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Methane Diffusion and Adsorption in Shale Rocks: A Numerical Study Using the Dusty Gas Model in TOUGH2/EOS7C-ECBM
Shen WJ(沈伟军); Zheng LG; Oldenburg CM; Cihan A; Wan JM; Tokunaga TK
Source PublicationTransport in Porous Media

Gas production from shale gas reservoirs plays a significant role in satisfying increasing energy demands. Compared with conventional sandstone and carbonate reservoirs, shale gas reservoirs are characterized by extremely low porosity, ultra-low permeability and high clay content. Slip flow, diffusion, adsorption and desorption are the primary gas transport processes in shale matrix, while Darcy flow is restricted to fractures. Understanding methane diffusion and adsorption, and gas flow and equilibrium in the low-permeability matrix of shale is crucial for shale formation evaluation and for predicting gas production. Modeling of diffusion in low-permeability shale rocks requires use of the Dusty gas model (DGM) rather than Fick's law. The DGM is incorporated in the TOUGH2 module EOS7C-ECBM, a modified version of EOS7C that simulates multicomponent gas mixture transport in porous media. Also included in EOS7C-ECBM is the extended Langmuir model for adsorption and desorption of gases. In this study, a column shale model was constructed to simulate methane diffusion and adsorption through shale rocks. The process of binary diffusion and adsorption was analyzed. A sensitivity study was performed to investigate the effects of pressure, temperature and permeability on diffusion and adsorption in shale rocks. The results show that methane gas diffusion and adsorption in shale is a slow process of dynamic equilibrium, which can be illustrated by the slope of a curve in mass variation. The amount of adsorption increases with the pressure increase at the low pressure, and the mass change by gas diffusion will decrease due to the decrease in the compressibility factor of the gas. With the elevated temperature, the gas molecules move faster and then the greater gas diffusion rates make the process duration shorter. The gas diffusion rate decreases with the permeability decrease, and there is a limit of gas diffusion if the permeability is less than . The results can provide insights for a better understanding of methane diffusion and adsorption in the shale rocks so as to optimize gas production performance of shale gas reservoirs.

KeywordShale Gas Reservoirs Methane Diffusion Adsorption Dusty Gas Model Tough2
Subject AreaEngineering, Chemical
Indexed BySCI ; EI ; CPCI-S
WOS IDWOS:000434910500005
Funding OrganizationNational Energy Technology Laboratory under U.S. Department of Energy(ESD14085) ; National Science and Technology Major Project of the Ministry of Science and Technology of China Project(50150503-12 ; Project of PetroChina Research Institute of Petroleum Exploration and Development(RIPED-LFFY-2017-JS-118) ; Foundation of China Scholarship Council ; Youth Foundation of Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Chinese Academy of Sciences ; 2016ZX05037006)
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Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorShen WJ(沈伟军)
Affiliation1.Institute of Mechanics, Chinese Academy of Sciences
2.Energy Geosciences Division, Lawrence Berkeley National Laboratory
Recommended Citation
GB/T 7714
Shen WJ,Zheng LG,Oldenburg CM,et al. Methane Diffusion and Adsorption in Shale Rocks: A Numerical Study Using the Dusty Gas Model in TOUGH2/EOS7C-ECBM[J]. Transport in Porous Media,2018,123(3):521-531.
APA Shen WJ,Zheng LG,Oldenburg CM,Cihan A,Wan JM,&Tokunaga TK.(2018).Methane Diffusion and Adsorption in Shale Rocks: A Numerical Study Using the Dusty Gas Model in TOUGH2/EOS7C-ECBM.Transport in Porous Media,123(3),521-531.
MLA Shen WJ,et al."Methane Diffusion and Adsorption in Shale Rocks: A Numerical Study Using the Dusty Gas Model in TOUGH2/EOS7C-ECBM".Transport in Porous Media 123.3(2018):521-531.
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