has been carried out on geology-engineering integration.The results show that the shale of Qingyi Member in Songliao Basin can be divided into two lithofacies types:high TOC bedding clayey shale and medium TOC laminated felsic shale.The former is mainly geological sweet spot and the latter is mainly engineering sweet spot.In this study,the integrated“double sweet spot”evaluation standard of geology-engineering has been established.Based on our horizontal well design concept of“drilling sand and fracturing shale”,the 1.94 m thick double sweet spot target layer was selected,and the technical breakthrough of 1252 m horizontal drilling of ultra-thin target layer and 100%penetration rate was achieved by adopting the three-dimensional geophysical geology-engineering integration ultra-thin target layer guidance technology.The four advantages of supercritical CO_(2)are rock breaking,dissolution,oil displacement and energy increase.The supercritical CO_(2)+large-scale hydraulic sand carrying composite fracturing process and pressure controlled energy storage flowback technology have been innovated,which has realized the large-scale volume transformation of continental shale formation of JYY1 Well,and achieved a breakthrough in 16.4 m^(3)/d high and stable shale oil,resulting in a geology-engineering integration method,technology,process and various parameters.It has reference significance for the efficient exploration and development of continental shale oil in Songliao Basin and the same type.