页岩气在矿物孔隙中的微观吸附机理差异性研究

doi:10.3969/j.issn.1006-6535.2020.04.012

特种油气藏 ›› 2020, Vol. 27 ›› Issue (4): 79-84.DOI: 10.3969/j.issn.1006-6535.2020.04.012

页岩气在矿物孔隙中的微观吸附机理差异性研究

许晨曦^1,2, 薛海涛¹, 李波宏³, 卢双舫¹, 张剑⁴, 陈国辉^1,5, 王帅¹

1.水利勘测设计研究院,山东济南 250014;
2.中国石油大学(华东),山东青岛 266580;
3.中国石油集团测井有限公司,陕西西安 710000;
4.湖北省地质局,湖北孝感 432000;
5.中国地质大学(武汉),湖北武汉 430074

收稿日期:2019-11-26 修回日期:2020-04-15 出版日期:2020-08-25 发布日期:2022-02-18
作者简介:许晨曦(1991—),女,工程师,2015年毕业于山东科技大学地质工程专业,2019年毕业于中国石油大学(华东)地质资源与地质工程专业,获硕士学位,现从事工程地质方面的工作。
基金资助:
国家自然科学基金“气体扩散、渗流过程中同位素分馏机理及定量表征研究”(41802157);国家自然基金面上项目 “页岩气解析过程中同位素分馏的定量表征及在页岩气关键评价参数确定中的应用”(41672130)

Microscopic Adsorption Mechanism Difference in the Mineral Pore of Shale Gas Reservoir

Xu Chenxi^1,2, Xue Haitao¹, Li Bohong³, Lu Shuangfang¹, Zhang Jian⁴, Chen Guohui^1,5, Wang Shuai¹

1. Water Conservancy Survey and Design Institute,Jinan,Shandong 250014, China;
2. China University of Petroleum (East China), Qingdao, Shandong 266580, China;
3. China Petroleum Logging Co. Ltd.,Xi'an, Shaanxi 710000, China;
4. Hubei Geological Bureau, Xiaogan, Hubei 432000, China;
5. China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China

Received:2019-11-26 Revised:2020-04-15 Online:2020-08-25 Published:2022-02-18

摘要/Abstract

摘要： 针对页岩气在不同矿物孔隙中的吸附机理差异性,采用巨正则蒙特卡洛分子模拟方法(GCMC),利用Material Studio 软件模拟页岩气体在3种矿物(干酪根、黏土矿物、石英)孔隙模型中的赋存状态,研究页岩气在不同矿物孔隙中的吸附机理。结果表明:不同类型矿物的吸附能力按大小依次为干酪根、黏土矿物、石英;有机质、黏土矿物和碎屑矿物吸附能力产生巨大差异的主要原因是气体在不同矿物表面的吸附位特征(吸附质气体分布密度和吸附强度)显著不同;深入理解页岩气在不同矿物孔隙中的吸附机理差异对客观评价吸附气含量至关重要。该研究可为今后预测不同地区页岩气吸附能力提供理论基础。

关键词: 页岩气矿物孔隙, 吸附机理, 表面结构, 结合能, 吸附位

Abstract: The giant regular Monte Carlo molecular simulation method (GCMC) was used to study the microscopic adsorption mechanism difference for the shale gas in different mineral pores. Material Studio software was adopted to simulate the occurrences of shale gas in three mineral pore categories (kerogen, clay mineral, quartz) and explore the adsorption mechanism of shale gas in different mineral pore categories. Research indicates that the mineral adsorption capacity from high to low is kerogen, clay mineral and quartz. The great differences in adsorption capacity for organic matter, clay mineral and clastic mineral mainly result from the change of adsorption site (distribution density and adsorption intensity of adsorbate gas) on various mineral surfaces. An integral understanding of the adsorption mechanism differences for the shale gas in various mineral pore categories is favorable to the adsorbed gas content evaluation. This research could provide certain theoretical reference for the prediction of shale gas adsorption capacity in different regions.

Key words: mineral pore in shale gas reservoir, adsorption mechanism, surface structure, binding energy, adsorption potential

中图分类号:

TE122.1

许晨曦, 薛海涛, 李波宏, 卢双舫, 张剑, 陈国辉, 王帅. 页岩气在矿物孔隙中的微观吸附机理差异性研究[J]. 特种油气藏, 2020, 27(4): 79-84.

Xu Chenxi, Xue Haitao, Li Bohong, Lu Shuangfang, Zhang Jian, Chen Guohui, Wang Shuai. Microscopic Adsorption Mechanism Difference in the Mineral Pore of Shale Gas Reservoir[J]. Special Oil & Gas Reservoirs, 2020, 27(4): 79-84.

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页岩气在矿物孔隙中的微观吸附机理差异性研究

Microscopic Adsorption Mechanism Difference in the Mineral Pore of Shale Gas Reservoir

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