Mechanisms of deep coalbed methane occurrence: Review and perspectives
Abstract
Deep coalbed methane occurs in geological settings characterized by high stress, high temperature, and high pressure, commonly referred to as “three-high” conditions. Owing to differences in genetic types, reservoir properties, and gas phases, its occurrence mechanisms differ substantially from those of shallow coalbed methane. Existing studies have generally reached a consensus on its occurrence boundaries and enrichment patterns. Based on an extensive literature review and representative cases from global basins, this review synthesized the genetic classifications, reservoir property evolution, coupled temperature-pressure-stress effects, hydrodynamic sealing conditions, and enrichment patterns of deep coalbed methane. A comprehensive formula for determining critical depth was proposed by integrating stress transition depth, adsorption capacity inflection point, and multiple geological parameters. This formula can be applied to regional-scale predictions and data-limited conditions. A coupled fracture-seepage-matrix-diffusion equation was established, and a revised productivity prediction model was developed. Existing evidence indicates that deep coalbed methane commonly forms through multistage hydrocarbon generation. It is dominated by thermogenic gas, with minor biogenic contributions. Gas mainly occurs in the adsorbed state, whereas the proportion of free gas increases with burial depth. Its enrichment is governed by structural style, cap rock sealing capacity, and fracture evolution. Critical depth indicators that were previously evaluated independently were integrated into a comprehensive multifactor criterion. The occurrence characteristics and migration behavior of deep coalbed methane were elucidated. The main controls on reservoir productivity were identified. These results provide theoretical support for efficient exploration and targeted exploitation of deep coalbed methane resources.
Document Type: Invited review
Cited as: Li, S., Li, X., Tang, Y., Chen, Y., Quaye, J. A., Hu, C. Mechanisms of deep coalbed methane occurrence: Review and perspectives. Advances in Geo-Energy Research, 2026, 21(1): 42-59. https://doi.org/10.46690/ager.2026.07.06
DOI:
https://doi.org/10.46690/ager.2026.07.06Keywords:
Deep coalbed methane, critical depth, occurrence mechanism, enrichment pattern, langmuir equation, CO₂ sequestrationReferences
Ali Aghighi, M., Cui, T., Schöning, G., et al. Subsidence associated with dewatering and gas extraction from coal seams: Contribution of desorption-induced coal shrinkage. Journal of Hydrology, 2024, 637: 131355.
Anees, A., Zhang, H., Ashraf, U., et al. Sand-ratio distribution in an unconventional tight sandstone reservoir of Hangjinqi area, Ordos Basin: Acoustic impedance inversion-based reservoir quality prediction. Frontiers in Earth Science, 2022, 10: 1018105.
Asif, M., Wang, L., Naveen, P., et al. Influence of competitive adsorption, diffusion, and dispersion of CH₄ and CO₂ gases during the CO₂-ECBM process. Fuel, 2024, 358: 130065.
Asif, M., Wang, L., Panigrahi, D. C., et al. Integrated assessment of CO₂-ECBM potential in Jharia Coalfield, India. Scientific Reports, 2022, 12(1): 7533.
Asmussen, P., Pidgeon, B., Gaede, O., et al. Deciphering a cryptic unconformity in the Surat Basin using high-frequency detrital zircon U-Pb geochronology: Insights into basin dynamics on the north-east margin of Gondwana. Gondwana Research, 2023, 118: 117-134.
Bannerjee, M., Mendhe, V. A., Kamble, A. D., et al. Facets of coalbed methane reservoir in East Bokaro Basin, India. Journal of Petroleum Science and Engineering, 2022, 208: 109255.
Bao, Y., Wei, C., Wang, C., et al. Geochemical characteristics and generation process of mixed biogenic and thermogenic coalbed methane in Luling coalfield, China. Energy & Fuels, 2014, 28(7): 4392-4401.
Brakel, A. T., Totterdell, J. M., Wells, A. T., et al. Sequence stratigraphy and fill history of the Bowen Basin, Queensland. Australian Journal of Earth Sciences, 2009, 56(3): 401-432.
Bustin, A. M. M., Bustin, R. M., Chikatamarla, L., et al. Learnings from a failed nitrogen enhanced coalbed methane pilot: Piceance Basin, Colorado. International Journal of Coal Geology, 2016, 165: 64-75.
Cao, A., Jing, G., Dou, L., et al. Statistical analysis of distribution patterns of coal seams in fold zones in Northwest China. International Journal of Mining Science and Technology, 2018, 28(5): 819-828.
Cao, Z., Lin, B., Liu, T. The impact of depositional environment and tectonic evolution on coalbed methane occurrence in West Henan, China. International Journal of Mining Science and Technology, 2019, 29(2): 297-305.
Chelgani, S. C., Hower, J. C., Mastalerz, M., et al. Anomalies in Vicker’s microhardness of subbituminous and high volatile bituminous coals. International Journal of Coal Geology, 2024, 296: 104659.
Chen, R., Bao, Y., Zhang, Y. A review of biogenic coalbed methane experimental studies in China. Microorganisms, 2023, 11(2): 304.
Chen, S., Tang, D., Tao, S., et al. In-situ stress measurements and stress distribution characteristics of coal reservoirs in major coalfields in China: Implication for coalbed methane (CBM) development. International Journal of Coal Geology, 2017, 182: 66-84.
Coe, H. H., Birgenheier, L. P., Fernandez, D. P., et al. Rare earth element enrichment in coal and coal-adjacent strata of the Uinta Region, Utah and Colorado. Frontiers in Earth Science, 2024, 12: 1381152.
Cui, T., Schoning, G., Gallagher, M., et al. A Coupled Hydro-Mechanical Modeling Framework to Concurrently Simulate Coal Seam Gas Induced Subsidence and Groundwater Impacts. Water Resources Research, 2025, 61: e2024WR039280.
Cumella, S. P., Scheevel, J. The Influence of Stratigraphy and Rock Mechanics on Mesaverde Gas Distribution, Piceance Basin, Colorado, in Understanding, Exploring, and Developing Tight-gas Sands, edited by S. P. Cumella, K. W. Shanley, and W. K. Camp, AAPG, Tulsa, Oklahoma, 2008.
Davydov, V. I. Tunguska coals, Siberian sills and the Permian-Triassic extinction. Earth-Science Reviews, 2021, 212: 103438.
Dunlop, E. C., Warner, D. S., Warner, P. E. R., et al. Ultra-deep Permian coal gas reservoirs of the Cooper Basin: Insights from new studies. The APPEA Journal, 2017, 57(1): 218-262.
Eberle, J., Cohen, J., Foster, J., et al. A new Late Cretaceous metatherian from the Williams Fork Formation, Colorado. PLOS One, 2024, 19(10): e0310948.
Everts, A. J. W., Alessio, L. D., Connell, C. J. Subsurface high-grading potential in coal seam gas in eastern Australia. Australian Journal of Earth Sciences, 2024, 71(1): 31-51.
Fall, A., Eichhubl, P., Cumella, S. P., et al. Testing the basin-centered gas accumulation model using fluid inclusion observations: Southern Piceance Basin, Colorado. AAPG Bulletin, 2012, 96(12): 2297-2318.
Freij-Ayoub, R. Opportunities and challenges to coal bed methane production in Australia. Journal of Petroleum Science and Engineering, 2012, 88-89: 1-4.
Fu, J., Li, B., Ren, C., et al. Study on Elastoplastic Damage Constitutive Model and Permeability Evolution Law of Gas-Bearing Coal. Rock Mechanics and Rock Engineering, 2024, 57(11): 9183-9205.
Ghosh, S., Ojha, A., Varma, A. K. Geochemical signatures of potassium metasomatism in anthracite from the Himalayan fold-thrust belts of Sikkim, India. International Journal of Coal Science & Technology, 2022, 9(1): 29.
Glatz, G., Alafnan, S., Gholami, R., et al. Effect of kerogen maturity on the adsorption capacity of CO₂ and CH₄: A molecular investigation. Fuel, 2022, 327: 125188.
Godec, M., Koperna, G., Gale, J. CO₂-ECBM: A review of its status and global potential. Energy Procedia, 2014, 63: 5858-5869.
Golding, S. D., Baublys, K. A., Glikson, M., et al. Source and Timing of Coal Seam Gas Generation in Bowen Basin Coals, in Coalbed Methane: Scientific, Environmental and Economic Evaluation, edited by M. Mastalerz, M. Glikson, and S.D. Golding, Springer, Dordrecht, pp. 257-269, 1999.
Govindarajan, S. K., Pavan, T. N. V., Devarapu, S. R., et al. Critical review on challenges in the application of Darcy’s law for multi-phase fluid flow in petroleum reservoirs. Discover Applied Sciences, 2025, 7(3): 201.
Guang, W., Liu, X., Zhang, Z., et al. Nano-confinement effect on multi-mechanistic CO₂-CH₄ transport in coal: Upscaling from molecular dynamics to core experiments. Gas Science and Engineering, 2026, 149: 205885.
Hamilton, S. K., Golding, S. D., Esterle, J. S., et al. Controls on gas domains and production behaviour in a high-rank CSG reservoir: Insights from molecular and isotopic chemistry of co-produced waters and gases from the Bowen Basin, Australia. Geosciences, 2020, 10(2): 74.
Hazra, B., Wood, D. A., Panda, M., et al. Pore structural complexities and gas storage capacity of Indian coals with various thermal maturities. Energy & Fuels, 2025, 39(12): 5818-5831.
He, Y., Li, X., Cai, J., et al. Study of key factors for efficient coalbed methane extraction: Pore structure, desorption rate and seepage characteristics. Langmuir, 2025, 41(9): 6020-6036.
He, Z., Hu, Z., Nie, H., et al. Characterization of shale gas enrichment in the Wufeng Formation-Longmaxi Formation in the Sichuan Basin of China and evaluation of its geological construction-transformation evolution sequence. Journal of Natural Gas Geoscience, 2017, 2(1): 1-10.
Huang, J., Zhai, C., Sun, Y., et al. Nanoconfined methane recovery enhancement in deep coal seams via flue gas thermal stimulation: Molecular-level insights from realistic macromolecular models. Fuel, 2026, 404: 136157.
Huang, W., Li, J., Liu, Z., et al. Study of a low-disturbance pressure-preserving corer and its coring performance in deep coal mining conditions. International Journal of Mining Science and Technology, 2023, 33(11): 1397-1410.
Huang, Z., Sednek, C., Urynowicz, M. A., et al. Low carbon renewable natural gas production from coalbeds and implications for carbon capture and storage. Nature Communications, 2017, 8(1): 568.
Hu, H., Liu, S., Li, Z., et al. Pore and chemical structural evolution of coals with different ranks induced by supercritical CO₂: Combined experimental and multi-scale simulation study. Geoenergy Science and Engineering, 2026, 265: 214600.
Inagaki, F., Hinrichs, K. U., Kubo, Y., et al. Exploring deep microbial life in coal-bearing sediment down to 2.5 km below the ocean floor. Science, 2015, 349: 420-424.
Jiang, K., Ashworth, P. The development of Carbon Capture Utilization and Storage (CCUS) research in China: A bibliometric perspective. Renewable and Sustainable Energy Reviews, 2021, 138: 110521.
Jiang, L., Chen, Z., Farouq Ali, S. M., et al. Storing carbon dioxide in deep unmineable coal seams for centuries following underground coal gasification. Journal of Cleaner Production, 2022, 378: 134565.
Ji, Y., Li, S., Hou, W., et al. Influence of pore space of deep coal reservoirs on gas occurrence: A case study of Daning-Jixian area. International Journal of Hydrogen Energy, 2026, 227: 154388.
Johnson, R. C. Geologic history and hydrocarbon potential of Late Cretaceous-age, low-permeability reservoirs, Piceance Basin, western Colorado. Washington, D.C., USA, US Government Printing Office, 1989.
Johnson, R. C., Flores, R. M. Developmental geology of coalbed methane from shallow to deep in Rocky Mountain basins and in Cook Inlet - Matanuska basin, Alaska, U.S.A. and Canada. International Journal of Coal Geology, 1998, 35(1-4): 241-282.
Ju, W., Dong, J., Chang, C. Evolution of methane permeability and fracture structure of coal: Implications for methane extraction in deep coal seams. RSC Advances, 2022, 12(47): 30227-30235.
Ju, W., Shen, J., Qin, Y., et al. In-situ stress distribution and coalbed methane reservoir permeability in the Linxing area, eastern Ordos Basin, China. Frontiers of Earth Science, 2018, 12(3): 545-554.
Kang, H., Gao, F., Xu, G., et al. Mechanical behaviors of coal measures and ground control technologies for China’s deep coal mines - A review. Journal of Rock Mechanics and Geotechnical Engineering, 2023, 15(1): 37-65.
Kędzior, S., Teper, L. Coal properties and coalbed methane potential in the southern part of the Upper Silesian Coal Basin, Poland. Energies, 2023, 16(7): 3219.
Kędzior, S., Teper, L. Occurrence and potential for coalbed methane extraction in the depocenter area of the Upper Silesian coal Basin (Poland) in the context of selected geological factors. Energies, 2024, 17(11): 2592.
Langmuir, I. The Adsorption of Gases on Plane Surfaces of Glass, Mica and Platinum. Journal of the American Chemical Society, 1918, 40(9): 1361-1403.
Lee, H., Muirhead, J. D., Fischer, T. P., et al. Massive and prolonged deep carbon emissions associated with continental rifting. Nature Geoscience, 2016, 9(2): 145-149.
Li, G., Jia, C., Zhao, Q., et al. Coal-rock gas accumulation mechanism and the whole petroleum system of coal measures. Petroleum Exploration and Development, 2025, 52(1): 33-49.
Li, G., Wang, G., Feng, N., et al. Deep coal-rock gas in China: A review of distribution, geological characteristics, and its enrichment conditions. ACS Omega, 2025, 10(22): 23472-23491.
Li, S., Qin, Y., Tang, D., et al. A comprehensive review of deep coalbed methane and recent developments in China. International Journal of Coal Geology, 2023, 279: 104369.
Li, S., Shao, L., Liu, J., et al. Oil generation model of the liptinite-rich coals: Palaeogene in the Xihu Sag, East China Sea Shelf Basin. Journal of Petroleum Science and Engineering, 2022, 209: 109844.
Li, S., Tang, D., Pan, Z., et al. Geological conditions of deep coalbed methane in the eastern margin of the Ordos Basin, China: Implications for coalbed methane development. Journal of Natural Gas Science and Engineering, 2018, 53: 394-402.
Li, Y., Zhai, C., Zhang, L., et al. Full-field experimental investigation of heat transfer and thermoelastic response during steam injection into coal seam borehole. Advances in Geo-Energy Research, 2026, 20(1): 27-42.
Li, Z., Li, S., Yu, X., et al. Coal bed methane enrichment regularities and controlling factors in Bowen-Surat basin, Australia. Coal Geology & Exploration, 2014, 42(6): 29-33. (in Chinese)
Li, Z., Zeng, Q., Xu, M., et al. Peat formation and accumulation mechanism in northern marginal basin of South China Sea. Acta Oceanologica Sinica, 2021, 40(2): 95-106.
Liu, C., Yang, Z., Qin, Y., et al. Excess pore pressure behavior and evolution in deep coalbed methane reservoirs. International Journal of Mining Science and Technology, 2024, 34(6): 763-781.
Liu, D., Jia, Q., Cai, Y., et al. A new insight into coalbed methane occurrence and accumulation in the Qinshui Basin, China. Gondwana Research, 2022, 111: 280-297.
Liu, S., Wang, H., Sang, S., et al. Effects of pore structure changes on the CH₄ adsorption capacity of coal during CO₂-ECBM. Fuel, 2022, 330: 125529.
Longinos, S. N., Begaliyev, D., Asif, M., et al. Cryogenic fracturing of coal with LN₂ treatment: A sustainable approach for enhancing coalbed methane extraction in water-scarce regions. Gas Science and Engineering, 2025, 142: 205686.
Lu, B., Yang, Z., Hou, Y., et al. Desorption-diffusion specificity of deep coalbed methane under high-temperature effects: Implications for development. International Journal of Mining Science and Technology, 2025, 35(9): 1511-1527.
Lu, Y., Han, J., Zhang, H., et al. Study on coal seam physical characteristics and influence on stimulation: A case study of coal seams in Zhengzhuang Block. Frontiers in Earth Science, 2023, 10: 1031419.
Lv, D., Song, Y., Shi, L., et al. The complex transgression and regression history of the northern margin of the Palaeogene Tarim Sea (NW China), and implications for potential hydrocarbon occurrences. Marine and Petroleum Geology, 2020, 112: 104041.
Lv, F., Yang, R., Gao, W., et al. Critical depth prediction based on in-situ stress and gas content model of deep coalbed methane in Liupanshui Coalfield in China. Scientific Reports, 2025, 15(1): 297.
Masum, S. A., Sadasivam, S., Chen, M., et al. Low subcritical CO₂ adsorption-desorption behavior of intact bituminous coal cores extracted from a shallow coal seam. Langmuir, 2023, 39(4): 1548-1561.
Mohamed, T., Mehana, M. Coalbed methane characterization and modeling: Review and outlook. Energy Sources Part A: Recovery Utilization and Environmental Effects, 2025, 47(1): 2874-2896.
Mohanty, M. M., Pal, B. K. Sorption behavior of coal for implication in coal bed methane an overview. International Journal of Mining Science and Technology, 2017, 27: 307-314.
Moore, T. A. Coalbed methane: A review. International Journal of Coal Geology, 2012, 101: 36-81.
Mostafa, A., Scholtès, L., Golfier, F. Pore-scale hydromechanical modeling of gas transport in coal matrix. Fuel, 2023, 345: 128165.
Mudoi, M. P., Sharma, P., Khichi, A. S. A review of gas adsorption on shale and the influencing factors of CH₄ and CO₂ adsorption. Journal of Petroleum Science and Engineering, 2022, 217: 110897.
Mukherjee, M., Misra, S. A review of experimental research on Enhanced Coal Bed Methane (ECBM) recovery via CO₂ sequestration. Earth-Science Reviews, 2018, 179: 392-410.
Mwakipunda, G. C., Wang, Y., Mgimba, M. M., et al. Recent Advances in Carbon Dioxide Sequestration in Deep Unmineable Coal Seams Using CO₂-ECBM Technology: Experimental Studies, Simulation, and Field Applications. Energy & Fuels, 2023, 37(22): 17161-17186.
Oremland, R. S., Polcin, S. Methanogenesis and sulfate reduction: Competitive and noncompetitive substrates in estuarine sediments. Applied and Environmental Microbiology, 1982, 44(6): 1270-1276.
Pajdak, A., Kudasik, M., Skoczylas, N., et al. Studies on the competitive sorption of CO₂ and CH₄ on hard coal. International Journal of Greenhouse Gas Control, 2019, 90: 102789.
Pandey, S., Flook, S., Cox, R., et al. Underground water impact report 2021 for the Surat cumulative management area. Brisbane, Department of Regional Development, Manufacturing and Water, 2021.
Pang, X., Jia, C., Chen, J., et al. A unified model for the formation and distribution of both conventional and unconventional hydrocarbon reservoirs. Geoscience Frontiers, 2021, 12(2): 695-711.
Panwar, D. S., Suman, S., Singh, A. K., et al. Assessment of hydrocarbon generation potential of bituminous coal from Raniganj Basin, India. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020, 42(7): 824-834.
Pedersen, K. Exploration of deep intraterrestrial microbial life: Current perspectives. Fems Microbiology Letters, 2000, 185(1): 9-16.
Perera, M. A comprehensive overview of CO₂ flow behaviour in deep coal seams. Energies, 2018, 11(4): 906.
Qin, Y., Moore, T. A., Shen, J., et al. Resources and geology of coalbed methane in China: A review. International Geology Review, 2018, 60(5-6): 777-812.
Rafiei Renani, H., Cai, M. Forty-year review of the Hoek-Brown failure criterion for jointed rock masses. Rock Mechanics and Rock Engineering, 2022, 55(1): 439-461.
Rajabi, M., Ziegler, M., Heidbach, O., et al. Contribution of mine borehole data toward high-resolution stress mapping: An example from northern Bowen Basin, Australia. International Journal of Rock Mechanics and Mining Sciences, 2024, 173: 105630.
Ren, Y., Yuan, Q., Jiang, D., et al. A non-Darcy gas flow model for coalbed methane in mine gobs. Physics of Fluids, 2021, 33(11): 116601.
Sahlström, F., Dirks, P., Chang, Z., et al. The Paleozoic Mount Carlton deposit, Bowen basin, northeast Australia: Shallow high-sulfidation epithermal Au-Ag-Cu mineralization formed during rifting. Economic Geology, 2018, 113(8): 1733-1767.
Salmachi, A., Rajabi, M., Wainman, C., et al. History, geology, in situ stress pattern, gas content and permeability of coal seam gas basins in Australia: A review. Energies, 2021, 14(9): 2651.
Sampath, K. H. S. M., Perera, M. S. A., Ranjith, P. G., et al. CH₄-CO₂ gas exchange and supercritical CO₂ based hydraulic fracturing as CBM production-accelerating techniques: A review. Journal of CO₂ Utilization, 2017, 22: 212-230.
Scott, A. R., Kaiser, W. R., Ayers Jr, W. B. Thermogenic and Secondary Biogenic Gases, San Juan Basin, Colorado and New Mexico — Implications for Coalbed Gas Producibility. AAPG Bulletin, 1994, 78(8): 1186-1209.
Song, J., Liu, C., Liu, Y. Mechanism of coalbed methane migration and production based on micro-pore overpressure environment. Petroleum Science and Technology, 2022, 40(24): 2971-2987.
Song, Y., Liu, S., Zhang, Q., et al. Coalbed methane genesis, occurrence and accumulation in China. Petroleum Science, 2012, 9(3): 269-280.
Sosnowski, P., Jelonek, I. Facies development of coal seams in the Knurów deposit (Upper Silesia, Poland). International Journal of Coal Geology, 2022, 261: 104073.
Stroker, T. M., Harris, N. B., Crawford Elliott, W., et al. Diagenesis of a tight gas sand reservoir: Upper Cretaceous Mesaverde Group, Piceance Basin, Colorado. Marine and Petroleum Geology, 2013, 40: 48-68.
Tamamura, S., Murakami, T., Ueno, A., et al. Formation of coalbed methane and water-dissolved gas in Kushiro Coal Mine, Japan, based on isotopic compositions of gas, groundwater, and calcite. International Journal of Coal Geology, 2020, 229: 103577.
Tambaria, T. N., Sugai, Y., Nguele, R. Adsorption factors in enhanced coal bed methane recovery: A review. Gases, 2022, 2(1): 1-21.
Tian, F., Liang, Y., Wang, D., et al. Effects of caprock sealing capacities on coalbed methane preservation: Experimental investigation and case study. Journal of Central South University, 2019, 26: 925-937.
Tonnsen, R. R., Miskimins, J. L. Simulation of deep coalbed methane permeability and production assuming variable pore volume compressibility. Paper SPE 138160 Presented at SPE Canadian Unconventional Resources and International Petroleum Conference, Calgary, Alberta, Canada, 19-21 October, 2010.
Towler, B., Firouzi, M., Underschultz, J., et al. An overview of the coal seam gas developments in Queensland. Journal of Natural Gas Science and Engineering, 2016, 31: 249-271.
Ullah, B., Cheng, Y., Wang, L., et al. Experimental analysis of pore structure and fractal characteristics of soft and hard coals with same coalification. International Journal of Coal Science & Technology, 2022, 9(1): 58.
Underschultz, J. R., Pasini, P., Grigorescu, M., et al. Assessing aquitard hydraulic performance from hydrocarbon migration indicators: Surat and Bowen basins, Australia. Marine and Petroleum Geology, 2016, 78: 712-727.
Vasilenko, T., Kirillov, A., Islamov, A., et al. Permeability of a coal seam with respect to fractal features of pore space of fossil coals. Fuel, 2022, 329: 125113.
Wadsworth, J., Boyd, R., Diessel, C., et al. Stratigraphic style of coal and non-marine strata in a tectonically influenced intermediate accommodation setting; the Mannville Group of the Western Canadian Sedimentary Basin, south-central Alberta. Bulletin of Canadian Petroleum Geology, 2002, 50: 507-541.
Wang, Q., Ji, M., Liu, G., et al. Multi-field coupled mathematical modeling and numerical simulation technique of gas transport in deep coal seams. Advances in Geo-Energy Research, 2025, 15(1): 87-90.
Wang, T., Fan, W., Lin, H., et al. Micropore structure characteristics and gas-bearing properties of deep coal reservoirs: A case study of the Benxi Formation in the Daning-Jixian Block. Energy Geoscience, 2026, 7(5): 100581.
Wang, T., Tian, F., Deng, Z., et al. The characteristic development of micropores in deep coal and its relationship with adsorption capacity on the eastern margin of the Ordos Basin, China. Minerals, 2023, 13(3): 302.
Wang, T., Zhou, G., Fan, L., et al. Full-scale pore and microfracture characterization of deep coal reservoirs: A case study of the Benxi Formation coal in the Daning-Jixian Block, China. International Journal of Energy Research, 2024, 2024(1): 5772264.
Wang, Y., Yu, H., Jia, Z., et al. Transient pressure analysis of polymer flooding fractured wells with oil-water two-phase flow. Petroleum Exploration and Development, 2023, 50(1): 175-182.
Wang, Z., Liu, S., Qin, Y. Coal wettability in coalbed methane production: A critical review. Fuel, 2021, 303: 121277.
Wei, Q., Li, X., Zhang, J., et al. Full-size pore structure characterization of deep-buried coals and its impact on methane adsorption capacity: A case study of the Shihezi Formation coals from the Panji Deep Area in Huainan Coalfield, Southern North China. Journal of Petroleum Science and Engineering, 2019, 173: 975-989.
Welsby, D., Price, J., Pye, S., et al. Unextractable fossil fuels in a 1.5 °C world. Nature, 2021, 597: 230-234.
Wen, Z., Guo, S., Zhao, Y., et al. Mechanism of microscopic behind the influence of stress loading on gas adsorption by coal. Scientific Reports, 2025, 15(1): 3253.
Whelan, J. K., Farrington, J. W., Tarafa, M. E., et al. Maturity of organic matter and migration of hydrocarbons in two Alaskan North Slope wells. Organic Geochemistry, 1986, 10(1-3): 207-219.
Wood, J. M., Sanei, H. Secondary migration and leakage of methane from a major tight-gas system. Nature Communications, 2016, 7(1): 13614.
Wu, S., Tang, D., Li, S., et al. Coalbed methane adsorption behavior and its energy variation features under super-critical pressure and temperature conditions. Journal of Petroleum Science and Engineering, 2016, 146: 726-734.
Wu, X., Meng, Q., Zhu, H., et al. Adsorption-induced negative carbon isotope sequence in over-mature coal-type gas from the southwest Ordos Basin. Scientific Reports, 2025, 15(1): 12048.
Xiao, Z., Wang, G., Liu, J., et al. Experimental study and model improvement on coal permeability: The influence of effective stress, slip effect, and water content. International Journal of Rock Mechanics and Mining Sciences, 2025, 185: 105972.
Xu, F., Hou, W., Xiong, X., et al. The status and development strategy of coalbed methane industry in China. Petroleum Exploration and Development, 2023, 50(4): 765-783.
Yang, W., Bai, Y., Sun, X., et al. The influence of hydrocarbon generation on the sealing capability of mudstone caprock rich in organic matter. Scientific Reports, 2024, 14(1): 1846.
Yang, Y., Liu, S., Zhao, W., et al. Intrinsic relationship between Langmuir sorption volume and pressure for coal: Experimental and thermodynamic modeling study. Fuel, 2019, 241: 105-117.
Yang, Y., Xin, H., Zhang, P., et al. Study on the microscopic mechanism of competitive adsorption and swelling-diffusion effects of CO₂/CH₄ in coal under the influence of organic micromolecules. Chemical Engineering Science, 2026, 324: 123326.
Yan, T., He, S., Zheng, S., et al. Critical tectonic events and their geological controls on deep buried coalbed methane accumulation in Daning-Jixian Block, eastern Ordos Basin. Frontiers of Earth Science, 2023, 17(1): 197-217.
Yan, Y., Borhani, T. N., Subraveti, S. G., et al. Harnessing the power of machine learning for carbon capture, utilisation, and storage (CCUS) - A state-of-the-art review. Energy & Environmental Science, 2021, 14(12): 6122-6157.
Yao, W., Zhao, H., Li, P., et al. Stress-release-induced evolution of pore-fracture morphology and connectivity in deep coal seams: A case study of the Daning-Jixian block. Theoretical and Applied Mechanics Letters, 2026, 100697.
Zhang, B., Tao, S., Yang, F., et al. The genesis and accumulation mechanism of CBM in the typical mid- to low-rank coal-bearing basins. Petroleum Science, 2025, 22(8): 3069-3085.
Zhang, J., Li, G., Jia, C., et al. Natural gas types and coal-rock gas classification in the whole petroleum system of coal measures. Petroleum Exploration and Development, 2025, 52(4): 894-906.
Zhao, S., Wei, S., Zhang, L., et al. Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints. Scientific Reports, 2024, 14(1): 8659.
Zhao, Z., Xu, W., Zhao, Z., et al. Geological characteristics and exploration breakthroughs of coal rock gas in Carboniferous Benxi Formation, Ordos Basin, NW China. Petroleum Exploration and Development, 2024, 51(2): 262-278.
Zheng, G., Sun, B., Lv, D., et al. Study on reservoir properties and critical depth in deep coal seams in Qinshui Basin, China. Advances in Civil Engineering, 2019, 2019: 1683413.
Zhou, H., Rong, T., Wang, L., et al. A new anisotropic coal permeability model under the influence of stress, gas sorption and temperature: Development and verification. International Journal of Rock Mechanics and Mining Sciences, 2020, 132: 104407.
Zou, G., Zhang, Q., Peng, S., et al. Influence of geological factors on coal permeability in the Sihe coal mine. International Journal of Coal Science & Technology, 2022, 9(1): 6.
Zou, Y., Kang, Y., Chen, M., et al. Multiscale insights into CH₄/CO₂ desorption-diffusion under thermal-pressure-moisture coupling in deep coalbed methane nano-confined. Chemical Engineering Science, 2026, 320: 122506.
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Copyright (c) 2026 Sihao Li, Hang Li, Yong Tang, Yanpeng Chen; Jonathan Atuquaye Quaye; Chenlin Hu
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.