页岩油储层层理缝渗吸机制和渗吸模式  

Imbibition Mechanism and Model of Bedding Fractures in Shale Oil Reservoir

作　　者：谢建勇 袁珍珠 代兵 吴承美 贾春 许锋 罗群[2] 崔倩 Xie Jianyong;Yuan Zhenzhu;Dai Bing;Wu Chengmei;Jia Chun;Xu Feng;Luo Qun;Cui Qian(SINOPEC Northwest Oil Field Company,Urumqi,Xinjiang 831700,China;China University of Petroleum(Beijing),Beijing 102249,China;Sichuan Bureau of Geology&Mineral Resources,Yibin,Sichuan 644002,China;Sichuan Bureau of Geology&Mineral Resources,Chengdu,Sichuan 610100,China)

机构地区：[1]中国石油新疆油田分公司,新疆乌鲁木齐831700 [2]中国石油大学(北京),北京102249 [3]四川省地质矿产勘查开发局,四川宜宾644002 [4]四川省地质矿产勘查开发局,四川成都610100

出　　处：《特种油气藏》2021年第5期161-167,共7页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金“页岩油储层层理缝启闭与石油充注”(41672118)。

摘　　要：页岩油主要采用水平井分段压裂形成纵向缝(构造缝)的开发理念,并未考虑开启层理缝的渗吸作用。为进一步研究层理缝对页岩油开发的作用,以新疆吉木萨尔地区页岩油为例,通过岩心渗吸模拟实验、铸体薄片观察、CT扫描等方法,分析层理缝、构造缝渗吸效率。结果表明:构造缝模型渗吸深度为1.5 cm,层理缝模型渗吸深度可达1.0 cm,层理缝在表层渗吸效率较高;在开启构造缝的基础上开启同样面积的层理缝,渗吸效率可提高4.3%左右;根据渗吸物理模拟实验,建立起构造缝与层理缝不同的油水渗吸转换模式,表明在构造缝渗吸的基础上,利用层理缝的渗吸作用,可大大提高页岩油的开发效率。该研究为页岩油藏优化压裂方式、提高页岩油采收率提供了理论依据。Shale oil is mainly developed in line with the concept of making longitudinal fractures(tectonic fractures)by staged fracturing in horizontal well,without consideration of the imbibition effect of opening bedding fractures.To further study the role of bedding fractures on shale oil development,the imbibition efficiency of bedding and tectonic fractures was analyzed by means of core imbibition simulation experiment,cast slice observation and CT scanning,taking shale oil in Jimusaer Area,Xinjiang as an example.The results showed that the imbibition depth of tectonic fracture model was 1.5 cm,the imbibition depth of bedding fracture model was 1.0 cm,and the imbibition efficiency of bedding fracture was higher in surface layer;the imbibition efficiency can be increased by about 4.3%by opening the bedding fractures with the same area on the basis of opening tectonic fractures;according to the physical simulation experiment of imbibition,different oil-water imbibition conversion modes were established for tectonic fracture and bedding fracture,indicating that the development efficiency of shale oil can be greatly improved by the imbibition effect of bedding fracture on the basis of structural fracture imbibition.This study provides a theoretical basis for fracturing method optimization and shale oil recovery enhancement.

关 键 词：层理缝 构造缝 页岩油 纵向渗吸 电阻率法 渗吸效率 渗吸模式 

分 类 号：TE311[石油与天然气工程—油气田开发工程]