岩浆侵入对煤吸附瓦斯特性的影响分析
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摘要
为了研究岩浆侵入对煤吸附瓦斯特性影响,以卧龙湖井田10煤11个煤样为研究对象,采用工业分析、等温吸附实验、液氮吸附法测BET比表面积和CO2吸附法测微孔等方法,对比分析了多元物性参数和煤样与火成岩距离的关系。结果表明:岩浆热演化范围为60 m左右。靠近岩浆岩,镜质组反射率Rm由2.74%增至5.03%,挥发分Vdaf由16.04%减至6.85%,煤的变质程度提高。吸附常数a有先增加后减小的趋势,8#煤样(热演化区)a=59.02 m3/t,为最大值。岩浆覆盖区1#煤样a=13.53 m3/t,为最小值。吸附常数a、BET比表面积和微孔孔容分布曲线相关性较好,从数值大小来看,热演化区高于正常区,正常区高于岩浆覆盖区。岩浆接触变质作用,降低了煤吸附瓦斯能力。岩浆侵入煤层使热演化区煤的微孔较发育,比表面积变大,瓦斯吸附位增多,煤的吸附瓦斯能力增强。
In this paper,to study the effect of igneous intrusion on adsorption characteristics of coal to gas,taking 11 samples of No.10 coal seam in Wolonghu coalfield as research object,we compares and analyzes the relationship between the multivariate physical properties of coals and the distances from coal samples to igneous rocks,by synthetically using the methods of industrial analysis,CH4 isothermal adsorption experiments,BET surface area calculated by liquid nitrogen adsorption method,and micro-pores measured by CO2 adsorption method.The results show that the thermal evolution area of magmatic is about 60 m.When approaching the igneous rocks,the vitrinite reflectance(Rm) increases from 2.74% to 5.03%,the volatile matter decreases from 16.04% to 6.85%,and the metamorphic grade of coal increases.Meanwhile,the adsorption constant (a) increases first and then decreases,while the maximal adsorption constant(No.8 coal sample in thermal evolution area) is 59.02 m3/t,and the minimal value(No.1 sample in magmatic covering area) is 13.53 m3/t.In addition,there is good relativity among the distribution curves of adsorption constant,BET surface area,and micro-pore volume.Furthermore,the numerical values in thermal evolution area are higher than that in normal area,while the values in normal area are higher than that in magmatic covering area.Moreover,the adsorption ability of coal to gas is reduced because of the contact metamorphism of magmatic,however,duo to the igneous intrusion,the micro-pores of coal samples in thermal evolution area are more development,BET surface area is more larger,gas adsorption positions increase,and the adsorption ability of coal to gas is enhanced.
In this paper,to study the effect of igneous intrusion on adsorption characteristics of coal to gas,taking 11 samples of No.10 coal seam in Wolonghu coalfield as research object,we compares and analyzes the relationship between the multivariate physical properties of coals and the distances from coal samples to igneous rocks,by synthetically using the methods of industrial analysis,CH4 isothermal adsorption experiments,BET surface area calculated by liquid nitrogen adsorption method,and micro-pores measured by CO2 adsorption method.The results show that the thermal evolution area of magmatic is about 60 m.When approaching the igneous rocks,the vitrinite reflectance(Rm) increases from 2.74% to 5.03%,the volatile matter decreases from 16.04% to 6.85%,and the metamorphic grade of coal increases.Meanwhile,the adsorption constant (a) increases first and then decreases,while the maximal adsorption constant(No.8 coal sample in thermal evolution area) is 59.02 m3/t,and the minimal value(No.1 sample in magmatic covering area) is 13.53 m3/t.In addition,there is good relativity among the distribution curves of adsorption constant,BET surface area,and micro-pore volume.Furthermore,the numerical values in thermal evolution area are higher than that in normal area,while the values in normal area are higher than that in magmatic covering area.Moreover,the adsorption ability of coal to gas is reduced because of the contact metamorphism of magmatic,however,duo to the igneous intrusion,the micro-pores of coal samples in thermal evolution area are more development,BET surface area is more larger,gas adsorption positions increase,and the adsorption ability of coal to gas is enhanced.
引文
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[13]裴印昌,龚邦军,杨志.大兴井田火成岩活动与瓦斯突出的关系[J].煤炭技术,2007,26(5):71-73.PI Yin-chang,GONG Bang-jun,YANG Zhi.Relationof igneous rock move and gas outburst in Daxing coalfield[J].Coal Science and Technology,2007,26(5):71-73.
[14]BEAMISH B B,CROSDALE P J.Instantaneousoutbursts in underground coal mines:an overview andassociation with coal type[J].International Journal ofCoal Geology,1998,35(1-4):27-55.
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[16]LI Wei,CHENG Yuan-ping,WANG Lei,et al.Theorigin and formation of CO2 gas pools in the coal seamof the Yaojie coalfield in China[J].International Journalof Coal Geology,2011,85(2):227-236.
[17]张文永,徐胜平,蔡学斌.卧龙湖煤矿岩浆侵入规律及其对煤层、煤质、瓦斯的影响[J].安徽地质,2005,15(1):25-28.ZHANG Wen-yong,XU Sheng-ping,CAI Xue-bing.Magmatic intrusion of the Wolonghu Mine and its effecton coal seams,coal quality,methane[J].Geology ofAnhui,2005,15(1):25-28.
[18]韩树棻.两淮地区成煤地质条件及成煤预测[M].北京:地质出版社,1990.
[19]JIANG Jing-yu,CHENG Yuan-ping,WANG Lei,et al.Petrographic and geochemical effects of sill intrusionson coal and their implications for gas outbursts in theWolonghu mine,Huaibei coalfield,China[J].InternationalJournal of Coal Geology,2011,88(1):55-66.
[2]STEWART A,MASSEY M,PADGETT P,et al.Influenceof a basic intrusion on the vitrinite reflectance andchemistry of the Springfield(No.5)coal,Harrisburg,Illinois[J].International Journal of Coal Geology,2005,63(1/2):58-67.
[3]GOLAB A,CARR P,PALAMARA D.Influence oflocalised igneous activity on cleat dawsonite formation inLate Permian coal measures,Upper Hunter Valley,Australia[J].International Journal of Coal Geology,2006,66(4):296-304.
[4]MASTALERZ M,DROBNIAK A,SCHIMMELMANNA.Changes in optical properties,chemistry,and microporeand mesopore characteristics of bituminous coal at thecontact with dikes in the Illinois Basin[J].InternationalJournal of Coal Geology,2009,77(3/4),310-319.
[5]GURBA L W,WEBER C R.Effects of igneous intrusionson coalbed methane potential,Gunnedah Basin,Australia[J].International Journal of Coal Geology,2001,46(2-4):113-131.
[6]DAI S F,REN D Y.Effects of magmatic intrusion onmineralogy and geochemistry of coals from the Fengfeng-Handan coalfield,Hebei,China[J].Energy&Fuels,2007,21(3):1663-1673.
[7]RIMMER S M,YOKSOULIAN L E,HOWER J C.Anatomy of an intruded coal,I:Effect of contactmetamorphism on whole-coal geochemistry,Springfield(No.5)(Pennsylvanian)coal,Illinois Basin[J].InternationalJournal of Coal Geology,2009,79(3):74-82.
[8]徐永忠,崔若飞,潘冬明,等.煤田采区火成岩分布地震反演技术的应用研究[J].中国矿业大学学报,2006,35(2):265-268.XU Yong-zhong,CUI Ruo-fei,PAN Dong-ming,et al.Application of seismic inversion based on model forigneous distributing in coalfields[J].Journal of ChinaUniversity of Mining&Technology,2006,35(2):265-268.
[9]刘金华,杨少春,陈宁宁,等.火成岩油气储层中构造裂缝的微构造曲率预测法[J].中国矿业大学学报,2009,38(6):815-819.LIU Jin-hua,YANG Shao-chun,CHEN Ning-ning,et al.Forecasting method of tectoclase in the igneous reservoirsusing a curvatur e of the microtectonics[J].Journal ofChina University of Mining&Technology,2009,38(6):815-819.
[10]刘继认,王启明,冯军.安林煤矿煤与瓦斯突出区域危险性分布的探讨[J].焦作工学院学报,2004,23(6):423-426.LIU Ji-ren,WANG Qi-ming,FENG Jun.Study of thedistribution of coal and gas outburst risk in Anlin CoalMine[J].Journal of Jiaozuo Institute of Technology,2004,23(6):423-426.
[11]刘福胜,徐培武,郑荣华,等.邯邢煤田岩浆侵入及对煤层煤质的影响[J].中国煤田地质,2007,15(9):22-24.LIU Fu-sheng,XU Pei-wu,ZHENG Rong-hua,et al.Magmatic intrusion and its impact to coal seam and soalquality in Hanxing coalfield[J].Coal Geology of China,2007,15(9):22-24.
[12]WANG Liang,CHENG Yuan-ping,LI Feng-rong,etal.Fracture evolution and pressure relief gas drainagefrom distant protected coal seams under an extremelythick key stratum[J].Mining Science&Technology,2008,18(2):182-186.
[13]裴印昌,龚邦军,杨志.大兴井田火成岩活动与瓦斯突出的关系[J].煤炭技术,2007,26(5):71-73.PI Yin-chang,GONG Bang-jun,YANG Zhi.Relationof igneous rock move and gas outburst in Daxing coalfield[J].Coal Science and Technology,2007,26(5):71-73.
[14]BEAMISH B B,CROSDALE P J.Instantaneousoutbursts in underground coal mines:an overview andassociation with coal type[J].International Journal ofCoal Geology,1998,35(1-4):27-55.
[15]SAGHAFI A,PINETOWN K L,GROBLER P G,etal.CO2storage potential of South African coals and gasentrapment enhancement due to igneous intrusions[J].International Journal of Coal Geology,2008,73(1):74-87.
[16]LI Wei,CHENG Yuan-ping,WANG Lei,et al.Theorigin and formation of CO2 gas pools in the coal seamof the Yaojie coalfield in China[J].International Journalof Coal Geology,2011,85(2):227-236.
[17]张文永,徐胜平,蔡学斌.卧龙湖煤矿岩浆侵入规律及其对煤层、煤质、瓦斯的影响[J].安徽地质,2005,15(1):25-28.ZHANG Wen-yong,XU Sheng-ping,CAI Xue-bing.Magmatic intrusion of the Wolonghu Mine and its effecton coal seams,coal quality,methane[J].Geology ofAnhui,2005,15(1):25-28.
[18]韩树棻.两淮地区成煤地质条件及成煤预测[M].北京:地质出版社,1990.
[19]JIANG Jing-yu,CHENG Yuan-ping,WANG Lei,et al.Petrographic and geochemical effects of sill intrusionson coal and their implications for gas outbursts in theWolonghu mine,Huaibei coalfield,China[J].InternationalJournal of Coal Geology,2011,88(1):55-66.
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