| 沁水盆地武乡区块上古生界煤系页岩气储层孔隙特征和孔隙结构 |
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| 引用本文： | 张金晴,李贤庆,张博翔,张学庆,杨经纬,于振锋.沁水盆地武乡区块上古生界煤系页岩气储层孔隙特征和孔隙结构[J].现代地质,2022,36(6):1551-1562. |
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| 作者姓名： | 张金晴 李贤庆 张博翔 张学庆 杨经纬 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.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);中央高校基本科研业务费专项资金项目(2021YJSMT09);中央高校基本科研业务费专项资金项目(2022YJSMT03) |
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| 摘 要： | 储层孔隙特征和孔隙结构是影响页岩气赋存与储集的重要因素。为评价海陆过渡相高演化煤系页岩储层性质与页岩气储集性能,应用扫描电子显微镜、高压压汞、低温N2和 CO2气体吸附、微米CT扫描、核磁共振实验方法,对沁水盆地武乡区块上古生界煤系页岩气储层孔隙微观特征和孔隙结构进行了研究。结果表明,沁水盆地武乡区块上古生界煤系页岩样品中发育多种类型微观孔隙,常见粒间孔、粒内孔和微裂缝,有机质孔几乎不发育;武乡区块煤系页岩气储层样品孔隙总孔容分布在0.021 9~0.073 5 mL/g之间,平均值为0.039 9 mL/g,总比表面积主要分布在11.94~46.83 m2/g之间,平均为29.16 m2/g,其中介孔(2~50 nm)和微孔(<2 nm)是煤系页岩气储集的主要载体。煤系页岩中的高配位数孔隙数量越多,相应的孔容和孔比表面积越大,孔隙连通性越好;在孔隙数量和总孔容相差不大的前提下,山西组煤系页岩储层孔隙结构与连通性比太原组煤系页岩稍好。
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| 关 键 词： | 页岩气储层 煤系页岩 孔隙特征 孔隙结构 上古生界 武乡区块 沁水盆地 |
| 收稿时间： | 2022-05-06 |
| 修稿时间： | 2022-07-08 |
Pore Characteristics and Pore Structure of the Upper Paleozoic Coal-bearing Shale Gas Reservoir in the Wuxiang Block,Qinshui Basin |
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| ZHANG Jinqing,LI Xianqing,ZHANG Boxiang,ZHANG Xueqing,YANG Jingwei,YU Zhenfeng.Pore Characteristics and Pore Structure of the Upper Paleozoic Coal-bearing Shale Gas Reservoir in the Wuxiang Block,Qinshui Basin[J].Geoscience——Journal of Graduate School,China University of Geosciences,2022,36(6):1551-1562. |
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| Authors: | ZHANG Jinqing LI Xianqing ZHANG Boxiang ZHANG Xueqing YANG Jingwei 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. Lanyan Coalbed Methane Engineering Research Group Co. Ltd., Shanxi Gas Group, Jincheng, Shanxi 048006,China |
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| Abstract: | Reservoir pore characteristics and pore structure are the important factors affecting the occurrence and accumulation of shale gas. In order to evaluate the properties of high evolution coal-bearing shale reservoir and shale gas reservoir performance from the marine-continental transitional facies, the pore microscopic characteristics and pore structure of the Upper Paleozoic coal-bearing shale gas reservoir in the Wuxiang block of Qinshui Basin were studied by means of scanning electron microscope, high pressure mercury injection, low temperature N2 and CO2 gas adsorption, micron CT scanning and nuclear magnetic resonance experiments. The results show that various types of microscopic pores are developed in the Upper Paleozoic coal-bearing shale samples in the Wuxiang block of Qinshui Basin, including intergranular pores, intragranular pores and microfractures, and organic matter pores are almost not developed. The total pore volume of the samples of coal-bearing shale gas reservoir in the Wuxiang block is distributed 0.021,9~0.073,5 mL/g, with an average of 0.039,9 mL/g, and the total specific surface area is mainly distributed 11.94~46.83 m2/g, with an average of 29.16m2/g, of which mesopore (2-50 nm) and micropore (<2 nm) are the main carriers of the coal-bearing shale gas reservoir. The higher coordination number pores in coal-bearing shale, the larger the corresponding pore volume and specific surface area, and the better the pore connectivity. On the premise of little difference between the number of pores and the total pore volume, the pore structure and connectivity of the Shanxi Formation coal-bearing shale are slightly better than that of the Taiyuan Formation coal-bearing shale. |
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| Keywords: | shale gas reservoir coal-bearing shale pore characteristics pore structure Upper Paleozoic Wuxiang Block Qinshui Basin |
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