基于逸度与压力计算页岩吸附甲烷的等量吸附热差异分析——以延长探区延长组页岩为例

doi:10.12108/yxyqc.20210218

岩性油气藏 ›› 2021, Vol. 33 ›› Issue (2): 171–179.doi: 10.12108/yxyqc.20210218

基于逸度与压力计算页岩吸附甲烷的等量吸附热差异分析——以延长探区延长组页岩为例

薛培^1,2, 张丽霞², 梁全胜², 师毅³

1. 西北政法大学, 西安 710063;
2. 陕西延长石油 (集团) 有限责任公司研究院, 西安 710075;
3. 延长石油集团油气勘探公司, 陕西延安 716000

收稿日期:2020-04-18 修回日期:2020-06-05 出版日期:2021-04-01 发布日期:2021-03-31
第一作者:薛培(1987—),男,博士,高级工程师,主要从事非常规油气开发与油气投资风险管理研究。地址:(710075)陕西省西安市雁塔区唐延路61号延长科研中心。Email:gwl330@163.com
通信作者: 张丽霞(1962—),女,教授级高级工程师,主要从事油气勘探开发方面的研究工作。Email:309907081@qq.com。
基金资助:
国家科技重大专项“延安地区陆相页岩气勘探开发关键技术”（编号：2017ZX05039001005）和延长石油青年基金项目“超临界CO₂置换页岩气机理研究”（编号：ycsy2020qnjj-B-06）联合资助

Difference analysis of isosteric heat of methane adsorption on shale based on fugacity and pressure: a case study of Yanchang Formation in Yanchang exploration area

XUE Pei^1,2, ZHANG Lixia², LIANG Quansheng², SHI Yi³

1. Northwest University of Political Science and Law, Xi'an 710063, China;
2. Research Institute, Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an 710075, China;
3. Yanchang Petroleum Group Exploration Company, Yan'an 716000, Shaanxi, China

Received:2020-04-18 Revised:2020-06-05 Online:2021-04-01 Published:2021-03-31

摘要/Abstract

摘要： 为了完善吸附热力学参数的计算方法，明确陆相页岩吸附CH₄的热力学特征，以延长探区延长组页岩为研究对象，开展了不同温度下页岩吸附CH₄的等温吸附实验，并利用绝对吸附量曲线对比分析了基于逸度-绝对吸附量与压力-绝对吸附量的等量吸附热的差异。结果表明：①逸度小于压力，在低压力区间（0.36~2.21 MPa）内，逸度与压力的差值较小，随着温度降低和压力升高，逸度与压力的差值增加。②基于逸度与压力获得的等量吸附热曲线均具有明显的单调递增的线性特征，但采用压力-绝对吸附量获得的等量吸附热曲线斜率大于采用逸度-绝对吸附量获得的等量吸附热曲线，这表明基于压力-绝对吸附量获得的等量吸附热计算结果中吸附质分子间作用力的影响过大。③绝对吸附量为0.01~0.35 mmol/g，基于逸度-绝对吸附量与压力-绝对吸附量获得的等量吸附热的相对偏差为-86.54%~57.01%，页岩气吸附体系的热力学评价应当采用逸度-绝对吸附量数据作为等量吸附热计算的基础数据。

关键词: Clasius-Clayperon方程, 逸度, 等量吸附热, 页岩, 延长组

Abstract: In order to improve the calculation method of isosteric heat of adsorption,clarify the thermodynamic characteristics of adsorption of CH₄ by continental shale and reveal its adsorption mechanism,shale samples from Yanchang Formation in Yanchang exploration area were selected to carry out isothermal adsorption experiment of CH₄ adsorption on shale at different temperatures,and the difference of isosteric heat of adsorption based on fugacity-absolute adsorption capacity and pressure-absolute adsorption capacity was analyzed by using absolute adsorption capacity curve. The results show that:(1) Fugacity is less than pressure,and in the pressure range of 0.36-2.21 MPa,the difference between fugacity and pressure is small. With the temperature decreasing and the pressure increasing,the difference increases.(2) The isotherm curves based on fugacity and pressure have obvious monotonic increasing linear characteristics,but the slope of isosteric heat of adsorption curve obtained by pressure-absolute adsorption capacity is larger than that obtained by fugacity-absolute adsorption capacity,which indicates that the intermolecular force of adsorbate has a great influence on the calculation results of isosteric heat of adsorption based on pressure-absolute adsorption capacity.(3) In the absolute adsorption capacity range of 0.01-0.35 mmol/g,the relative deviation of isosteric heat of adsorption obtained based on fugacity-absolute adsorption capacity and pressure-absolute adsorption capacity is -86.54%-57.01%. The data of fugacityabsolute adsorption capacity should be used as the basic data for the calculation of isosteric heart of adsorption in the thermodynamic evaluation of shale gas adsorption system.

Key words: Clasius-Clayperon equation, fugacity, isosteric heat of adsorption, shale, Yanchang Formation

中图分类号:

P618.11

薛培, 张丽霞, 梁全胜, 师毅. 基于逸度与压力计算页岩吸附甲烷的等量吸附热差异分析——以延长探区延长组页岩为例[J]. 岩性油气藏, 2021, 33(2): 171–179.

XUE Pei, ZHANG Lixia, LIANG Quansheng, SHI Yi. Difference analysis of isosteric heat of methane adsorption on shale based on fugacity and pressure: a case study of Yanchang Formation in Yanchang exploration area[J]. Lithologic Reservoirs, 2021, 33(2): 171–179.

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基于逸度与压力计算页岩吸附甲烷的等量吸附热差异分析——以延长探区延长组页岩为例

Difference analysis of isosteric heat of methane adsorption on shale based on fugacity and pressure: a case study of Yanchang Formation in Yanchang exploration area

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