基于吸附势理论的深部煤储层吸附气量研究
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摘要
为了揭示深部煤储层煤吸附特性,量化表征煤储层吸附气量,以鄂尔多斯盆地东缘石炭—二叠系煤为研究对象,通过高温高压条件下煤的等温吸附实验研究,从煤级、温度及压力的角度解读高温高压条件下煤吸附特征。基于吸附势理论,建立了不同煤级煤的吸附特征曲线及吸附气量预测模型。应用预测模型对临兴地区石炭系8+9号煤层吸附气量进行了计算,结果表明:深部煤储层吸附气量受煤级、压力、温度的综合控制,煤级在0.77%~2.18%,即气煤—贫煤阶段,煤级和压力对煤吸附能力显示正效应、温度起负效应,且随着压力增大温度的负效应更为显著。不同煤级对应的煤吸附甲烷特征曲线不同,煤级越高则吸附势随吸附空间增大而减小的速度越缓慢。计算的绝对吸附量为19.6~31.1 cm~3/g,含气饱和度为37.8%~78.8%。
In order to reveal the deep coal reservoir adsorption characteristics of coal and the quantitative characterization on the amount of adsorbed gas of coalbed methane,this paper studied the coal samples of carboniferous-permian in eastern Ordos Basin and analyzed the methane isothermal adsorption experiments of high temperatures and pressures of coal samples.An interpretation of the adsorption characteristics was made under high temperatures and pressures from the geological factors including coal rank,temperature and pressure. The curves of coal adsorption characteristic and the prediction model of amount of adsorbed gas with different coal ranks were established based on the adsorption potential theory.Meanwhile,a case study on the amount of adsorbed gas of the No.8+9 coal seam in Linxing area was analyzed based on this model.The results show that the adsorption characteristics of deep coal reservoir are comprehensively influenced by temperature,pressure and coal rank.When the coal rank is between 0.77% and 2.18%,which is from gas coal to poor coal,the coal rank and pressure show a positive effect on adsorption ability,but temperature has a negative effect. In addition,the negative effect is more significant with the pressure increases. Different coal ranks have different curves of coal adsorption characteristic.The higher of coal rank,the slower of rate at which the adsorption potential decreases as the adsorption space increases. The calculation of the amount of absolute adsorbed is between 19.6 cm~3/g and 31.1 cm~3/g,and the gas saturation is between 37.8% and 78.8% in the study area.
In order to reveal the deep coal reservoir adsorption characteristics of coal and the quantitative characterization on the amount of adsorbed gas of coalbed methane,this paper studied the coal samples of carboniferous-permian in eastern Ordos Basin and analyzed the methane isothermal adsorption experiments of high temperatures and pressures of coal samples.An interpretation of the adsorption characteristics was made under high temperatures and pressures from the geological factors including coal rank,temperature and pressure. The curves of coal adsorption characteristic and the prediction model of amount of adsorbed gas with different coal ranks were established based on the adsorption potential theory.Meanwhile,a case study on the amount of adsorbed gas of the No.8+9 coal seam in Linxing area was analyzed based on this model.The results show that the adsorption characteristics of deep coal reservoir are comprehensively influenced by temperature,pressure and coal rank.When the coal rank is between 0.77% and 2.18%,which is from gas coal to poor coal,the coal rank and pressure show a positive effect on adsorption ability,but temperature has a negative effect. In addition,the negative effect is more significant with the pressure increases. Different coal ranks have different curves of coal adsorption characteristic.The higher of coal rank,the slower of rate at which the adsorption potential decreases as the adsorption space increases. The calculation of the amount of absolute adsorbed is between 19.6 cm~3/g and 31.1 cm~3/g,and the gas saturation is between 37.8% and 78.8% in the study area.
引文
[1]秦勇,申建.论深部煤层气基本地质问题[J].石油学报,2016,37(1):125-136.QIN Yong,SHEN Jian.On the fundamental issues of deep coalbed methane geology[J].Acta Petrolei Sinica,2016,37(1):125-136.
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[5]秦勇,申建,王宝文,等.深部煤层气成藏效应及其耦合关系[J].石油学报,2012,33(1):48-54.QIN Yong,SHEN Jian,WANG Baowen,et al.Accumulation effects and coupling relationship of deep coalbed methane[J].Acta Petrolei Sinica,2012,33(1):48-54.
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[7]郇璇,张小兵,韦欢文.基于不同类型煤吸附甲烷的吸附势重要参数探讨[J].煤炭学报,2015,40(8):1859-1864.HUAN Xuan,ZHANG Xiaobing,WEI Huanwen.Research on parameters of adsorption potential via methane adsorption of different types of coal[J].Journal of China Coal Society,2015,40(8):1859-1864.
[8]姜伟,吴财芳,姜玮,等.吸附势理论在煤层气吸附解吸研究中的应用[J].煤炭科学技术,2011,39(5):102-104.JIANG Wei,WU Caifang,JIANG Wei,et al.Application of adsorption potential theory to study on adsorption-desorption of coalbed methane[J].Coal Science and Technology,2011,39(5):102-104.
[9]李明,顾安忠,鲁雪生,等.吸附势理论在甲烷临界温度以上吸附中的应用[J].天然气化工,2003,28(5):28-31.LI Ming,GU Anzhong,LU Xuesheng,et al.Study on methane adsorption above cirtical temperature by adsorption potential theory[J].Natural Gas Chemical Industry,2003,28(5):28-31.
[10]苏现波,林萌,林晓英,等.吸附势理论在煤层甲烷吸附中的应用[J].中国煤层气,2006(2):28-30.SU Xianbo,LIN Meng,LIN Xiaoying,et al.Study of methane adsorption on coal with adsorption potential theory[J].China Coalbed Methane,2006(2):28-30.
[11]钟玲文,郑玉柱,员争荣,等.煤在温度和压力综合影响下的吸附性能及气含量预测[J].煤炭学报,2002,27(6):581-585.ZHONG Lingwen,ZHENG Yuzhu,YUN Zhengrong,et al.The adsorption capability of coal and pressure and predicted under integrated influence of temperature of content quantity of coal bed gas[J].Coal Science and Technology,2002,27(6):581-585.
[12]高然超.基于吸附势理论的构造煤甲烷吸附/解吸规律研究[D].焦作:河南理工大学,2012:13-26.GAO Ranchao.The adsorption/desorption of methane on tectonic coal based on adsorption potential theory[D].Jiaozuo:Henan Polytechnic University,2012:13-26.
[13]AMANKWAH K A G,SCHWARZ J A A.Modified approach for estimating pseudo-vapor pressures in the application of the dubininastakhov equation[J].Carbon,1995,33(9):1313-1319.
[14]OZAWA S,KUSUMI S,OGINO Y J.Physical adsorption of gases at high pressure(IV):An improvement of the Dubinin-Astakhov adsorption equation[J].Colloid&Interface Science,1976,56:83-91.
[15]赵丽娟,秦勇,WANG Geoff,等.高温高压条件下深部煤层气吸附行为[J].高校地质学报,2013,19(4):648-654.ZHAO Liguan,QIN Yong,WANG Geoff,et al.Adsorption behavior of deep coalbed methane under high temperatures and pressures[J].Geological Journal of China Universities,2013,19(4):648-654.
[16]秦勇.中国煤层气成藏作用研究进展与述评[J].高校地质学报,2012,18(3):1-6.QIN Yong.Advances and reviews on coalbed methane reservoir formation in China[J].Geological Journal of China Universities,2012,18(3):1-6.
[17]PRIBYLOV A A,SERPINSKY V V,KALASHNILOV S M.Adsorption of gases by microporous aapascals[J].Zeolites,1991:11:846-849.
[18]SINGH ALOK K.Petrographic characterization and evolution of the Karharbari coals,Talcher Coalfield,Orissa,India[J].International Journal of Coal Science&Technology,2016,3(2):133-147.
[19]秦勇,申建,沈玉林.叠置含气系统共采兼容性——煤系“三气”及深部煤层气开采中的共性地质问题[J].煤炭学报,2016,41(1):14-23.QIN Yong,SHEN Jian,SHEN Yulin.Joint mining compatibility of superposed gas-bearing systems:A general geological problem for extraction of three natural gases and deep CBM in coal series[J].Journal of China Coal Society,2016,41(1):14-23.
[20]张松航,唐书恒,万毅,等.晋城无烟煤煤中CH4和CO2运移规律研究[J].中国矿业大学学报,2012,41(5):770-775.ZHANG Songhang,TANG Shuheng,WAN Yi,et al.The migration of CH4and CO2in Jincheng anthracite coal[J].Journal of China University of Mining and Technology,2012,41(5):770-775.
[21]傅宁,杨树春,贺清,等.鄂尔多斯盆地东缘临兴-神府区块致密砂岩气高效成藏条件[J].石油学报,2016,37(S1):111-120.FU Ning,YANG Shuchun,HE Qing,et al.High-efficiency reservoir formation conditions of tight sandstone gas in Linxing-Shenfu blocks on the east margin of Ordos Basin[J].Acta Petrolei Sinica,2016,37(S1):111-120.
[22]陈家良,邵震杰,秦勇.能源地质学[M].徐州:中国矿业大学出版社,2004:94-95.
[23]苏现波,陈润,林晓英,等.吸附势理论在煤层气吸附/解吸中的应用[J].地质学报,2008,82(10):1382-1389.SU Xianbo,CHEN Run,LIN Xiaoying,et al.Application of adsorption potential theory in the fractionation of coalbed gas during the process of adsorption/desorption[J].Acta Geologica Sinica,2008,82(10):1382-1389.
[24]顾娇杨,张兵,郭明强.临兴区块深部煤层气富集规律与勘探开发前景[J].煤炭学报,2016,41(1):72-79.GU Jiaoyang,ZHANG Bing,GUO Mingqiang.Deepcoalbed methane enrichment rules and its exploration and development prospect in Linxing block[J].Journal of China Coal Society,2016,41(1):72-79.
[25]余学海,孙平,张军营,等.神府煤矿物组合特性及微量元素分布特性定量研究[J].煤炭学报,2015,40(11):2683-2689.YU Xuehai,SUN Ping,ZHANG Junying,et al.Quantitative investigations on mineral matter and distributions of trace elements in Shengfucoal[J].Journal of China Coal Society,2015,40(11):2683-2689.
[26]李勇,汤达祯,许浩,等.鄂尔多斯盆地东缘“翘板”支点影响下的含煤地层发育特征[J].煤炭学报,2012,37(S2):378-382.LI Yong,TANG Dazhen,XU Hao,et al.Characterization of coal bearing strata under influence of“seesaw”fulcrum in east margin of Ordos Basin[J].Journal of China Coal Society,2012,37(S2):378-382.
[27]郭本广,许浩,孟尚志,等.临兴地区非常规天然气合探共采地质条件分析[J].洁净煤技术,2012,18(5):110-112,115.GUO Benguang,XU Hao,MENG Shangzhi,et al.Geology condition analysis for unconventional gas co-exploration and concurrent production in Linxing area[J].Clean Coal Technology,2012,18(5):110-112,115.
[28]申建,张春杰,秦勇,等.鄂尔多斯盆地临兴地区煤系砂岩气与煤层气共采影响因素和参数门限[J].天然气地球科学,2017,28(3):479-487.SHEN Jian,ZHANG Chunjie,QIN Yong,et al.Effect factors on co-mining of sandstone gas and coalbed methane in coal series and threshold of parameter in Linxing block,Ordos Basin[J].Natural Gas Geoscience,2017,28(3):479-487.
[29]杨兆彪,秦勇,高弟,等.超临界条件下煤层甲烷视吸附量、真实吸附量的差异及其地质意义[J].天然气工业,2011,31(4):13-16,122.YANG Zhaobiao,QIN Yong,GAO Di,et al.Differences between apparent and true adsorption quantity of coalbed methane under supercritical conditions and their geological significance[J].Natural Gas Industry,2011,31(4):13-16,122.
[2]孟召平,刘翠丽,纪懿明.煤层气/页岩气开发地质条件及其对比分析[J].煤炭学报,2013,38(5):728-736.MENG Zhaopin,LIU Cuili,JI Yiming.Geological conditions of coalbed methane and their comparison and shale gas exploitation analysis[J].Journal of China Coal Society,2013,38(5):728-736.
[3]赵丽娟,秦勇,申建.深部煤层吸附行为及含气量预测模型[J].高校地质学报,2012,18(3):553-557.ZHAO Lijuan,QIN Yong,SHEN Jian.Adsorption behavior and abundance predication model of deep coalbed methane[J].Geological Journal of China Universities,2012,18(3):553-557.
[4]刘大锰,李俊乾.我国煤层气分布赋存主控地质因素与富集模式[J].煤炭科学技术,2014,42(6):19-24.LIU Dameng,LI Junqian.Main geological controls on distribution and occurence and enrichment patterns of coalbed methane in China[J].Coal Science and Technology,2014,42(6):19-24.
[5]秦勇,申建,王宝文,等.深部煤层气成藏效应及其耦合关系[J].石油学报,2012,33(1):48-54.QIN Yong,SHEN Jian,WANG Baowen,et al.Accumulation effects and coupling relationship of deep coalbed methane[J].Acta Petrolei Sinica,2012,33(1):48-54.
[6]李辛子,王运海,姜昭琛,等.深部煤层气勘探开发进展与研究[J].煤炭学报,2016,41(1):24-31.LI Xinzi,WANG Yunhai,JIANG Zhaochen,et al.Progress and study on exploration and production for deep coalbed methane[J].Journal of China Coal Society,2016,41(1):24-31.
[7]郇璇,张小兵,韦欢文.基于不同类型煤吸附甲烷的吸附势重要参数探讨[J].煤炭学报,2015,40(8):1859-1864.HUAN Xuan,ZHANG Xiaobing,WEI Huanwen.Research on parameters of adsorption potential via methane adsorption of different types of coal[J].Journal of China Coal Society,2015,40(8):1859-1864.
[8]姜伟,吴财芳,姜玮,等.吸附势理论在煤层气吸附解吸研究中的应用[J].煤炭科学技术,2011,39(5):102-104.JIANG Wei,WU Caifang,JIANG Wei,et al.Application of adsorption potential theory to study on adsorption-desorption of coalbed methane[J].Coal Science and Technology,2011,39(5):102-104.
[9]李明,顾安忠,鲁雪生,等.吸附势理论在甲烷临界温度以上吸附中的应用[J].天然气化工,2003,28(5):28-31.LI Ming,GU Anzhong,LU Xuesheng,et al.Study on methane adsorption above cirtical temperature by adsorption potential theory[J].Natural Gas Chemical Industry,2003,28(5):28-31.
[10]苏现波,林萌,林晓英,等.吸附势理论在煤层甲烷吸附中的应用[J].中国煤层气,2006(2):28-30.SU Xianbo,LIN Meng,LIN Xiaoying,et al.Study of methane adsorption on coal with adsorption potential theory[J].China Coalbed Methane,2006(2):28-30.
[11]钟玲文,郑玉柱,员争荣,等.煤在温度和压力综合影响下的吸附性能及气含量预测[J].煤炭学报,2002,27(6):581-585.ZHONG Lingwen,ZHENG Yuzhu,YUN Zhengrong,et al.The adsorption capability of coal and pressure and predicted under integrated influence of temperature of content quantity of coal bed gas[J].Coal Science and Technology,2002,27(6):581-585.
[12]高然超.基于吸附势理论的构造煤甲烷吸附/解吸规律研究[D].焦作:河南理工大学,2012:13-26.GAO Ranchao.The adsorption/desorption of methane on tectonic coal based on adsorption potential theory[D].Jiaozuo:Henan Polytechnic University,2012:13-26.
[13]AMANKWAH K A G,SCHWARZ J A A.Modified approach for estimating pseudo-vapor pressures in the application of the dubininastakhov equation[J].Carbon,1995,33(9):1313-1319.
[14]OZAWA S,KUSUMI S,OGINO Y J.Physical adsorption of gases at high pressure(IV):An improvement of the Dubinin-Astakhov adsorption equation[J].Colloid&Interface Science,1976,56:83-91.
[15]赵丽娟,秦勇,WANG Geoff,等.高温高压条件下深部煤层气吸附行为[J].高校地质学报,2013,19(4):648-654.ZHAO Liguan,QIN Yong,WANG Geoff,et al.Adsorption behavior of deep coalbed methane under high temperatures and pressures[J].Geological Journal of China Universities,2013,19(4):648-654.
[16]秦勇.中国煤层气成藏作用研究进展与述评[J].高校地质学报,2012,18(3):1-6.QIN Yong.Advances and reviews on coalbed methane reservoir formation in China[J].Geological Journal of China Universities,2012,18(3):1-6.
[17]PRIBYLOV A A,SERPINSKY V V,KALASHNILOV S M.Adsorption of gases by microporous aapascals[J].Zeolites,1991:11:846-849.
[18]SINGH ALOK K.Petrographic characterization and evolution of the Karharbari coals,Talcher Coalfield,Orissa,India[J].International Journal of Coal Science&Technology,2016,3(2):133-147.
[19]秦勇,申建,沈玉林.叠置含气系统共采兼容性——煤系“三气”及深部煤层气开采中的共性地质问题[J].煤炭学报,2016,41(1):14-23.QIN Yong,SHEN Jian,SHEN Yulin.Joint mining compatibility of superposed gas-bearing systems:A general geological problem for extraction of three natural gases and deep CBM in coal series[J].Journal of China Coal Society,2016,41(1):14-23.
[20]张松航,唐书恒,万毅,等.晋城无烟煤煤中CH4和CO2运移规律研究[J].中国矿业大学学报,2012,41(5):770-775.ZHANG Songhang,TANG Shuheng,WAN Yi,et al.The migration of CH4and CO2in Jincheng anthracite coal[J].Journal of China University of Mining and Technology,2012,41(5):770-775.
[21]傅宁,杨树春,贺清,等.鄂尔多斯盆地东缘临兴-神府区块致密砂岩气高效成藏条件[J].石油学报,2016,37(S1):111-120.FU Ning,YANG Shuchun,HE Qing,et al.High-efficiency reservoir formation conditions of tight sandstone gas in Linxing-Shenfu blocks on the east margin of Ordos Basin[J].Acta Petrolei Sinica,2016,37(S1):111-120.
[22]陈家良,邵震杰,秦勇.能源地质学[M].徐州:中国矿业大学出版社,2004:94-95.
[23]苏现波,陈润,林晓英,等.吸附势理论在煤层气吸附/解吸中的应用[J].地质学报,2008,82(10):1382-1389.SU Xianbo,CHEN Run,LIN Xiaoying,et al.Application of adsorption potential theory in the fractionation of coalbed gas during the process of adsorption/desorption[J].Acta Geologica Sinica,2008,82(10):1382-1389.
[24]顾娇杨,张兵,郭明强.临兴区块深部煤层气富集规律与勘探开发前景[J].煤炭学报,2016,41(1):72-79.GU Jiaoyang,ZHANG Bing,GUO Mingqiang.Deepcoalbed methane enrichment rules and its exploration and development prospect in Linxing block[J].Journal of China Coal Society,2016,41(1):72-79.
[25]余学海,孙平,张军营,等.神府煤矿物组合特性及微量元素分布特性定量研究[J].煤炭学报,2015,40(11):2683-2689.YU Xuehai,SUN Ping,ZHANG Junying,et al.Quantitative investigations on mineral matter and distributions of trace elements in Shengfucoal[J].Journal of China Coal Society,2015,40(11):2683-2689.
[26]李勇,汤达祯,许浩,等.鄂尔多斯盆地东缘“翘板”支点影响下的含煤地层发育特征[J].煤炭学报,2012,37(S2):378-382.LI Yong,TANG Dazhen,XU Hao,et al.Characterization of coal bearing strata under influence of“seesaw”fulcrum in east margin of Ordos Basin[J].Journal of China Coal Society,2012,37(S2):378-382.
[27]郭本广,许浩,孟尚志,等.临兴地区非常规天然气合探共采地质条件分析[J].洁净煤技术,2012,18(5):110-112,115.GUO Benguang,XU Hao,MENG Shangzhi,et al.Geology condition analysis for unconventional gas co-exploration and concurrent production in Linxing area[J].Clean Coal Technology,2012,18(5):110-112,115.
[28]申建,张春杰,秦勇,等.鄂尔多斯盆地临兴地区煤系砂岩气与煤层气共采影响因素和参数门限[J].天然气地球科学,2017,28(3):479-487.SHEN Jian,ZHANG Chunjie,QIN Yong,et al.Effect factors on co-mining of sandstone gas and coalbed methane in coal series and threshold of parameter in Linxing block,Ordos Basin[J].Natural Gas Geoscience,2017,28(3):479-487.
[29]杨兆彪,秦勇,高弟,等.超临界条件下煤层甲烷视吸附量、真实吸附量的差异及其地质意义[J].天然气工业,2011,31(4):13-16,122.YANG Zhaobiao,QIN Yong,GAO Di,et al.Differences between apparent and true adsorption quantity of coalbed methane under supercritical conditions and their geological significance[J].Natural Gas Industry,2011,31(4):13-16,122.