阜康矿区气煤孔隙结构特征研究
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摘要
为了研究阜康矿区瓦斯的储存情况与抽采可行性,采用压汞法和低温液氮吸附法对比分析不同条件下煤的孔隙结构参数及其分布特征。分析结果表明,煤样中大孔和微孔占比较大,孔径较大的孔隙由两端开口的圆筒形孔及四边开放的平行板孔组成,开放性好,有利于瓦斯抽采利用;气煤煤样总孔容大于高变质程度煤样,孔隙结构有利于瓦斯赋存和放散;气煤孔隙的比表面积虽然小于高变质程度煤样,但其孔隙结构中小孔的比表面积占比较大,小孔为瓦斯吸附提供了较大空间,所以阜康矿区气煤也具有一定的瓦斯吸附能力,煤层瓦斯可以抽采利用。
In order to study gas storage and extraction feasibility in Fukang mining area,mercury intrusion method and liquid nitrogen adsorption method in low temperature were used to compare and analyze pore structure parameters and distribution characteristics of coal under different conditions.The analysis results show that large pores and micropores in coal samples account for a large proportion,the pores with large pore diameter are composed of cylindrical pores with open ends and parallel plate holes with four open sides,which has good openness and is beneficial to gas drainage and utilization;The total pore volume of gas coal samples is larger than that of high metamorphism coal samples,pore structure is conducive to the occurrence and release of gas;The specific surface area of gas coal pores is smaller than that of high metamorphic coal samples,but the specific surface area of small pores account for a large proportion in the pore structure,and small holes can provide large space for gas adsorption,so the gas coal in Fukang mining area also has certain gas adsorption capacity,coal seam gas can be extracted and utilized.
In order to study gas storage and extraction feasibility in Fukang mining area,mercury intrusion method and liquid nitrogen adsorption method in low temperature were used to compare and analyze pore structure parameters and distribution characteristics of coal under different conditions.The analysis results show that large pores and micropores in coal samples account for a large proportion,the pores with large pore diameter are composed of cylindrical pores with open ends and parallel plate holes with four open sides,which has good openness and is beneficial to gas drainage and utilization;The total pore volume of gas coal samples is larger than that of high metamorphism coal samples,pore structure is conducive to the occurrence and release of gas;The specific surface area of gas coal pores is smaller than that of high metamorphic coal samples,but the specific surface area of small pores account for a large proportion in the pore structure,and small holes can provide large space for gas adsorption,so the gas coal in Fukang mining area also has certain gas adsorption capacity,coal seam gas can be extracted and utilized.
引文
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[14]王文峰,徐磊,傅雪海.应用分形理论研究煤孔隙结构[J].中国煤田地质,2002,14(2):26-27.WANG Wenfeng,XU Lei,FU Xuehai.Study on pore texture of coal with fractal theory[J].Coal Geology of China,2002,14(2):26-27.
[2]孟宪明.煤孔隙结构和煤对气体吸附特性研究[D].青岛:山东科技大学,2007.
[3]刘爱华,傅雪海,梁文庆,等.不同煤阶煤孔隙分布特征及其对煤层气开发的影响[J].煤炭科学技术,2013,41(4):104-108.LIU Aihua,FU Xuehai,LIANG Wenqing,et al.Pore distribution features of different rank coal and influences to coal bed methane development[J].Coal Science and Technology,2013,41(4):104-108.
[4]王海龙,刘鸿福,李伟,等.基于压汞技术的构造煤孔隙结构多重分形表征[J].煤矿安全,2016,47(1):33-37.WANG Hailong,LIU Hongfu,LI Wei,et al.Multifractal characterization of tectonically deformed coal pore structure based on mercury injection technology[J].Safety in Coal Mines,2016,47(1):33-37.
[5]顾熠凡,王兆丰,戚灵灵.基于压汞法的软、硬煤孔隙结构差异性研究[J].煤炭科学技术,2016,44(4):64-67.GU Yifan,WANG Zhaofeng,QI Lingling.Study on porous structure difference of soft coal and hard coal based on mercury intrusion method[J].Coal Science and Technology,2016,44(4):64-67.
[6]杨光,秦勇,吴财芳,等.新疆和什托洛盖盆地西山窑组低阶煤孔隙结构特征[J].煤炭科学技术,2017,45(4):123-130.YANG Guang,QIN Yong,WU Caifang,et al.Pore structure features of Xishanyao Formation low rank coal in Hoxtolgay Basin of Xinjiang[J].Coal Science and Technology,2017,45(4):123-130.
[7]王林,蒲春玲.阜康市煤层气开发利用问题研究[J].企业导报,2014(22):68-69.
[8]王翠霞.阜康矿区气煤孔隙结构特征及其煤粒瓦斯放散规律研究[D].西安:西安科技大学,2016.
[9]帕提古丽·斯地克.准格尔盆地阜康矿区瓦斯地质规律研究[D].乌鲁木齐:新疆大学,2012.
[10]谢武仁,杨威,杨光,等.川中地区上三叠统须家河组砂岩储层孔隙结构特征[J].天然气地球科学,2010,21(3):435-440.XIE Wuren,YANG Wei,YANG Guang,et al.Pore structure features of sandstone reservoirs in the upper Triassic Xujiahe Formation in the central part of Sichuan Basin[J].Natural Gas Geoscience,2010,21(3):435-440.
[11]赵迪斐,郭英海,毛潇潇,等.基于压汞、氮气吸附与FE-SEM的无烟煤微纳米孔特征[J].煤炭学报,2017,42(6):1517-1526.ZHAO Difei,GUO Yinghai,MAO Xiaoxiao,et al.Characteristics of macro-nanopores in anthracite coal based on mercury injection,nitrogen adsorption and FE-SEM[J].Journal of China Coal Society,2017,42(6):1517-1526.
[12]王翠霞,李树刚.低阶煤孔隙结构特征及其对瓦斯吸附的影响[J].中国安全科学学报,2015,25(10):133-138.WANG Cuixia, LI Shugang. Pore structure characteristics of low rank coal and their influence on gas adsorption[J].China Safety Science Journal,2015,25(10):133-138.
[13]陈萍,唐修义.低温氮吸附法与煤中微孔隙特征的研究[J].煤炭学报,2001,26(5):552-556.CHEN Ping,TANG Xiuyi.The research on the adsorption of nitrogen in low temperature and micropore properties in coal[J].Journal of China Coal Society,2001,26(5):552-556.
[14]王文峰,徐磊,傅雪海.应用分形理论研究煤孔隙结构[J].中国煤田地质,2002,14(2):26-27.WANG Wenfeng,XU Lei,FU Xuehai.Study on pore texture of coal with fractal theory[J].Coal Geology of China,2002,14(2):26-27.