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Methane Adsorption Equilibrium on Marine Gas-Bearing Shale Matrices: The Polanyi Potential Theory Approach
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-05-01 , DOI: 10.1021/acs.iecr.2c04416 Xing Tang 1 , Xuewei Cai 1 , Yi Xu 1 , Dengfeng Zhang 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-05-01 , DOI: 10.1021/acs.iecr.2c04416 Xing Tang 1 , Xuewei Cai 1 , Yi Xu 1 , Dengfeng Zhang 1
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To reveal the feasibility of the Polanyi potential theory toward methane (CH4) adsorption equilibrium on marine gas-bearing shale matrices, a quantitative analysis method was proposed to elaborate adsorption mechanisms on CH4–shale systems based on CH4 adsorption data. Additionally, the potential theory was employed to generate CH4 adsorption isotherms on shale matrices at a given temperature and further distinguish organic matter and clay mineral dependences of CH4 adsorption. Ultimately, the potential theory was used to plot the curves of CH4 adsorption capacity versus various burial depths of shale reservoirs. Results indicate that CH4 adsorption on marine gas-bearing shale matrices typically follows micropore filling. Hence, the supercritical Dubinin–Astakhov (D–A) model derived from the potential theory is capable of describing CH4 adsorption equilibrium on shale matrices. The adsorption characteristic curve via combining the Polanyi potential theory and the supercritical D–A model well coincides within the entire adsorption temperature range. Therefore, the adsorption characteristic curve is competent to predict CH4 adsorption isotherms at a given temperature. Moreover, the Polanyi potential theory approach suggests that the organic matter content of shale matrices shows a slightly positive correlation with its adsorption capability for CH4. The clay minerals exert a minor impact on the CH4 adsorption capability of the shale matrices with high organic matter contents. Instead, the contribution of clay minerals to the shale matrices with low TOC cannot be neglected. Finally, the potential theory is capable of plotting the variation curves of the CH4 adsorption capacity versus burial depth. The Polanyi potential theory can well estimate the CH4 adsorption capability of shale matrices with various burial depths, thereby benefiting shale gas assessment and production.
中文翻译：
海洋含气页岩基质上的甲烷吸附平衡：Polanyi 势理论方法
为了揭示 Polanyi 势理论对海相含气页岩基质上甲烷 (CH 4 ) 吸附平衡的可行性，提出了一种基于 CH 4 吸附数据的定量分析方法来阐述 CH 4 -页岩系统的吸附机制。此外，还采用势理论在给定温度下在页岩基质上生成 CH 4吸附等温线，并进一步区分 CH 4吸附对有机质和粘土矿物的依赖性。最终利用位势理论绘制出CH 4吸附量随页岩储层不同埋深变化的曲线。结果表明，CH 4海洋含气页岩基质上的吸附通常在微孔填充之后进行。因此，源自势理论的超临界 Dubinin-Astakhov (D-A) 模型能够描述 CH 4在页岩基质上的吸附平衡。结合Polanyi势理论和超临界D-A模型得到的吸附特性曲线在整个吸附温度范围内吻合良好。因此，吸附特性曲线能够预测给定温度下的CH 4吸附等温线。此外，Polanyi 势理论方法表明，页岩基质的有机质含量与其对 CH 4的吸附能力略呈正相关. 粘土矿物对有机质含量高的页岩基质的CH 4吸附能力影响较小。相反，粘土矿物对低 TOC 页岩基质的贡献不容忽视。最后，势理论能够绘制CH 4吸附量随埋深的变化曲线。Polanyi势理论可以很好地估算不同埋深页岩基质对CH 4的吸附能力，从而有利于页岩气评价和生产。
更新日期：2023-05-01
中文翻译：
海洋含气页岩基质上的甲烷吸附平衡：Polanyi 势理论方法
为了揭示 Polanyi 势理论对海相含气页岩基质上甲烷 (CH 4 ) 吸附平衡的可行性，提出了一种基于 CH 4 吸附数据的定量分析方法来阐述 CH 4 -页岩系统的吸附机制。此外，还采用势理论在给定温度下在页岩基质上生成 CH 4吸附等温线，并进一步区分 CH 4吸附对有机质和粘土矿物的依赖性。最终利用位势理论绘制出CH 4吸附量随页岩储层不同埋深变化的曲线。结果表明，CH 4海洋含气页岩基质上的吸附通常在微孔填充之后进行。因此，源自势理论的超临界 Dubinin-Astakhov (D-A) 模型能够描述 CH 4在页岩基质上的吸附平衡。结合Polanyi势理论和超临界D-A模型得到的吸附特性曲线在整个吸附温度范围内吻合良好。因此，吸附特性曲线能够预测给定温度下的CH 4吸附等温线。此外，Polanyi 势理论方法表明，页岩基质的有机质含量与其对 CH 4的吸附能力略呈正相关. 粘土矿物对有机质含量高的页岩基质的CH 4吸附能力影响较小。相反，粘土矿物对低 TOC 页岩基质的贡献不容忽视。最后，势理论能够绘制CH 4吸附量随埋深的变化曲线。Polanyi势理论可以很好地估算不同埋深页岩基质对CH 4的吸附能力，从而有利于页岩气评价和生产。
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