黔北地区牛蹄塘组页岩矿物组成特征与脆性评价

doi:10.12108/yxyqc.20190407

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (4): 62–71.doi: 10.12108/yxyqc.20190407

黔北地区牛蹄塘组页岩矿物组成特征与脆性评价

叶亚培^1,2,3, 唐书恒^1,2,3, 郗兆栋^1,2,3, 张耀选⁴

1. 中国地质大学(北京)能源学院, 北京 100083;
2. 海相储层演化与油气富集机理教育部重点实验室, 北京 100083;
3. 非常规天然气地质评价与开发工程北京市重点实验室, 北京 100083;
4. 新疆维吾尔自治区地质勘查基金项目管理中心, 乌鲁木齐 830002

收稿日期:2019-01-15 修回日期:2019-02-20 出版日期:2019-07-21 发布日期:2019-06-21
第一作者:叶亚培(1995-),女,中国地质大学(北京)在读硕士研究生,研究方向为非常规天然气地质。地址:(100083)北京市海淀区学院路29号中国地质大学(北京)能源学院。Email:2721081906@qq.com。
通信作者: 唐书恒(1965-),男,博士,教授,主要从事非常规天然气地质与开发方面的研究工作。Email:tangsh@cugb.edu.cn。
基金资助:
国家重大科技专项"四川盆地及周缘页岩气富集规律与重点目标评价"（编号：2017ZX05035）资助

Mineral compositions and brittleness evaluation of shale of Niutitang Formation in northern Guizhou

YE Yapei^1,2,3, TANG Shuheng^1,2,3, XI Zhaodong^1,2,3, ZHANG Yaoxuan⁴

1. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, Beijing 100083, China;
3. Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing 100083, China;
4. Geological Exploration Fund Project Management Center of Xinjiang Uygur Autonomous Region, Urumqi 830002, China

Received:2019-01-15 Revised:2019-02-20 Online:2019-07-21 Published:2019-06-21

摘要/Abstract

摘要： 为研究黔北地区下寒武统牛蹄塘组页岩的矿物组成、成因识别的微观特征，并提出适合本区的页岩脆性评价方法，通过薄片鉴定、扫描电镜-能谱分析、阴极发光、元素扫描分析、X射线衍射矿物定量分析和三轴压缩实验等方法，研究了黔北地区XY1井牛蹄塘组页岩的矿物组成，并基于岩石物理与矿物组成评价页岩的脆性特征。结果表明，牛蹄塘组页岩的矿物主要由石英和黏土矿物组成，还含有少量的长石、碳酸盐矿物和黄铁矿，其体积分数分别为43.5%，30.3%，11.6%，8.3%和6.2%。在分析矿物含量与弹性模量、泊松比关系的基础上，认为牛蹄塘组下段较上段岩石脆性好，脆性矿物组合为石英、黄铁矿和碳酸盐矿物，脆性矿物体积分数为41.7%~82.3%。沉积环境的不同是造成牛蹄塘组上、下段页岩脆性差异的原因。

关键词: 页岩矿物, 成因类型, 扫描电镜, 沉积环境, 脆性分析, 牛蹄塘组, 黔北地区

Abstract: In order to study mineral composition characteristics and genesis of the shale of Lower Cambrian Niutitang Formation in northern Guizhou,and propose a new method of shale brittleness evaluation for this area, the mineral compositions of Niutitang Formation shale in XY1 well in northern Guizhou were studied by means of thin section identification,scanning electron microscopy-energy spectrum analysis,cathodoluminescence,element scanning analysis,mineral quantitative X-ray diffraction analysis and triaxial compression test,and brittleness characteristics of shale were evaluated based on petrophysics and mineral composition. The results show that the minerals of Niutitang Formation mainly consist of quartz and clay minerals,and also contain a small amount of feldspar,carbonate minerals and pyrite,with volume fractions of 43.5%,30.3%,11.6%,8.3% and 6.2%,respectively. By analyzing the relationships of mineral content with elastic modulus and Poisson's ratio,it is considered that the lower part of Niutitang Formation is more brittle than the upper part,and the brittle minerals are composed of quartz,pyrite and carbonate minerals,with the volume fraction of brittle minerals of 41.7%-82.3%. The difference of sedimentary environment is one of the reasons for the difference in rock brittleness.

Key words: shale minerals, origin types, scanning electron microscopy, sedimentary environment, brittleness evaluation, Niutitang Formation, northern Guizhou

中图分类号:

TE132

叶亚培, 唐书恒, 郗兆栋, 张耀选. 黔北地区牛蹄塘组页岩矿物组成特征与脆性评价[J]. 岩性油气藏, 2019, 31(4): 62–71.

YE Yapei, TANG Shuheng, XI Zhaodong, ZHANG Yaoxuan. Mineral compositions and brittleness evaluation of shale of Niutitang Formation in northern Guizhou[J]. Lithologic Reservoirs, 2019, 31(4): 62–71.

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黔北地区牛蹄塘组页岩矿物组成特征与脆性评价

Mineral compositions and brittleness evaluation of shale of Niutitang Formation in northern Guizhou

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