摘要
四川盆地侏罗系油藏勘探开发思路经历了常规孔隙型油藏、裂缝型油藏、裂缝—孔隙型油藏,到目前非常规致密油和页岩油的转变,油藏类型的划分引起了极大争议。由于四川盆地侏罗系油藏是不受构造圈闭控制、大面积连续分布的油藏,在烃源分布范围内,油藏富集主要受控于储层和裂缝,储集体主要为砂岩、灰岩和页岩混层。因此,油藏分类方法首先参照国家标准中主要储集体渗透率界线划分常规油藏和非常规油藏;然后根据各类储层中石油贮藏量占比不同,再细分常规油藏为孔隙型、裂缝型、裂缝—孔隙型和孔隙—裂缝型四类油藏,非常规油藏为致密油和页岩油两类油藏。在此基础上,重新疏理四川盆地侏罗系油藏分类,油藏以页岩油为主,其次为致密油,只发现一处常规孔隙—裂缝型油藏;页岩油主要分布在凉高山组、大安寨段和东岳庙段富有机质页岩层系中,沙一段、凉下段和珍珠冲段河道砂油藏为致密油,致密灰岩和致密粉砂岩主要为隔夹层或顶底板。分类结果对勘探开发具有重要意义。
The exploration and development ideas of Jurassic reservoir in Sichuan Basin have experienced the transition from conventional pore reservoir,fractured reservoir,fracture-pore reservoir,to unconventional tight oil and shale oil,and the classification of reservoir types has aroused great controversy.The Jurassic reservoir in Sichuan Basin is a large and continuous reservoir that is not controlled by structural traps.In the range of hydrocarbon source distribution,reservoir enrichment is mainly controlled by reservoirs and fractures,and the reservoirs are mainly mixed layers of sandstone,limestone and shale.Therefore,the reservoir is divided into conventional and unconventional reservoirs according to the permeability boundaries of major reservoirs in the national standard.Then,according to the different proportion of oil reserves in different reservoirs,the conventional reservoirs are subdivided into four types:pore,fracture,fracture-pore and pore-fracture,and the unconventional reservoirs are subdivided into tight oil and shale oil.On this basis,the Jurassic reservoirs in Sichuan Basin were re-classified.The reservoirs were mainly shale oil,followed by tight oil.Only one conventional pore-fracture reservoir was found.Shale oil is mainly distributed in organic-rich shale layers of Lianggaoshan Formation,Da anzhai Member and Dongyuemiao Member.Channel sand reservoirs of Shaximiao 1 Member,Lower Member of Lianggaoshan Formation and Zhenzhuchong Member are tight oil,while tight limestone and tight siltstone are mainly interbedded or roof-to-floor.Such classification is of great significance to exploration and development.
作者
金涛
白蓉
郭蕊莹
周春林
邓燕
李秀清
刘敏
李育聪
JIN Tao;BAI Rong;GUO Ruiying;ZHOU Chunlin;DENG Yan;LI Xiuqing;LIU Min;LI Yucong(Exploration and Development Research Institute of PetroChina Southwest Oil and Gas Field Company,Chengdu,Sichuan,610041,China)
出处
《天然气与石油》
2021年第3期73-81,124,共10页
Natural Gas and Oil
基金
国家科技重大专项“四川盆地致密油资源潜力、甜点区预测与关键技术应用”(2016ZX05046-006-008)。
关键词
四川盆地
侏罗系
油藏类型
致密油
页岩油
导管引流
Sichuan Basin
The Jurassic
Reservoir type
Tight oil
Shale oil
Drainage by catheter
