沁水盆地阳泉区块太原组煤系页岩孔隙结构特征

doi:10.19657/j.geoscience.1000-8527.2021.044

现代地质 ›› 2021, Vol. 35 ›› Issue (04): 1033-1042.DOI: 10.19657/j.geoscience.1000-8527.2021.044

沁水盆地阳泉区块太原组煤系页岩孔隙结构特征

李阳阳¹^,²(), 李贤庆¹^,²(), 张学庆¹^,², 杨经纬¹^,², 张博翔¹^,², 肖贤明³, 于振锋⁴

1.中国矿业大学(北京) 煤炭资源与安全开采国家重点实验室,北京 100083
2.中国矿业大学(北京) 地球科学与测绘工程学院,北京 100083
3.中国地质大学(北京) 能源学院,北京 100083
4.山西燃气集团蓝焰煤层气工程研究有限责任公司,山西晋城 048006

收稿日期:2020-12-20 修回日期:2021-03-15 出版日期:2021-08-10 发布日期:2021-09-08
通讯作者: 李贤庆
作者简介:李贤庆,男,教授,博士生导师,1967年出生,矿产普查与勘探专业,从事煤油气地质、有机地球化学、有机岩石学等方面的教学和科研工作。Email: Lixq@cumtb.edu.cn。
李阳阳,女,硕士研究生,1996年出生,地质工程专业,从事煤系非常规油气地质研究工作。Email: 995857507@qq.com。
基金资助:
国家自然科学基金项目(U1810201);国家自然科学基金项目(41572125);中央高校基本科研业务费专项资金项目(2020YJSMT02)

Pore Structure Characteristics of Taiyuan Formation Coal Measures Shale in the Yangquan Block of the Qinshui Basin

LI Yangyang¹^,²(), LI Xianqing¹^,²(), ZHANG Xueqing¹^,², YANG Jingwei¹^,², ZHANG Boxiang¹^,², XIAO Xianming³, YU Zhenfeng⁴

1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083,China
2. College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083,China
3. School of Energy, China University of Geosciences, Beijing 100083,China
4. Lanyan Coalbed Methane Engineering Research Co.Ltd., Shanxi Gas Group, Jincheng, Shanxi 048006,China

Received:2020-12-20 Revised:2021-03-15 Online:2021-08-10 Published:2021-09-08
Contact: LI Xianqing

摘要/Abstract

摘要：

页岩孔隙结构是影响页岩气赋存与储集的基本因素之一。为研究高演化海陆过渡相煤系页岩的孔隙结构和评价页岩气储集能力,主要运用扫描电子显微镜、高压压汞、低温N₂和CO₂气体吸附实验方法,对沁水盆地阳泉区块太原组海陆过渡相煤系页岩孔隙微观特征与孔隙结构进行了研究,并分析了太原组煤系页岩孔隙发育的影响因素。研究结果表明:沁水盆地阳泉区块太原组海陆过渡相煤系页岩孔隙度介于2.54%~12.03%之间,平均为6.61%;发育多种类型的孔隙,常见粒间孔、粒内孔和微裂缝,有机质孔不发育;太原组煤系页岩孔隙总孔容介于0.025 5~0.054 7 mL/g之间(平均0.040 1 mL/g),总比表面积介于12.34~43.38 m²/g之间(平均28.74 m²/g),微孔(<2 nm)和介孔(2~50 nm)是页岩气储集的主要载体;有机碳含量、成熟度R_o和黏土矿物含量均对煤系页岩孔隙发育产生积极影响。

关键词: 煤系页岩, 孔隙微观特征, 孔隙结构, 太原组, 阳泉区块, 沁水盆地

Abstract:

Pore structure of shale is one of the basic factors affecting shale gas occurrence and storage. In order to study the pore structure of highly evolved marine-continental transitional facies coal measures shale and to evaluate the storage capacity of shale gas, the scanning electron microscopy, high-pressure mercury intrusion, low-temperature N₂ and CO₂ gas adsorption experimental methods were mainly adopted in this paper. The microscopic characteristics of pores and pore structures of the marine-continental transitional facies shales from the Taiyuan Formation in the Yangquan Block of the Qinshui Basin were studied, and the factors affecting the pore development of the Taiyuan Formation shale were analyzed. The research results show that the porosity of the marine-continental transitional facies coal measures shale of the Taiyuan Formation in the Yangquan Block of the Qinshui Basin ranges from 2.54% to 12.03%, with an average of 6.61%. There are developed various types of pores. The inter-granular pore, intra-granular pore, and micro-crack are common. The organic pore is not developed. The total pore volume of the Taiyuan Formation coal measures shale is between 0.025,5 mL/g and 0.054,7 mL/g (average 0.040,1 mL/g), and the total specific surface area of pore is between 12.34 m²/g and 43.38 m²/g (average 28.74 m²/g). Micropore (<2 nm) and mesopore (2 nm to 50 nm) are the main carrier of shale gas storage. Organic carbon content, maturity R_o and clay mineral content all have a positive impact on the pore development of coal measures shale.

Key words: coal measures shale, microscopic characteristics of pores, pore structure, Taiyuan Formation, Yangquan Block, the Qinshui Basin

中图分类号:

TE132.2

李阳阳, 李贤庆, 张学庆, 杨经纬, 张博翔, 肖贤明, 于振锋. 沁水盆地阳泉区块太原组煤系页岩孔隙结构特征[J]. 现代地质, 2021, 35(04): 1033-1042.

LI Yangyang, LI Xianqing, ZHANG Xueqing, YANG Jingwei, ZHANG Boxiang, XIAO Xianming, YU Zhenfeng. Pore Structure Characteristics of Taiyuan Formation Coal Measures Shale in the Yangquan Block of the Qinshui Basin[J]. Geoscience, 2021, 35(04): 1033-1042.

图/表 11

图1 沁水盆地区域构造及阳泉区块井位图

Fig.1 Regional structure of the Qinshui Basin and well location map of the Yangquan Block

表1 沁水盆地阳泉区块太原组煤系页岩样品的基本地球化学特征

Table 1 Basic geochemical characteristics of the Taiyuan Formation coal measures shale samples of the Yangquan Block in the Qinshui Basin

样品号	深度/m	有机碳含量 TOC/%	石英含量/%	碳酸盐矿物含量/%	黏土矿物含量/%	其他矿物含量/%	镜质体反射率R_o/%	最高峰温 T_max/℃
YQ-01	471.5	1.98	27.0	0.8	71.4	0.8	-	558
YQ-02	485.5	2.11	29.6	2.5	63.9	4.0	-	554
YQ-03	501.6	2.11	33.5	1.4	61.2	3.9	2.48	574
YQ-04	508.3	2.20	50.2	2.5	47.3	0.0	-	580
YQ-05	517.3	2.48	60.0	1.3	28.8	9.9	2.41	564
YQ-06	544.2	1.03	38.3	1.5	57.3	2.9	-	573
YQ-07	557.2	0.98	34.8	4.5	56.4	4.3	2.09	574
YQ-08	576.6	1.16	50.1	1.7	46.3	1.9	-	572
YQ-09	584.7	2.50	37.3	3.5	57.1	2.1	2.58	592
YQ-10	603.0	1.98	36.4	21.6	23.9	18.1	2.46	576
YQ-11	615.0	0.92	40.2	1.9	48.5	9.4	-	582
YQ-12	624.5	0.73	35.2	8.9	44.4	11.5	-	581
YQ-13	477.3	1.75	28.6	3.9	65.5	2.0	-	546
YQ-14	466.5	3.63	41.2	2.2	54.0	2.6	2.56	541
YQ-15	469.6	21.21	54.3	8.8	23.9	13.0	-	541

图2 沁水盆地阳泉区块太原组煤系页岩样品扫描电镜图像

Fig.2 Scanning electron microscope image of the Taiyuan Formation coal measures shale samples of the Yangquan Block in the Qinshui Basin

图3 沁水盆地阳泉区块太原组煤系页岩样品N2吸附-脱附曲线和CO2吸附-脱附曲线

Fig.3 N2 adsorption-desorption curve and CO2 adsorption-desorption curve of the Taiyuan Formation coal measures shale samples of the Yangquan Block in the Qinshui Basin

图4 沁水盆地阳泉区块太原组煤系页岩孔隙孔容和比表面积分布

Fig.4 Distribution of pore volume and specific surface area of the Taiyuan Formation coal measures shale of the Yangquan Block in the Qinshui Basin

图5 沁水盆地阳泉区块太原组煤系页岩孔容与比表面积的关系

Fig.5 Relationship between pore volume and specific surface area of the Taiyuan Formation coal measures shale of the Yangquan Block in the Qinshui Basin

图6 沁水盆地阳泉区块太原组煤系页岩孔径分布

Fig.6 Pore size distribution of the Taiyuan Formation coal measures shale of the Yangquan Block in the Qinshui Basin

图7 沁水盆地阳泉区块太原组煤系页岩TOC与孔容、比表面积、孔隙度的关系

Fig.7 Relationship between TOC and pore volume, specific surface area and porosity of the Taiyuan Formation coal measures shale of the Yangquan Block in the Qinshui Basin

图8 沁水盆地阳泉区块太原组煤系页岩成熟度Ro与孔容、比表面积的关系

Fig.8 Relationship between maturity Ro and pore volume, specific surface area of the Taiyuan Formation coal measures shale of the Yangquan Block in the Qinshui Basin

图9 沁水盆地阳泉区块太原组煤系页岩矿物成分含量与孔容的关系

Fig.9 Relationship between mineral component content and pore volume of the Taiyuan Formation coal measures shale of the Yangquan Block in the Qinshui Basin

图10 沁水盆地阳泉区块太原组煤系页岩矿物成分含量与孔隙比表面积的关系

Fig.10 Relationship between mineral component content and pore specific surface area of the Taiyuan Formation coal measures shale of the Yangquan Block in the Qinshui Basin

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沁水盆地阳泉区块太原组煤系页岩孔隙结构特征

Pore Structure Characteristics of Taiyuan Formation Coal Measures Shale in the Yangquan Block of the Qinshui Basin

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