页岩油储层层理缝渗吸机制和渗吸模式

doi:10.3969/j.issn.1006-6535.2021.05.023

特种油气藏 ›› 2021, Vol. 28 ›› Issue (5): 161-167.DOI: 10.3969/j.issn.1006-6535.2021.05.023

页岩油储层层理缝渗吸机制和渗吸模式

谢建勇¹, 袁珍珠², 代兵³, 吴承美¹, 贾春⁴, 许锋¹, 罗群², 崔倩²

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

收稿日期:2020-10-09 修回日期:2021-08-10 出版日期:2021-10-15 发布日期:2022-02-17
通讯作者: 袁珍珠(1997—),女,2019年毕业于西安石油大学地质工程专业,现为中国石油大学(北京)地质资源与地质工程专业在读硕士研究生,从事页岩油与致密油方面的研究工作。
作者简介:谢建勇(1968—),男,高级工程师,1993年毕业于新疆石油学院地质勘察专业,2002年毕业石油大学(华东)油气田开发专业,获硕士学位,现主要从事油气田开发方面的研究。
基金资助:
国家自然科学基金“页岩油储层层理缝启闭与石油充注”(41672118)

Imbibition Mechanism and Model of Bedding Fractures in Shale Oil Reservoir

Xie Jianyong¹, Yuan Zhenzhu², Dai Bing³, Wu Chengmei¹, Jia Chun⁴, Xu Feng¹, Luo Qun², Cui Qian²

1. SINOPEC Northwest Oil Field Company, Urumqi, Xinjiang 831700, China;
2. China University of Petroleum (Beijing), Beijing 102249, China;
3. Sichuan Bureau of Geology & Mineral Resources, Yibin, Sichuan 644002, China;
4. Sichuan Bureau of Geology & Mineral Resources, Chengdu, Sichuan 610100, China

Received:2020-10-09 Revised:2021-08-10 Online:2021-10-15 Published:2022-02-17

摘要/Abstract

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。

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

Abstract: 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.

Key words: bedding fracture, tectonic fracture, shale oil, longitudinal seepage, resistivity method, seepage efficiency, imbibition pattern

中图分类号:

TE311

谢建勇, 袁珍珠, 代兵, 吴承美, 贾春, 许锋, 罗群, 崔倩. 页岩油储层层理缝渗吸机制和渗吸模式[J]. 特种油气藏, 2021, 28(5): 161-167.

Xie Jianyong, Yuan Zhenzhu, Dai Bing, Wu Chengmei, Jia Chun, Xu Feng, Luo Qun, Cui Qian. Imbibition Mechanism and Model of Bedding Fractures in Shale Oil Reservoir[J]. Special Oil & Gas Reservoirs, 2021, 28(5): 161-167.

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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

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