复合煤层物性差异性试验研究
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摘要
煤层的物性特征与煤与瓦斯突出、煤层瓦斯含量密切相关,为降低复合煤层的煤与瓦斯突出的危险性、煤层瓦斯含量,分别采用低温液氮吸附试验、压汞试验、甲烷等温吸附/扩散试验对焦作矿区复合煤层中的软硬煤物性差异性进行研究。结果表明:软煤的BJH孔容及BET比表面积均大于硬煤;构造作用可使一部分可见孔或裂隙转化为中大孔,硬煤的孔隙联通性比软煤的孔隙联通性好。软煤中一端开放的细颈瓶型孔占的比例较大,造成软煤的退汞效率低,这是软煤易发生煤与瓦斯突出的重要原因之一;软煤的吸附常数a值稍大于硬煤,而比表面积却有显著差异,孔隙中吸附瓦斯不仅与比表面积有关,还与孔径大小、吸附层数及兰纳-琼斯势能有关;软煤的扩散系数大于硬煤,其衰减得比硬煤快,扩散系数与时间呈现出时变特性;在软硬分层进行现场取心实测煤层瓦斯含量时,应以软分层漏失量最小为基准采取抑制瓦斯漏失的措施,以实现煤层瓦斯含量的准确测定;在软分层进行瓦斯抽采时应适当加长抽采时间、减小钻孔间距,达到软分层消突效果。软硬分层的瓦斯含量与软硬煤的水分、孔隙率相关,孔隙率越大游离瓦斯含量越大,平衡水分抑制煤体瓦斯吸附,平衡水分越大其吸附量越小。如果软分层的瓦斯含量大于硬分层的瓦斯含量,在进行瓦斯抽采效果检验时,软分层是首选检验对象;如果软分层的瓦斯含量不大于硬分层的瓦斯含量,在进行瓦斯抽采效果检验时,软分层和硬分层应同时作为检验对象。
This paper is devoted to quantitatively identify coal structure and study the distribution characteristics of coal structure in Hancheng H3 well group. The drilling coring data and the differences of logging response characteristics of coal seams with different coal structure are analyzed. The method of identifying coal structure with dual parameters of coal structure index( N) and ratio of deep lateral resistivity to micro resistivity R( LLD/MSFL) is established. According to the inversion model,and the logging interpretation of coal structure in 29 wells was completed,and the vertical distribution characteristics of coal structure were clarified. Furthermore,the stochastic modeling method is used to realize the three-dimensional visualization of the spatial distribution characteristics of coal structure using the Petrel2015 three-dimensional geological modeling software. The results show that in No.5 coal seam,N<40 and R<81 are ClassⅠcoal( primary-cataclastic coal),N<42 and 82
This paper is devoted to quantitatively identify coal structure and study the distribution characteristics of coal structure in Hancheng H3 well group. The drilling coring data and the differences of logging response characteristics of coal seams with different coal structure are analyzed. The method of identifying coal structure with dual parameters of coal structure index( N) and ratio of deep lateral resistivity to micro resistivity R( LLD/MSFL) is established. According to the inversion model,and the logging interpretation of coal structure in 29 wells was completed,and the vertical distribution characteristics of coal structure were clarified. Furthermore,the stochastic modeling method is used to realize the three-dimensional visualization of the spatial distribution characteristics of coal structure using the Petrel2015 three-dimensional geological modeling software. The results show that in No.5 coal seam,N<40 and R<81 are ClassⅠcoal( primary-cataclastic coal),N<42 and 82
引文
[1]刘彦伟.煤粒瓦斯放散规律、机理与动力学模型研究[D].焦作:河南理工大学,2011.
[2]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 ultrastructure of tectonic coal[J].Progress in Natural Science,2009,19(2):131-140.
[3] JU Yiwen,JIANG Bo,HOU Quanlin,et al.Structural evolution of nano-scale pores of tectonic coals in southern north China and its mechanism[J].Acta Geologica Sinica,2005,79(2):271-285.
[4]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.
[5]宋晓夏,唐跃刚,李伟,等.基于小角X射线散射构造煤孔隙结构的研究[J].煤炭学报,2014,39(4):719-724.SONG Xiaoxia,TANG Yuegang,LI wei,et al.Pore structure in tectonically deformed coals by small angle X-ray scattering[J].Journal of China Coal Society,2014,39(4):719-724.
[6]薛光武,刘鸿福,要惠芳,等.韩城地区构造煤类型与孔隙特征[J].煤炭学报,2011,36(11):1845-1851.XUE Guangwu,LIU Hongfu,YAO Huifang,et al.The types of tectonic coals and pore characters in Hancheng[J]. Journal of China Coal Society,2011,36(11):1845-1851.
[7]王向浩,王延斌,高莎莎,等.构造煤与原生结构煤的孔隙结构及吸附性差异[J].高校地质学报,2012,18(3):528-532.WANG Xianghao,WANG Yanbin,GAO Shasha,et al. Differences in pore structures and absorptivity between tectonically deformed and undeformed coals[J]. Geological Journal of China Universities,2012,18(3):528-532.
[8]张子敏.瓦斯地质学[M].徐州:中国矿业大学出版社,2009,119-165.
[9]郑万成,邓小松,李一波.混合煤样中软分层对煤与瓦斯突出的影响[J].中国安全生产科学技术,2012,8(12):5-10.ZHENGWancheng,DENG Xiaosong,LI Yibo.Effect of soft layer in the mixed coal on coal and gas outburst[J].Journal of Safety Science and Technology,2012,8(12):5-10.
[10]肖鹏,赵鹏翔,林海飞,等.混合煤样中软分层对煤与瓦斯突出的影响[J].西安科技大学学报,2013,33(1):18-22.XIAOPeng,ZHAO Pengxiang,LIN Haifei,et al.Effect of soft layer in the mixed coal on coal and gas outburst[J]. Journal of Xi’an University of Science and Technology,2013,33(1):18-22.
[11]李阳,张玉贵,张浪.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 the mercury intrusion,carbon dioxide adsorption and nitrogen[J].Journal of China Coal Society,2019,44(4):1188-1196.
[12]霍多特B B.煤与瓦斯突出[M].北京:煤炭工业出版社,1966,27-28.
[13] Carlos A Leóny León. New perspectives in mercury porosimetry[J]. Advances in Colloid and Interface Science,1998,76-77(1):341-372.
[14] HUANG Zhilong,LIU Guoheng,LI Tianjun,et al.Characterization and control of mesopore structural heterogeneity for low thermal maturity shale:a case study of yanchang formation shale,Ordos Basin[J].Energy&Fuels,2017,31(11):11569-11586.
[15]段正鹏,李志强,陈向军,等.多尺度煤粒与瓦斯多尺度动扩散系数模型特征参数关系研究[J].中国安全生产科学技术,2018,14(6):97-102.DUAN Zhengpeng,LI Zhiqiang,CHEN Xiangjun,et al.Study on relationship between multi-scale coal particles and characteristic parameters of gas multi-scale dynamic diffusion coefficient model[J].Journal of Safety Science and Technology,2018,14(6):97-102.
[16]李小军,王兆丰,祁晨君.干冰为冷源的含瓦斯型煤低温冷冻试验[J].煤炭学报,2017,42(S1):160-165.LIXiaojun,WANG Zhaofeng,QI Chenjun.Freezing experiments on moulded coal with methane using dry ice as cold source[J].Journal of China Coal Society,2017,42(S1):160-165.
[17] JoubertJames I,Grein Clifford T,Bienstock Daniel. Sorption of methane in moist coal[J].Fuel,1973,52(3):181-185.
[18] JoubertJames I,Grein Clifford T,Bienstock Daniel.Effect of moisture on the methane capacity of American coals[J]. Fuel,1974,53(3):186-191.
[19] Clarkson CR,Bustin RM. The effect of pore structure and gas pressure upon the transport properties of coal:a laboratory and modeling study.2. Adsorption rate modeling[J]. Fuel,1999,78(11):1345-1362.
[20] Levy John H,Day Stuart J,Killingley John S.Methane capacities of Bowen Basin coals related to coal properties[J].Fuel,1997,76(9):813-819.
[2]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 ultrastructure of tectonic coal[J].Progress in Natural Science,2009,19(2):131-140.
[3] JU Yiwen,JIANG Bo,HOU Quanlin,et al.Structural evolution of nano-scale pores of tectonic coals in southern north China and its mechanism[J].Acta Geologica Sinica,2005,79(2):271-285.
[4]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.
[5]宋晓夏,唐跃刚,李伟,等.基于小角X射线散射构造煤孔隙结构的研究[J].煤炭学报,2014,39(4):719-724.SONG Xiaoxia,TANG Yuegang,LI wei,et al.Pore structure in tectonically deformed coals by small angle X-ray scattering[J].Journal of China Coal Society,2014,39(4):719-724.
[6]薛光武,刘鸿福,要惠芳,等.韩城地区构造煤类型与孔隙特征[J].煤炭学报,2011,36(11):1845-1851.XUE Guangwu,LIU Hongfu,YAO Huifang,et al.The types of tectonic coals and pore characters in Hancheng[J]. Journal of China Coal Society,2011,36(11):1845-1851.
[7]王向浩,王延斌,高莎莎,等.构造煤与原生结构煤的孔隙结构及吸附性差异[J].高校地质学报,2012,18(3):528-532.WANG Xianghao,WANG Yanbin,GAO Shasha,et al. Differences in pore structures and absorptivity between tectonically deformed and undeformed coals[J]. Geological Journal of China Universities,2012,18(3):528-532.
[8]张子敏.瓦斯地质学[M].徐州:中国矿业大学出版社,2009,119-165.
[9]郑万成,邓小松,李一波.混合煤样中软分层对煤与瓦斯突出的影响[J].中国安全生产科学技术,2012,8(12):5-10.ZHENGWancheng,DENG Xiaosong,LI Yibo.Effect of soft layer in the mixed coal on coal and gas outburst[J].Journal of Safety Science and Technology,2012,8(12):5-10.
[10]肖鹏,赵鹏翔,林海飞,等.混合煤样中软分层对煤与瓦斯突出的影响[J].西安科技大学学报,2013,33(1):18-22.XIAOPeng,ZHAO Pengxiang,LIN Haifei,et al.Effect of soft layer in the mixed coal on coal and gas outburst[J]. Journal of Xi’an University of Science and Technology,2013,33(1):18-22.
[11]李阳,张玉贵,张浪.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 the mercury intrusion,carbon dioxide adsorption and nitrogen[J].Journal of China Coal Society,2019,44(4):1188-1196.
[12]霍多特B B.煤与瓦斯突出[M].北京:煤炭工业出版社,1966,27-28.
[13] Carlos A Leóny León. New perspectives in mercury porosimetry[J]. Advances in Colloid and Interface Science,1998,76-77(1):341-372.
[14] HUANG Zhilong,LIU Guoheng,LI Tianjun,et al.Characterization and control of mesopore structural heterogeneity for low thermal maturity shale:a case study of yanchang formation shale,Ordos Basin[J].Energy&Fuels,2017,31(11):11569-11586.
[15]段正鹏,李志强,陈向军,等.多尺度煤粒与瓦斯多尺度动扩散系数模型特征参数关系研究[J].中国安全生产科学技术,2018,14(6):97-102.DUAN Zhengpeng,LI Zhiqiang,CHEN Xiangjun,et al.Study on relationship between multi-scale coal particles and characteristic parameters of gas multi-scale dynamic diffusion coefficient model[J].Journal of Safety Science and Technology,2018,14(6):97-102.
[16]李小军,王兆丰,祁晨君.干冰为冷源的含瓦斯型煤低温冷冻试验[J].煤炭学报,2017,42(S1):160-165.LIXiaojun,WANG Zhaofeng,QI Chenjun.Freezing experiments on moulded coal with methane using dry ice as cold source[J].Journal of China Coal Society,2017,42(S1):160-165.
[17] JoubertJames I,Grein Clifford T,Bienstock Daniel. Sorption of methane in moist coal[J].Fuel,1973,52(3):181-185.
[18] JoubertJames I,Grein Clifford T,Bienstock Daniel.Effect of moisture on the methane capacity of American coals[J]. Fuel,1974,53(3):186-191.
[19] Clarkson CR,Bustin RM. The effect of pore structure and gas pressure upon the transport properties of coal:a laboratory and modeling study.2. Adsorption rate modeling[J]. Fuel,1999,78(11):1345-1362.
[20] Levy John H,Day Stuart J,Killingley John S.Methane capacities of Bowen Basin coals related to coal properties[J].Fuel,1997,76(9):813-819.