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ZHANG Ningyuan，YAO Suping. Nanopore structure and surface roughness in brittle tectonically deformed coals explored by atomic force microscopy[J]. Coal Geology & Exploration，2022，50(5)：32−42. DOI: 10.12363/issn.1001-1986.21.09.0500
Citation: ZHANG Ningyuan，YAO Suping. Nanopore structure and surface roughness in brittle tectonically deformed coals explored by atomic force microscopy[J]. Coal Geology & Exploration，2022，50(5)：32−42. DOI: 10.12363/issn.1001-1986.21.09.0500
shu

Nanopore structure and surface roughness in brittle tectonically deformed coals explored by atomic force microscopy

  • Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

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  • Received Date: September 13, 2021
  • Revised Date: October 13, 2021
  • Accepted Date: March 17, 2022
  • Available Online: May 04, 2022
  • Published Date: May 24, 2022
    Graphical Abstract
    • Abstract
  • The pore structure of coal is the key to coalbed methane (CBM) exploration and exploitation, and coal mining safety. Compared to primary coals, tectonically deformed coals (TDCs) have stronger heterogeneity and are of great importance in coal reservoir study. Here, the pore structure and surface roughness of brittle TDCs were obtained with atomic force microscopy (AFM) and NanoScope Analysis and Gwyddion software. The results show that tectonic deformation generally promotes the pore development in brittle TDCs, but the extent of tectonic impact varies greatly among different brittle TDCs. As a result, two stages in brittle TDCs were identified: weak brittle deformation stage (primary coal, cataclastic coal, schistose coal and mortar coal) and strong brittle deformation stage (mortar coal, granulitic coal and flaky coal). In the weak brittle deformation stage, tectonic stress has little impact on coals’ pore structure. The mean pore number increases slowly and the mean pore size decreases slowly. In this stage, the tectonic process mainly promotes the development of 100-200 nm macropores. In the strong brittle deformation stage, tectonic stress has a major impact on coals’ pore structure. The mean pore number increases quickly and the mean pore size decreases quickly. The tectonic process in this stage mainly promotes the development of mesopores of 10-50 nm and macropores of 50-100 nm. The two different tectonic stages demonstrate that the whole brittle TDCs do not evolve linearly with tectonic deformation. The arithmetical average height (Ra) and root-mean-square (Rq) roughness are 3.00-6.05 nm and 3.94-7.62 nm respectively. The weak brittle TDCs’ Ra and Rq fluctuate slightly, while the strong brittle TDCs’ Ra and Rq decrease fast. A mathematical model of the morphology of pores in the coal surface was established based on AFM sectional analysis. The Ra simulation of coal samples based on this model shows that pores of larger diameter are mainly responsible for surface roughness. Ra and Rq of coal samples are controlled mainly by nanopore development during tectonic deformation.
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  • [1]
    李明. 构造煤结构演化及成因机制[D]. 徐州: 中国矿业大学, 2013.

    LI Ming. Structure evolution and deformation mechanism of tectonically deformed coal[D]. Xuzhou: China University of Mining and Technology, 2013.
    [2]
    REN Jiangang,SONG Zhimin,LI Bing,et al. Structure feature and evolution mechanism of pores in different metamorphism and deformation coals[J]. Fuel,2021,283:119292.
    [3]
    朱海涛. 基于AFM的不同变质变形煤的超微结构研究[D]. 焦作: 河南理工大学, 2014.

    ZHU Haitao. Study on the microstructure of different metamorphic deformed coal based on AFM[D]. Jiaozuo: Henan Polytechnic University, 2014.
    [4]
    张瑞刚,方李涛,胡波,等. 朱仙庄矿构造煤结构及其孔隙特征[J]. 煤田地质与勘探,2015,43(4):6−10. ZHANG Ruigang,FANG Litao,HU Bo,et al. Tectonic coal structure and pore characteristics of Zhuxianzhuang mine[J]. Coal Geology & Exploration,2015,43(4):6−10. DOI: 10.3969/j.issn.1001-1986.2015.04.002
    [5]
    张晓辉. 韩城矿区构造煤孔隙结构多尺度下的精细表征[D]. 太原: 太原理工大学, 2014.

    ZHANG Xiaohui. The fine characterization of pore structure of tectonically deformed coals from Hancheng mining area on multiscale[D]. Taiyuan: Taiyuan University of Technology, 2014.
    [6]
    CHENG Yuanping,PAN Zhejun. Reservoir properties of Chinese tectonic coal:A review[J]. Fuel,2020,260:116350.
    [7]
    么玉鹏. 脆性变形系列构造煤物性特征及其结构定量表征[D]. 徐州: 中国矿业大学, 2017.

    YAO Yupeng. Physical properties of brittle deformation series tectonically defromed coal and quantitative characterization of its structure[D]. Xuzhou: China University of Mining and Technology, 2017.
    [8]
    董夔,贾建称,巩泽文,等. 淮北许疃矿构造煤孔隙结构及压敏效应[J]. 煤田地质与勘探,2019,47(2):58−65. DONG Kui,JIA Jiancheng,GONG Zewen,et al. Study on pore structure and pressure–sensitive effect of tectonic coal in Huaibei Xutuan mine[J]. Coal Geology & Exploration,2019,47(2):58−65.
    [9]
    高彬,黄华州,宁娜,等. 构造煤纳米级孔隙特征及其对含气性的影响[J]. 煤田地质与勘探,2018,46(5):182−187. GAO Bin,HUANG Huazhou,NING Na,et al. Pore size characteristics of tectonic coal and its influence on gas bearing properties[J]. Coal Geology & Exploration,2018,46(5):182−187. DOI: 10.3969/j.issn.1001-1986.2018.05.028
    [10]
    PAN Jienan,ZHU Haitao,HOU Quanlin,et al. Macromolecular and pore structures of Chinese tectonically deformed coal studied by atomic force microscopy[J]. Fuel,2015,139:94−101.
    [11]
    JIAO Kun,YAO Suping,ZHANG Ke,et al. The evolution of nanopores and surface roughness in naturally matured coals in South China:An atomic force microscopy and image processing study[J]. Fuel,2018,234:1123−1131.
    [12]
    WANG Shaoqing,LIU Shimin,SUN Yibo,et al. Investigation of coal components of Late Permian different ranks bark coal using AFM and Micro–FTIR[J]. Fuel,2017,187:51−57.
    [13]
    ZHAO Shihu,LI Yong,WANG Yanbin,et al. Quantitative study on coal and shale pore structure and surface roughness based on atomic force microscopy and image processing[J]. Fuel,2019,244:78−90.
    [14]
    LIU Xianfeng,SONG Dazhao,HE Xueqiu,et al. Nanopore structure of deep–burial coals explored by AFM[J]. Fuel,2019,246:9−17.
    [15]
    LI Yong,YANG Jianghao,PAN Zhejun,et al. Nanoscale pore structure and mechanical property analysis of coal:An insight combining AFM and SEM images[J]. Fuel,2020,260:116352.
    [16]
    SONG Yu,JIANG Bo,LI Ming,et al. A review on pore–fractures in tectonically deformed coals[J]. Fuel,2020,278:118248.
    [17]
    宋晓夏,唐跃刚,李伟,等. 中梁山南矿构造煤吸附孔分形特征[J]. 煤炭学报,2013,38(1):134−139. SONG Xiaoxia,TANG Yuegang,LI Wei,et al. Fractal characteristics of adsorption pores of tectonic coal from Zhongliangshan southern coalmine[J]. Journal of China Coal Society,2013,38(1):134−139.
    [18]
    LIU Hewu,JIANG Bo. Stress response of noncovalent bonds in molecular networks of tectonically deformed coals[J]. Fuel,2019,255:115785.
    [19]
    SONG Yu,JIANG Bo,LIU Jiegang. Nanopore structural characteristics and their impact on methane adsorption and diffusion in low to medium tectonically deformed coals:Case study in the Huaibei coal field[J]. Energy & Fuels,2017,31:6711−6723.
    [20]
    琚宜文,姜波,侯泉林,等. 构造煤结构–成因新分类及其地质意义[J]. 煤炭学报,2004,29(5):513−517. JU Yiwen,JIANG Bo,HOU Quanlin,et al. The new structure–genetic classification system in tectonically deformed coals and its geological significance[J]. Journal of China Coal Society,2004,29(5):513−517. DOI: 10.3321/j.issn:0253-9993.2004.05.001
    [21]
    NEČAS D,KLAPETEK P. Gwyddion:An open−source software for SPM data analysis[J]. Central European Journal of Physics,2012,10(1):181−188.
    [22]
    SING K S W,EVERETT D H,HAUL R A W,et al. Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity[J]. Pure and Applied Chemistry,1985,57(4):603−619.
    [23]
    GADELMAWLA E S,KOURA M M,MAKSOUD T M A,et al. Roughness parameters[J]. Journal of Materials Processing Technology,2002,123:133−145.
    [24]
    琚宜文,姜波,侯泉林,等. 煤岩结构纳米级变形与变质变形环境的关系[J]. 科学通报,2005,50(17):1884−1892. JU Yiwen,JIANG Bo,HOU Quanlin,et al. Relationship between nano–scale deformation of coal rock structure and metamorphic deformation environment[J]. Chinese Science Bulletin,2005,50(17):1884−1892. DOI: 10.3321/j.issn:0023-074X.2005.17.016
    [25]
    琚宜文,姜波,侯泉林,等. 华北南部构造煤纳米级孔隙结构演化特征及作用机理[J]. 地质学报,2005,79(2):269−285. JU Yiwen,JIANG Bo,HOU Quanlin,et al. Structual evolution of nano−scale pores of tectonic coals in southern North China and its mechanism[J]. Acta Geologica Sinica,2005,79(2):269−285. DOI: 10.3321/j.issn:0001-5717.2005.02.013
    [26]
    琚宜文,李小诗. 构造煤超微结构研究新进展[J]. 自然科学进展,2009,19(2):131−140. JU Yiwen,LI Xiaoshi. New progress in the study of microstructure of deformed coal[J]. Progress in Natural Science,2009,19(2):131−140. DOI: 10.3321/j.issn:1002-008X.2009.02.002
    [27]
    BRUENING F A,COHEN A D. Measuring surface properties and oxidation of coal macerals using the atomic force microscope[J]. International Journal of Coal Geology,2005,63:195−204.
    [28]
    LIU Jiaxun,JIANG Xiumin,HUANG Xiangyong,et al. Morphological characterization of super fine pulverized coal particle. Part 2. AFM investigation of single coal particle[J]. Fuel,2010,89:3884−3891.
    [29]
    MORGA R. Changes of semifusinite and fusinite surface roughness during heat treatment determined by atomic force microscopy[J]. International Journal of Coal Geology,2011,88:218−226.
    [30]
    WU Dun,LIU Guijian,SUN Ruoyu,et al. Influences of magmatic intrusion on the macromolecular and pore structures of coal:Evidences from Raman spectroscopy and atomic force microscopy[J]. Fuel,2014,119:191−201.
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