基于扫描电镜-氮气吸脱附和压汞法的页岩孔隙结构研究

陈生蓉; 帅琴; 高强; 田亚; 徐生瑞; 黄云杰

doi:10.15898/j.cnki.11-2131/td.2015.06.006

基于扫描电镜-氮气吸脱附和压汞法的页岩孔隙结构研究

1.
中国地质大学(武汉)材料与化学学院, 湖北武汉 430074

2.
中国地质调查局油气资源调查中心, 北京 100029

3.
中国地质大学(武汉)地球科学学院, 湖北武汉 430074

基金项目: 中国地质调查局油气专项——鄂尔多斯盆地南部油气资源战略选区调查(1211302108023-1)

详细信息

作者简介: 陈生蓉, 硕士, 化学工程专业。E-mail: 15072439946@163.com

通讯作者: 帅琴, 博士, 教授, 硕士生导师, 主要从事地质分析研究。E-mail: shuaiqin@cug.edu.cn

中图分类号: P588.2;P575.2

收稿日期: 2015-01-20

修回日期: 2015-10-26

录用日期: 2015-11-08

刊出日期: 2015-06-25

Analysis of the Pore Structure of Shale in Ordos Basin by SEM with Nitrogen Gas Adsorption-Desorption

1.
Faculty of Materials Science and Chemistry, China University of Geosciences(Wuhan), Wuhan 430074, China

2.
Oil and Gas Resources Research Center, China Geological Survey, Beijing 100029, China

3.
School of Earth Sciences, China University of Geosciences(Wuhan), Wuhan 430074, China

More Information

Corresponding author: SHUAI Qin, shuaiqin@cug.edu.cn

Received Date: 20 January 2015

Revised Date: 26 October 2015

Accepted Date: 08 November 2015

Publish Date: 25 June 2015

摘要

摘要:
研究页岩孔隙结构特征, 对于探讨页岩气赋存机理有重要意义。本文采用扫描电镜(SEM)、氮气吸脱附法与压汞法对鄂尔多斯盆地页岩样品的孔隙结构进行了全面表征, 发现所研究区域页岩孔隙类型包括溶蚀孔隙、粒间孔隙和微裂缝; 孔径从几个纳米到几百个微米, BET比表面积在7~25 m²/g之间, 孔体积在0.01~0.03 cm³/g范围。研究结果表明鄂尔多斯盆地页岩具有良好的孔隙结构, 孔隙类型丰富, 孔径分布范围广泛, 其中纳米级孔隙占主导, 纳米级孔的存在有利于页岩气的存储, 微裂隙的存在则有利于页岩气的运移。说明该区域页岩气的储藏具有良好的基础环境, 页岩含气量可能较丰富。
- 页岩 /
- 孔隙结构 /
- 扫描电镜 /
- 低温氮气吸脱附 /
- 压汞法
Abstract:
Identification of porosity in shale is of great significance for exploring mechanism of shale gas. Porosity properties of the shale samples from the Ordos Basin were characterized by multiple techniques including Scanning Electron Microscope(SEM), Mercury Intrusion Porosimetry(MIP), and nitrogen gas adsorption-desorption. Results showed that the shales contained abundant pores that include dissolution pore, microfracture pore, and intergranular pore. The pore sizes range from several to several hundred nanometers. The total surface area ranges from 5.06 to 19.32 m²/g and pore volume has a range of 0.01-0.03 cm³/g. Results indicate that the OrdosBasin Shale develops pores of various types and sizes. The main type of pore is the nano-pore, which is beneficial for the storage of shale gas. Micro-cracks are beneficial for the transportation of shale gas. These results suggest that the basic environment of the Ordos Basin is suitable for the storage of shale gas and that the Ordos Basin may be rich in shale gas.
- shale /
- pore structure /
- Scanning Electron Microscope /
- low pressure nitrogen adsorption /
- mercury porosimetry

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图 1 页岩样品扫描电镜表征结果

Figure 1.

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图 2 页岩氮气吸脱附等温曲线

Figure 2.

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图 3 TOC与氮气吸脱附测试值相关性研究

Figure 3.

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图 4 页岩样品氮气吸脱附孔径分布

Figure 4.

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图 5 氮气吸脱附、高压压汞结合孔径分布

Figure 5.

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表 1 页岩样品参数

Table 1. Parameters of the shale samples

样品井号	样品编号	样品井深 (m)	总有机碳含量 (TOC，%)	镜质组反射率 (R_o，%)
1号井	YY-1	1610.13~1610.33	4.54	-
	YY-2	1611.54~1611.72	6.73	1.03
	YY-3	1616.68~1616.90	5.67	1.07
	YY-4	1621.30~1621.50	3.00	-
2号井	YY-5	1487.57~1487.77	4.57	1.08
	YY-6	1495.91~1496.11	6.34	1.06
	YY-7	1499.39~1499.65	4.47	-
3号井	YY-8	1604.57~1604.75	5.54	1.13
	YY-9	1617.92~1618.12	6.03	-
	YY-10	1618.86~1619.00	5.95	1.02

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基于扫描电镜-氮气吸脱附和压汞法的页岩孔隙结构研究

1. 中国地质大学(武汉)材料与化学学院, 湖北 武汉 430074 2. 中国地质调查局油气资源调查中心, 北京 100029 3. 中国地质大学(武汉)地球科学学院, 湖北 武汉 430074

作者简介: 陈生蓉, 硕士, 化学工程专业。E-mail: 15072439946@163.com

通讯作者: 帅琴, 博士, 教授, 硕士生导师, 主要从事地质分析研究。E-mail: shuaiqin@cug.edu.cn

Analysis of the Pore Structure of Shale in Ordos Basin by SEM with Nitrogen Gas Adsorption-Desorption

1. Faculty of Materials Science and Chemistry, China University of Geosciences(Wuhan), Wuhan 430074, China 2. Oil and Gas Resources Research Center, China Geological Survey, Beijing 100029, China 3. School of Earth Sciences, China University of Geosciences(Wuhan), Wuhan 430074, China

Corresponding author: SHUAI Qin, shuaiqin@cug.edu.cn

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目录

1.
中国地质大学(武汉)材料与化学学院, 湖北武汉 430074

2.
中国地质调查局油气资源调查中心, 北京 100029

3.
中国地质大学(武汉)地球科学学院, 湖北武汉 430074

1.
Faculty of Materials Science and Chemistry, China University of Geosciences(Wuhan), Wuhan 430074, China

2.
Oil and Gas Resources Research Center, China Geological Survey, Beijing 100029, China

3.
School of Earth Sciences, China University of Geosciences(Wuhan), Wuhan 430074, China