Coal Geology & Exploration


Finding out the characteristics of supercritical methane adsorption phase density of granular coal is the basis of studying the influence of temperature and pressure on methane adsorption amount of coal sample. Granular coal samples collected from Hebi No.6 Mine and Longshan Mine in Anyang-Hebi Coalfield were used to measure the isothermal adsorption lines at temperatures of 308 K, 313 K and 318 K, and pressures of 1-24 MPa by magnetic suspension balance isotherm adsorption device. The intercept method, Langmuir ternary model fitting method and liquid phase density method were used to calculate the adsorbed phase density at adsorption saturation and find out the influencing factors. By the method of constant adsorption phase volume, on the one hand, the adsorbed phase density were calculated, and the experimental phenomenon of negative value and peak inflection point of excess adsorption capacity was explained; on the other hand, a relatively ideal absolute adsorption capacity has been calibrated. The calculation results of adsorbed phase density show that the methane adsorption phase density is affected by temperature, pressure and coal metamorphism degree: it decreases with the increase of temperature, and increases rapidly with the increase of pressure at first, and then gradually slows down. The saturated adsorption phase density of anthracite is between 121.60-137.02 kg/m3, and that of meager lean coal is between 73.29-76.96 kg/m3. The calculation results of absolute adsorption capacity show that the absolute adsorption capacity corrected by liquid density method would appear negative value, which is obviously inconsistent with the reality; the absolute adsorption capacity corrected by intercept method and Langmuir ternay model method changes with the change of experimental conditions, in combination with the variation of adsorption constant b, the Langmuir ternary model is found to be the most suitable method to describe the adsorption behavior of supercritical methane.


granular coal, supercritical methane, adsorbed phase density, excess adsorption capacity, absolute adsorption capacity




[1] SUN Qinping, ZHAO Qun, JIANG Xinchun, et al. Prospects and strategies of CBM exploration and development in China under the new situation[J]. Journal of China Coal Society, 2021, 46(1): 65–76. 孙钦平, 赵群, 姜馨淳, 等. 新形势下中国煤层气勘探开发前景与对策思考[J]. 煤炭学报, 2021, 46(1): 65–76.

[2] YUAN Liang. Strategic thinking of simultaneous exploitation of coal and gas in deep mining[J]. Journal of China Coal Society, 2016, 41(1): 1–6. 袁亮. 我国深部煤与瓦斯共采战略思考[J]. 煤炭学报, 2016, 41(1): 1–6.

[3] ZHANG Xinbin, SONG Dangyu, LI Yunbo, et al. Study on density of the supercritical methane[J]. Coal Geology & Exploration, 2021, 49(1): 137–142. 张新宾, 宋党育, 李云波, 等. 超临界态甲烷密度研究[J]. 煤田地质与勘探, 2021, 49(1): 137–142.

[4] ZHOU Shangwen, WANG Hongyan, XUE Huaqing, et al. Difference between excess and absolute adsorption capacity of shale and a new shale gas reserve calculation method[J]. Natural Gas Industry, 2016, 36(11): 12–20. 周尚文, 王红岩, 薛华庆, 等. 页岩过剩吸附量与绝对吸附量的差异及页岩气储量计算新方法[J]. 天然气工业, 2016, 36(11): 12–20.

[5] ZHOU Shangwen, XUE Huaqing, GUO Wei, et al. Supercritical isothermal adsorption characteristics of shale gas based on gravimetric method[J]. Journal of China Coal Society, 2016, 41(11): 2806–2812. 周尚文, 薛华庆, 郭伟, 等. 基于重量法的页岩气超临界吸附特征实验研究[J]. 煤炭学报, 2016, 41(11): 2806–2812.

[6] ZHANG Qun, SANG Shuxun, ZHONG Lingwen, et al. Adsorption characteristics and gas storage mechanism of coalbed methane[M]. Beijing: Science Press, 2018. 张群, 桑树勋, 钟玲文, 等. 煤层气吸附特征及储气机理[M]. 北京: 科学出版社, 2018.

[7] LIU Cao, ZHANG Yugui, JIA Tianrang, et al. New interpretation of adsorption test mechanism and adsorption law for gas source rock[J]. Journal of China Coal Society, 2019, 44(11): 3441–3452. 刘操, 张玉贵, 贾天让, 等. 气源岩吸附试验的机理及吸附特征新认识[J]. 煤炭学报, 2019, 44(11): 3441–3452.

[8] YU Lingjie, FAN Ming, CHEN Hongyu, et al. Isothermal adsorption experiment of organic-rich shale under high temperature and pressure using gravimetric method[J]. Acta Petrolei Sinica, 2015, 36(5): 557–563. 俞凌杰, 范明, 陈红宇, 等. 富有机质页岩高温高压重量法等温吸附实验[J]. 石油学报, 2015, 36(5): 557–563.

[9] ZHU Hanqing, JIA Ailin, WEI Yunsheng, et al. Pore structure and supercritical methane sorption capacity of organic-rich shales in southern Sichuan Basin[J]. Acta Petrolei Sinica, 2018, 39(4): 391–401. 朱汉卿, 贾爱林, 位云生, 等. 蜀南地区富有机质页岩孔隙结构及超临界甲烷吸附能力[J]. 石油学报, 2018, 39(4): 391–401.

[10] XIONG Jian, LIU Xiangjun, LIANG Lixi. Isothermal adsorption model of supercritical methane in shale[J]. Petroleum Drilling Techniques, 2015, 43(3): 96–102. 熊健, 刘向君, 梁利喜. 页岩中超临界甲烷等温吸附模型研究[J]. 石油钻探技术, 2015, 43(3): 96–102.

[11] LIU Shengxin, ZHONG Jianhua, MA Yinsheng, et al. Super-critical isothermal adsorption of gas in shale[J]. Coal Geology & Exploration, 2015, 43(3): 45–50. 刘圣鑫, 钟建华, 马寅生, 等. 页岩中气体的超临界等温吸附研究[J]. 煤田地质与勘探, 2015, 43(3): 45–50.

[12] DONG Yintao, JU Binshan, LIU Nannan. Evaluation and improvement of high-pressure isothermal adsorption model for methane in shale[J]. Journal of China Coal Society, 2020, 45(9): 3208–3218. 董银涛, 鞠斌山, 刘楠楠. 页岩甲烷高压等温吸附模型评价与改进[J]. 煤炭学报, 2020, 45(9): 3208–3218.

[13] ZHOU Shangwen, LI Qi, XUE Huaqing, et al. Comparative study on the volumetric and gravimetric method for isothermal adsorption experiment of shale[J]. Chemical Industry and Engineering Progress, 2017, 36(5): 1690–1697. 周尚文, 李奇, 薛华庆, 等. 页岩容量法和重量法等温吸附实验对比研究[J]. 化工进展, 2017, 36(5): 1690–1697.

[14] SEⅡCHI K, TASTSUO I, IKUO A. Adsorption science[M]. Beijing: Chemical Industry Press, 2006: 180–181. 近藤精一, 石川达雄, 安部郁夫. 吸附科学[M]. 北京: 化学工业出版社, 2006: 180–181.

[15] CHENG Yuanping, LIU Hongyong, GUO Pinkun, et al. A theoretical model and evolution characteristic of mining-enhanced permeability in deeper gassy coal seam[J]. Journal of China Coal Society, 2014, 39(8): 1650–1658. 程远平, 刘洪永, 郭品坤, 等. 深部含瓦斯煤体渗透率演化及卸荷增透理论模型[J]. 煤炭学报, 2014, 39(8): 1650–1658.

[16] HE Manchao, GUO Pingye. Deep rock mass thermodynamic effect and temperature control measures[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(12): 2377–2393. 何满潮, 郭平业. 深部岩体热力学效应及温控对策[J]. 岩石力学与工程学报, 2013, 32(12): 2377–2393.

[17] ZHOU Li, LI Ming, ZHOU Yaping. Adsorption measurement and theoretical analysis of supercritical methane on super activated carbon[J]. Science in China(Series B), 2000, 30(1): 49–56. 周理, 李明, 周亚平. 超临界甲烷在高表面活性炭上的吸附测量及其理论分析[J]. 中国科学(B辑), 2000, 30(1): 49–56.

[18] ZHANG Zimin, ZHANG Yugui, TANG Dazhen, et al. Gas geology[M]. Xuzhou: China University of Mining and Technology Press, 2009. 张子敏, 张玉贵, 汤达祯, 等. 瓦斯地质学[M]. 徐州: 中国矿业大学出版社, 2009.

[19] GASPARIK M, GHANIZADEH A, BERTIER P, et al. High-pressure methane sorption isotherms of black shales from the Netherlands[J]. Energy & Fuels, 2012, 26(8): 4995–5004.

[20] YANG Zhaobiao, QIN Yong, GAO Di, et al. Differences between apparent and ture adsorption quantity of coalbed methane under supercritical conditions and their geological siginificance[J]. Natural Gas Industry, 2011, 31(4): 13–16. 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.



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