Methane Adsorption on Shale under Simulated Geological Temperature and Pressure Conditions

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• 作者：Thomas F. T. Rexer ; Michael J. Benham ; Andrew C. Aplin ; K. Mark Thomas
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：June 20, 2013
• 年：2013
• 卷：27
• 期：6
• 页码：3099-3109
• 全文大小：601K
• 年卷期：v.27,no.6(June 20, 2013)
• ISSN：1520-5029

文摘

Shale gas is becoming an increasingly important energy resource. In this study, the adsorption of methane on a dry, organic-rich Alum shale sample was studied at pressures up to 14 MPa and temperatures in the range 300鈥?73 K, which are relevant to gas storage under geological conditions. Maximum methane excess uptake was 0.176鈥?.042 mmol g^鈥? (125鈥?0 scf t^鈥?) for the temperature range of 300鈥?73 K. The decrease in maximum methane surface excess with increasing temperature can be described with a linear model. An isosteric enthalpy of adsorption 19.2 卤 0.1 kJ mol^鈥? was determined at 0.025 mmol g^鈥? using the van鈥檛 Hoff equation. Supercritical adsorption was modeled using the modified Dubinin鈥揜adushkevich and the Langmuir equations. The results are compared with absolute isotherms calculated from surface excess and the pore volumes obtained from subcritical gas adsorption (nitrogen (78 K), carbon dioxide (273 and 195 K), and CH₄ (112 K)). The subcritical adsorption and the surface excess results allow an upper limit to be put on the amount of gas that can be retained by adsorption during gas generation from petroleum source rocks.