| 沁水盆地阳泉区块太原组煤系页岩孔隙结构特征 |
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| 引用本文： | 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(4):1033-1042. |
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| 作者姓名： | 李阳阳 李贤庆 张学庆 杨经纬 张博翔 肖贤明 于振锋 |
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| 作者单位： | 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 1000832.中国矿业大学(北京) 地球科学与测绘工程学院,北京 1000833.中国地质大学(北京) 能源学院,北京 1000834.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 |
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| 基金项目： | 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) |
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| 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Ro和黏土矿物含量均对煤系页岩孔隙发育产生积极影响。
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| 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 |
| 收稿时间： | 2020-12-20 |
| 修稿时间： | 2021-03-15 |
Pore Structure Characteristics of Taiyuan Formation Coal Measures Shale in the Yangquan Block of the Qinshui Basin |
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| 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——Journal of Graduate School,China University of Geosciences,2021,35(4):1033-1042. |
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| Authors: | LI Yangyang LI Xianqing ZHANG Xueqing YANG Jingwei ZHANG Boxiang XIAO Xianming YU Zhenfeng |
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| Institution: | 1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083,China2. College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083,China3. School of Energy, China University of Geosciences, Beijing 100083,China4. Lanyan Coalbed Methane Engineering Research Co.Ltd., Shanxi Gas Group, Jincheng, Shanxi 048006,China |
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| 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 Ro and clay mineral content all have a positive impact on the pore development of coal measures shale. |
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| Keywords: | coal measures shale microscopic characteristics of pores pore structure Taiyuan Formation Yangquan Block the Qinshui Basin |
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