页岩中甲烷虚拟饱和蒸汽压的计算方法研究

doi:10.11885/j.issn.1674-5086.2015.03.05.07

摘要/Abstract

摘要：

甲烷在页岩中的吸附属于物理吸附，同时甲烷在页岩储层中呈超临界状态吸附。引入过剩吸附量，对吸附实
验中吸附气量进行修正，并对Dubinin Astakhov（D A）方程进行改进，将改进后方程应用于研究页岩中超临界甲烷的
吸附特征曲线，并对虚拟饱和蒸汽压计算经验公式进行优选。研究结果表明：Dubinin 方法和Reid 方法计算虚拟饱和
蒸汽压偏低，Antoine 方程外推方法和Astakhov 方法计算虚拟饱和蒸汽压偏高；Amankwah 方法是计算虚拟饱和蒸汽
压的最优方法。页岩中超临界甲烷吸附特征曲线与温度无关，且得到具有物理意义参数的吸附特征曲线表达式。

关键词: 页岩, 甲烷, Dubinin Astakhov 模型, 虚拟饱和蒸汽压, 吸附特征曲线

Abstract:

Adsorption of methane on shale is physical adsorption，and methane in supercritical state exists in the shale reservoir.
We introduced a concept of excess adsorption amount to modify adsorption gas volume of the adsorption experiment and
improved the Dubinin Astakhov（D A）equation，which is used to investigate the adsorption characteristics curve of supercritical
methane on shales，and the empirical formula of pseudo-saturation vapor pressure calculation was also investigated. The
result shows that the pseudo-saturation vapor pressure calculated by the Dubinin method and Reid method was lower and the
pseudo-saturation vapor pressure calculated by the extrapolation Antoine equation method and Astakhov method was higher.
The Amankwah method was an optimal method to calculate the pseudo-saturation vapor pressure. The adsorption characteristics
curve of supercritical methane on shales is independent of temperature，and the mathematical expression of adsorption
characteristics curve with physical parameters is described by the improved Dubinin-Astakhov equation.

Key words: shale, CH4, Dubinin Astakhov model, pseudo-saturation vapor pressure, adsorption characteristics curve

熊健*，刘向君，梁利喜. 页岩中甲烷虚拟饱和蒸汽压的计算方法研究[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2015.03.05.07.

Xiong Jian*, Liu Xiangjun, Liang Lixi. Study on the Pseudo-saturation Vapor Pressure of the Methane on Shales[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2015.03.05.07.

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