页岩气超临界吸附的Dubibin-Astakhov改进模型

被引：69

作者：

熊健

刘向君

梁利喜

雷梦

机构：

[1] 西南石油大学油气藏地质及开发工程国家重点实验室

来源：

石油学报 | 2015年 / 36卷 / 07期

关键词：

页岩; 甲烷; 超临界吸附; Dubinin-Astakhov模型; 改进Amankwah方法;

D O I：

暂无

中图分类号：

P618.13 [石油、天然气];

学科分类号：

070403 [天体物理学];

摘要：

甲烷在页岩上的吸附属于物理吸附,且属于超临界吸附。利用Gibbs公式将过剩吸附量转换为绝对吸附量,将Dubibin-Astakhov(D-A)吸附模型和吸附特征曲线结合,研究了页岩中超临界甲烷的吸附机理。研究结果表明:D-A方程不能直接应用于页岩中甲烷吸附机理的研究,因为其得到的吸附特征能是温度的函数,与吸附势理论相违背;D-A吸附模型和吸附特征曲线结合,推导出了改进的D-A吸附模型,其中虚拟饱和蒸汽压的计算采用改进的Dubinin公式,同时利用提出的改进Amankwah方法求取最优k值;改进的D-A吸附模型能够预测页岩中甲烷的吸附等温线,且其精度较高,能够预测页岩储层不同温度、压力下甲烷在页岩中的吸附量,并可以用于页岩气资源评价。

引用

页码：849 / 857

页数：9

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