| Citation: |
YUAN Anying，YANG Xiaolu，HOU Junling，et al. Comprehensive characterization of pore structure in coal seams with abnormal gas emission in deep close range coal seam clusters[J]. Coal Science and Technology，2024，52（12）：116−126. DOI: 10.12438/cst.2024-0490
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Coal and gas outburst accidents have always been a major problem in coal mine safety production. Pores and fissures in coal are the main places for gas adsorption and migration. It is of great significance to study the structural characteristics of pores and fissures for the prevention and control of gas disasters. Taking the abnormal gas emission coal seam of Xieqiao Coal Mine in Huainan Mining Area as the research object, Compares the areas without accidents and adjacent coal seams conducting experimental studies such as scanning electron microscopy (SEM) and low field nuclear magnetic resonance (NMR) to study the parameters of coal pore and fracture types, pore connectivity, pore size distribution, effective porosity, and permeability, and explores the influence of coal pore structure on gas adsorption and migration. The results show that the internal pore structure of coal body will affect its permeability, and the development of a large number of granular pores in coal body and the serious filling of minerals are not conducive to fluid migration. The T2 spectrum of saturated water coal samples in three regions shows three peaks in nuclear magnetic resonance time, mainly with short relaxation time. However, there are certain differences in the pore size distribution and connectivity of each coal body. The abnormal areas have abnormally developed micropores in the coal body, relatively undeveloped small and medium-sized pores, and poor connectivity between adsorption pores and transition pores, indicating that the differences in gas migration are related to pore size distribution and pore connectivity; The abnormal coal body in the area is conducive to gas adsorption but not conducive to gas diffusion, and the initial velocity of gas release is higher, making it more prone to gas abnormal outburst or outburst accidents when affected by mining; The proportion of micropores in coal is negatively correlated with effective porosity, while the proportion of small and medium-sized pores is positively correlated with effective porosity. The effective porosity is significantly linearly related to coal permeability, indicating that the pore size distribution of coal affects the effective porosity of coal, thereby affecting the permeability of coal; The effective porosity directly affects the permeability of coal seams and is also related to coal quality parameters, which can be used as one of the indicators to evaluate the properties of coal seams to a certain extent .
| [1] |
王恩元,张国锐,张超林,等. 我国煤与瓦斯突出防治理论技术研究进展与展望[J]. 煤炭学报,2022,47(1):297−322.
WANG Enyuan,ZHANG Guorui,ZHANG Chaolin,et al. Research progress and prospect on theory and technology for coal and gas outburst control and protection in China[J]. Journal of China Coal Society,2022,47(1):297−322.
|
| [2] |
谢和平. 深部岩体力学与开采理论研究进展[J]. 煤炭学报,2019,44(5):1283−1305.
XIE Heping. Research review of the state key research development program of China:deep rock mechanics and mining theory[J]. Journal of China Coal Society,2019,44(5):1283−1305.
|
| [3] |
袁亮. 深部采动响应与灾害防控研究进展[J]. 煤炭学报,2021,46(3):716−725.
YUAN Liang. Research progress of mining response and disaster prevention and control in deep coal mines[J]. Journal of China Coal Society,2021,46(3):716−725.
|
| [4] |
张超林,蒲静轩,宋世豪,等. 煤与瓦斯突出两相流运移规律研究进展[J]. 煤炭科学技术,2023,51(8):129−139.
ZHANG Chaolin,PU Jingxuan,SONG Shihao,et al. Research progress on the two-phase flow migration law of coal and gas outburst[J]. Coal Science and Technology,2023,51(8):129−139.
|
| [5] |
翟成,丛钰洲,陈爱坤,等. 中国煤矿瓦斯突出灾害治理的若干思考及展望[J]. 中国矿业大学学报,2023,52(6):1146−1161.
ZHAI Cheng,CONG Yuzhou,CHEN Aikun,et al. Reflection and prospect on the prevention of gas outburst disasters in China’s coal mines[J]. Journal of China University of Mining & Technology,2023,52(6):1146−1161.
|
| [6] |
赵洪宝,秦逢缘,李作泉,等. 煤层纳米孔隙结构对瓦斯运移特性的影响研究[J]. 采矿与安全工程学报,2022,39(6):1256−1264,1271.
ZHAO Hongbao,QIN Fengyuan,LI Zuoquan,et al. The influence of coal seam nano-pore structure on gas migration characteristics[J]. Journal of Mining & Safety Engineering,2022,39(6):1256−1264,1271.
|
| [7] |
张开仲,程远平,王亮,等. 基于煤中瓦斯赋存和运移方式的孔隙网络结构特征表征[J]. 煤炭学报,2022,47(10):3680−3694.
ZHANG Kaizhong,CHENG Yuanping,WANG Liang,et al. Pore network structure characterization based on gas occurrence and migration in coal[J]. Journal of China Coal Society,2022,47(10):3680−3694.
|
| [8] |
王亮,李子威,郑思文,等. 颗粒煤基质尺度计算新方法及应用[J]. 煤炭科学技术,2024,52(2):115−125. doi: 10.12438/cst.2023-0886
WANG Liang,LI Ziwei,ZHENG Siwen,et al. A new method for calculating particle coal matrix scale and its application[J]. Coal Science and Technology,2024,52(2):115−125. doi: 10.12438/cst.2023-0886
|
| [9] |
刘怀谦,王磊,谢广祥,等. 煤体孔隙结构综合表征及全孔径分形特征[J]. 采矿与安全工程学报,2022,39(3):458−469,479.
LIU Huaiqian,WANG Lei,XIE Guangxiang,et al. Comprehensive characterization and full pore size fractal characteristics of coal pore structure[J]. Journal of Mining & Safety Engineering,2022,39(3):458−469,479.
|
| [10] |
MOORE T. Coalbed methane:A review[J]. International Journal of Coal Geology,2012,101:36−81. doi: 10.1016/j.coal.2012.05.011
|
| [11] |
李阳,张玉贵,张浪,等. 基于压汞、低温N2吸附和CO2吸附的构造煤孔隙结构表征[J]. 煤炭学报,2019,44(4):1188−1196.
LI Yang,ZHANG Yugui,ZHANG Lang,et al. Characterization on pore structure of tectonic coals based on the method of mercury intrusion,carbon dioxide adsorption and nitrogen adsorption[J]. Journal of China Coal Society,2019,44(4):1188−1196.
|
| [12] |
程远平,胡彪. 基于煤中甲烷赋存和运移特性的新孔隙分类方法[J]. 煤炭学报,2023,48(1):212−225.
CHENG Yuanping,HU Biao. A new pore classification method based on the methane occurrence and migration characteristics in coal[J]. Journal of China Coal Society,2023,48(1):212−225.
|
| [13] |
杨昌永,常会珍,邵显华,等. 扫描电镜下不同煤体结构煤微孔隙特征研究[J]. 煤炭科学技术,2019,47(12):194−200.
YANG Changyong,CHANG Huizhen,SHAO Xianhua,et al. Study on micro-pore characteristics of structural coal in different coal bodies under scanning electron microscopy[J]. Coal Science and Technology,2019,47(12):194−200.
|
| [14] |
李祥春,李忠备,张良,等. 不同煤阶煤样孔隙结构表征及其对瓦斯解吸扩散的影响[J]. 煤炭学报,2019,44(S1):142−156.
LI Xiangchun,LI Zhongbei,ZHANG Liang,et al. Pore structure characterization of various rank coals and its effect on gas desorption and diffusion[J]. Journal of China Coal Society,2019,44(S1):142−156.
|
| [15] |
蒋静宇,程远平,张硕. 低阶煤孔隙结构定量表征及瓦斯吸附放散特性[J]. 煤炭学报,2021,46(10):3221−3233.
JIANG Jingyu,CHENG Yuanping,ZHANG Shuo. Quantitative characterization of pore structure and gas adsorption and diffusion properties of low-rank coal[J]. Journal of China Coal Society,2021,46(10):3221−3233.
|
| [16] |
杨明,柳磊,刘佳佳,等. 中阶煤孔隙结构的氮吸附−压汞−核磁共振联合表征研究[J]. 煤炭科学技术,2021,49(5):67−74.
YANG Ming,LIU Lei,LIU Jiajia,et al. Study on joint characterization of pore structure of middle-rank coal by nitrogen adsorption-mercury intrusion-NMR[J]. Coal Science and Technology,2021,49(5):67−74.
|
| [17] |
张文政,王经玺. 基于显微CT的不同煤种微观孔隙结构综合表征[J]. 煤炭科学技术,2021,49(S2):85−92.
ZHANG Wenzheng,WANG Jingxi. Characterization of microscopic pore structure of different coal types based on micro CT[J]. Coal Science and Technology,2021,49(S2):85−92.
|
| [18] |
刘纪坤,任棒,王翠霞. 中低阶煤孔隙结构特征及其对瓦斯解吸特性影响[J]. 煤炭科学技术,2022,50(12):153−161.
LIU Jikun,REN Bang,WANG Cuixia. Pore structure characteristics of middle and low rank coals and their influence on gas desorption characteristics[J]. Coal Science and Technology,2022,50(12):153−161.
|
| [19] |
赵健光,王猛,马如英,等. 基于压汞法对黔西青龙矿构造煤孔隙结构特征的研究[J]. 煤炭科学技术,2022,50(10):159−168.
ZHAO Jianguang,WANG Meng,MA Ruying,et al. Study on pore structure characteristics of tectonic coal in Qinglong Coal Mine in Western Guizhou based on mercury injection[J]. Coal Science and Technology,2022,50(10):159−168.
|
| [20] |
孙四清,杨帆,郑玉岐,等. 煤层瓦斯含量测定技术及装备研究进展[J]. 煤炭科学技术,2024,52(4):164−176.
SUN Siqing,YANG Fan,ZHENG Yuqi,et al. Research progress of coal seam gas content determination technology and equipment[J]. Coal Science and Technology,2024,52(4):164−176.
|
| [21] |
程庆迎,黄炳香,李增华. 煤的孔隙和裂隙研究现状[J]. 煤炭工程,2011,43(12):91−93. doi: 10.3969/j.issn.1671-0959.2011.12.035
CHENG Qingying,HUANG Bingxiang,LI Zenghua. Research status of pore and crack in coal[J]. Coal Engineering,2011,43(12):91−93. doi: 10.3969/j.issn.1671-0959.2011.12.035
|
| [22] |
YAO Y B,LIU D M,CHE Y,et al. Petrophysical characterization of coals by low-field nuclear magnetic resonance (NMR)[J]. Fuel,2010,89(7):1371−1380. doi: 10.1016/j.fuel.2009.11.005
|
| [23] |
翟成,孙勇,范宜仁,等. 低场核磁共振技术在煤孔隙结构精准表征中的应用与展望[J]. 煤炭学报,2022,47(2):828−848.
ZHAI Cheng,SUN Yong,FAN Yiren,et al. Application and prospect of low-field nuclear magnetic resonance technology in accurate characterization of coal pore structure[J]. Journal of China Coal Society,2022,47(2):828−848.
|
| [24] |
霍多特. 煤与瓦斯突出[M]. 北京:中国工业出版社,1966.
|
| [25] |
安丰华,贾宏福,刘军. 煤孔隙特征对瓦斯放散初速度影响研究[J]. 煤炭科学技术,2021,49(9):82−87.
AN Fenghua,JIA Hongfu,LIU Jun. Study on influence of coal pore characteristics on initial velocity of gas emission[J]. Coal Science and Technology,2021,49(9):82−87.
|
| [26] |
ZHANG Y R,XU S X,FANG Z F,et al. Permeability of concrete and correlation with microstructure parameters determined by 1H NMR[J]. Advances in Materials Science and Engineering,2020,2020(1):1−11.
|
| [27] |
任会康,王安民,李昌峰,等. 基于核磁共振技术的低阶煤储层孔隙特征研究[J]. 煤炭科学技术,2017,45(4):143−148.
REN Huikang,WANG Anmin,LI Changfeng,et al. Study on porosity characteristics of low-rank coal reservoirs based on nuclear magnetic resonance technology[J]. Coal Science and Technology,2017,45(4):143−148.
|
| [28] |
QIN L,ZHAI C,LIU S M,et al. Changes in the petrophysical properties of coal subjected to liquid nitrogen freeze-thaw–a nuclear magnetic resonance investigation[J]. Fuel,2017,194:102−114. doi: 10.1016/j.fuel.2017.01.005
|
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