Advances in Experimental Methods, Adsorption Models, and Adsorbed Phase Density of High-Temperature High-Pressure Methane Adsorption on Deep Coal Reservoirs

Chi Cui

doi:10.63313/Engineering.4003

Authors

Chi Cui School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China Author

DOI:

https://doi.org/10.63313/Engineering.4003

Keywords:

Deep Coal Reservoir, High Temperature and High Pressure, Isothermal Adsorption, Adsorption Model, Adsorbed Phase Density

Abstract

Deep coal reservoirs exist in high-temperature, high-pressure conditions, with methane in a supercritical state, displaying an "asymmetric unimodal" shaped isothermal adsorption curve.Notably, the excess adsorption capacity and the absolute adsorption capacity diverge significantly in the high-pressure region, indicating that their adsorption behaviors differ fundamentally from those observed in shallow coal reservoirs.To precisely assess gas content and adsorption capacity in deep coal reservoirs, three key challenges must be tackled: ensuring reliable measurement of high-pressure isothermal adsorption data, selecting appropriate adsorption models for supercritical conditions, and accurately determining the virtual parameter of adsorption phase density. This review addresses experimental techniques (gravimetric and volumetric methods), adsorption models (Langmuir, BET, D-A, etc.), and approaches for determining adsorption phase density (liquid phase density, empirical formula, intercept, model fitting, etc.), comparing their principles, conditions of applicability, and limitations. The aim is to furnish a more precise methodological foundation for evaluating and exploiting deep coalbed methane resources.

References

[1] 陈建奇,胡维强,李洋冰,等.鄂尔多斯盆地东缘临兴-神府区块深部煤储层孔隙结构对甲烷吸附影响研究[J].岩矿测试,2026,45(01):116-130.DOI:10.15898/j.ykcs.202506080156.

[2] 冯文青,魏强,崔福田,等.深部煤甲烷吸附性能及含气量预测分析[J].煤炭技术,2021,40(09):131-134.DOI:10.13301/j.cnki.ct.2021.09.034.

[3] 柴琳,吴世跃,牛煜,等.深部煤层超临界甲烷吸附量预测研究[J].矿业安全与环保,2018,45(04):27-31.

[4] 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. DOI:10.1021/ef300405g.

[5] Tian H, Li T F, Zhang T W, et al. Characterization of methane adsorption on overmature Lower Silurian-Upper Ordovician shales in Sichuan Basin, southwest China: Experimental results and geological implications[J]. International Journal of Coal Geology, 2016, 156: 36-49.

[6] Heller R, Zoback M. Adsorption of methane and carbon dioxide on gas shale and pure mineral samples[J]. Journal of Unconventional Oil and Gas Resources, 2014, 8: 14-24. DOI:10.1016/j.juogr.2014.06.001.

[7] 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.

[8] Linstrom P J, Mallard W G. NIST Standard Reference Database Number 69[J]. 2001.

[9] 刘圣鑫,钟建华,马寅生,等.柴东石炭系页岩微观孔隙结构与页岩气等温吸附研究[J].中国石油大学学报(自然科学版),2015,39(01):33-42.

[10] 王玉普,左罗,胡志明,等.页岩高温高压吸附实验及吸附模型[J].中南大学学报(自然科学版),2015,46(11):4129-4135.

[11] 侯晓伟,王猛,刘宇,刘娇男,宋昱.页岩气超临界状态吸附模型及其地质意义[J].中国矿业大学学报,2016,45(1):111-118.

[12] Jia T, Zhang S, Wang M, et al. From apparent equilibrium to limiting state: Adsorbed phase density kinetics of supercritical methane and its implications for adsorption-diffusion in deep coalbed reservoirs[J]. Chemical Engineering Journal, 2026, 534: 175147. DOI:10.1016/J.CEJ.2026.175147.

[13] 钟玲文.煤的吸附性能及影响因素[J].地球科学,2004,(03):327-332+368.

[14] 王延斌,陶传奇,倪小明,等.基于吸附势理论的深部煤储层吸附气量研究[J].煤炭学报,2018,43(06):1547-1552. DOI:10.13225/j.cnki.jccs.2018.4044.

[15] 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,(06):581-585. DOI:10.13225/j.cnki.jccs.2002.06.005.

[16] 赵丽娟,秦勇,Geoff Wang,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(04):648-654. DOI:10.16108/j.issn1006-7493.2013.04.007.

[17] 张明杰,刘浩,贾天让,等.颗粒煤超临界态甲烷吸附相密度特征研究[J].煤田地质与勘探,2021,49(05):105-113.

[18] Nounou N M, Nounou N H. Multiscale estimation of the Freundlich adsorption isotherm[J]. International Journal of Environmental Science and Technology, 2010, 7(3): 509.

[19] Sentaro Ozawa, et al. Physical adsorption of gases at high pressure. IV. An improvement of the Dubinin—Astakhov adsorption equation[J]. Journal of Colloid & Interface Science, 1976. DOI:10.1016/0021-9797(76)90149-1.

[20] LI Zhou, ZHANG Jianshe, ZHOU Yaping. A simple isotherm equation for modeling the adsorption equilibria on porous solids over wide temperature ranges[J]. Langmuir, 2001, 17(18): 1158-1169. DOI:10.1021/la010005p.

[21] 赵龙,秦勇,杨兆彪,等.煤中超临界甲烷等温吸附模型研究[J].天然气地球科学,2014,25(05):753-760.

[22] 宋昱,姜波,李明,等.低中煤级构造煤超临界甲烷吸附特性及吸附模型适用性[J].煤炭学报,2017,42(08):2063-2073. DOI:10.13225/j.cnki.jccs.2016.1853.

[23] 据宜文,姜波,侯泉林,等.构造煤结构成分应力效应的傅里叶变换红外光谱研究[J].光谱学与光谱分析,2005,25(8):1216-1220.

[24] Dubinin V A. Development of the concept of volume filling of micropores in the adsorption of gases and vapors by microporous adsorbents[J]. Russian Chemical Bulletin, 1971. DOI:10.1007/BF00849309.

[25] Schwarz K A. A modified approach for estimating pseudo-vapor pressures in the application of the Dubinin-Astakhov equation[J]. Carbon, 1995. DOI:10.1016/0008-6223(95)00079-S.

[26] 于洪观,范维唐,孙茂远,等.煤中甲烷等温吸附模型的研究[J].煤炭学报,2004,(04):463-467. DOI:10.13225/j.cnki.jccs.2004.04.019.

[27] 白鹏飞,史广山,张玉贵,等.超临界状态下构造煤甲烷等温吸附模型研究[J].煤炭技术,2018,37(10):219-222. DOI:10.13301/j.cnki.ct.2018.10.081.

[28] 刘会虎,范正谱,徐宏杰,等.煤层甲烷吸附相密度、吸附模型、吸附机理的再认识[J].煤炭学报,2023,48(10):3806-3817. DOI:10.13225/j.cnki.jccs.sq23.0466.

[29] 石军太,吉义天宇,贺甲元,等.考虑变吸附相密度的深部煤层气吸附模型参数确定方法[J].钻采工艺, 2025,48(03):127-138.

[30] 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.

[31] 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(09):3208-3218. DOI:10.13225/j.cnki.jccs.2019.0806.

[32] 杨兆彪,秦勇,高弟,陈润.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.

[33] Clarkson C R, Haghshenas B. Modeling of Supercritical Fluid Adsorption on Organic-Rich Shales and Coal[J]. 2013. DOI:10.2118/164532-ms.

[34] Ross D J K, Bustin R M. Impact of mass balance calculations on adsorption capacities in microporous shale gas reservoirs[J]. 2007, 86(17-18): 2696-2706. DOI:10.1016/j.fuel.2007.02.036.

[35] Wu S, Tang D, Li S, et al. Coalbed methane adsorption behavior and its energy variation features under supercritical pressure and temperature conditions[J]. Journal of Petroleum Science and Engineering, 2016, 146: 9. DOI:10.1016/j.petrol.2016.07.028.