Abstract
Given the potential of shale gas as an energy source, exploration and development efforts have been underway around the world. To better understand the adsorption mechanism of the Lower Cambrian Niutitang Formation shale in the northern Guizhou region, China, core samples were obtained from two potential gas reservoirs in the region. Petrophysical and adsorption experiments were performed on these samples. The thermodynamic characteristics of shale adsorption are discussed based on the surface free energy and isostatic heat of adsorption. The effect of adsorption on gas flow in shale pore fractures is discussed. The results point to the promising potential of the exploration and development of the Niutitang Formation shale. The adsorption capacity of the shale decreases as the temperature increases. As the pressure increases, the adsorption capacity first increases and then decreases. The temperature, pressure, and shale-specific surface area all affect the surface free energy of the shale, which in turn affects the shale adsorption capacity of CH4. This change in the gas adsorption capacity is consistent with the trend exhibited by the surface free energy. Therefore, the adsorption of shale is controlled by its surface free energy. The isothermal adsorption of shale displays a positive correlation with the isosteric heat of adsorption. The average isosteric heat of FC1 shale is 28.68 kJ/mol; this shale only physically adsorbs methane. The average isosteric heat of TM1 shale is 42.90 kJ/mol. Physical adsorption may be accompanied by chemical adsorption. The isothermal adsorption curves at different temperatures can be predicted by the isosteric heat of adsorption. The gas adsorption layer affects the gas flow regimes by changing the effective pore size of the shale. The methodologies and results presented herein will be beneficial to more accurately understanding the storage mechanism of shale gas and estimating the scale of shale gas resources.
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The authors thank the anonymous reviewers and editors for their valuable comments and suggestions for improving this manuscript.
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This work was supported by the National Natural Science Foundation of China ((Grant No. 51874107), the Major Applied Basic Research Project of Guizhou Province (Grant No. JZ2014-2005), the Science and Technology Funding Projects of Guizhou Province (Grant No. 2018-5781), and the Department of Education Funding Project of Guizhou Province (Grant No. KY2013-112).
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Li, X., Chen, L., Pei, P. et al. Shale adsorption characteristics of the Lower Cambrian Niutitang Formation in northern Guizhou based on surface free energy and isosteric heat data. Arab J Geosci 13, 1217 (2020). https://doi.org/10.1007/s12517-020-06158-0
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DOI: https://doi.org/10.1007/s12517-020-06158-0