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Measurement and modeling of the adsorption isotherms of CH4 and C2H6 on shale samples

机译：页岩样品上CH4和C2H6吸附等温线的测量和建模

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CH _(4) and C _(2) H _(6) are two common components in shale gas. Adsorption isotherms of CH _(4) , C _(2) H _(6) , and their binary mixtures on shale samples are significant for understanding the fundamental mechanisms of shale gas storage and the recovery of shale resources from shale reservoirs. In this study, the thermogravimetric method is applied to obtain the adsorption isotherms of CH _(4) , C _(2) H _(6) and their binary mixtures on two typical shale core samples. A simplified local density theory/Peng–Robinson equation of state (SLD-PR EOS) model is then applied to calculate the adsorption of CH _(4) and C _(2) H _(6) on shale, and the efficiency of the SLD-PR EOS model is thus evaluated. The results show that C _(2) H _(6) exhibits a higher adsorption capacity than CH _(4) on shale samples, indicating the greater affinity of C _(2) H _(6) to organic shale. As the molar fraction of C _(2) H _(6) increases in the CH _(4) /C _(2) H _(6) mixtures, the adsorption capacity of the gas mixtures increases, indicating the preferential adsorption of C _(2) H _(6) on shale. Based on the predicted results from the SLD-PR EOS model, a reasonable agreement has been achieved with the measured adsorption isotherms of CH _(4) and C _(2) H _(6) , validating the reliability of the SLD-PR EOS model for predicting adsorption isotherms of CH _(4) and C _(2) H _(6) on shale samples. In addition, the SLD-PR EOS model is more accurate in predicting the adsorption of CH _(4) on shale than that of C _(2) H _(6) . This study is expected to inspire a new strategy for predicting the adsorption of hydrocarbons on shale and to provide a basic understanding of competitive adsorption of gas mixtures in shale reservoirs.
机译：CH _（4）和C _（2）H _（6）是页岩气中的两个常见成分。 CH _（4），C _（2）H _（6）及其二元混合物在页岩样品上的吸附等温线对于理解页岩气储藏的基本机理和从页岩储层中回收页岩资源具有重要意义。在这项研究中，采用热重法获得CH _（4），C _（2）H _（6）及其二元混合物在两个典型页岩岩心样品上的吸附等温线。然后应用简化的局部密度理论/ Peng-Robinson状态方程（SLD-PR EOS）模型来计算CH _（4）和C _（2）H _（6）在页岩上的吸附以及吸附效率。这样就评估了SLD-PR EOS模型。结果表明，C _（2）H _（6）在页岩样品上的吸附能力高于CH _（4），表明C _（2）H _（6）对有机页岩的亲和力更大。随着CH _（4）/ C _（2）H _（6）混合物中C _（2）H _（6）的摩尔分数增加，气体混合物的吸附容量增加，这表明对页岩上的C _（2）H _（6）。根据SLD-PR EOS模型的预测结果，已测量的CH _（4）和C _（2）H _（6）的吸附等温线已达成合理的一致，验证了SLD-PR的可靠性EOS模型，用于预测页岩样品上CH _（4）和C _（2）H _（6）的吸附等温线。此外，SLD-PR EOS模型在预测CH _（4）在页岩上的吸附比C _（2）H _（6）更准确。这项研究有望激发一种预测页岩中碳氢化合物吸附的新策略，并为页岩储层中气体混合物的竞争性吸附提供基本理解。

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