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Overestimation of pore volume in high-TOC shales by low-temperature nitrogen adsorption: Phenomenon and cause analysis

文献类型：期刊论文

作者Jiang WB(江文滨)6,7; Zhu, Di5; Luo, Chao3,4; Cao GH(曹高辉)7; Ji LL(姬莉莉)6,7; Lin M(林缅)6,7; Chen Z(陈卓)2,6,7; Dou WC(窦文超)7; Zhong, Kesu3,4; Jia ZH(贾占贺)6,7
刊名CHEMICAL ENGINEERING JOURNAL
出版日期2025-02-01
卷号505页码:14
关键词Shale gas Low-temperature nitrogen adsorption Helium expansion Organic content Thermal expansion
ISSN号1385-8947
DOI10.1016/j.cej.2025.159695
通讯作者Zhu, Di(d_zhu@guande-tech.com) ; Cao, Gaohui(caogaohui@imech.ac.cn)
英文摘要Marine shales exhibit pore structures spanning multiple scales, from nanometers to micrometers, necessitating a combination of various methods for comprehensive characterization. Helium expansion (HE) and lowtemperature nitrogen adsorption (LTNA) are commonly used in the industry. In this study, an anomalous phenomenon is observed that a considerable number of samples exhibit pore volume (PV) characterized by LTNA exceed that characterized by HE, which should be larger. The causes of these anomalies are not fully understood. A comparative study of the characterization results from these two methods is conducted on shale samples from the Wufeng and Longmaxi Formations in Well R8 in southern Sichuan Basin. First, the influence of sample size and sample weight on the LTNA-characterized PV is clarified to further confirm the objective existence of the anomalies. Subsequently, by comparing results from the two methods for samples with the same particle size, it is revealed that a strong correlation exists between the relative difference in the characterized PVs and the organic matter content. For high-TOC (Total Organic Content) shales, the LTNA-characterized PV approached or even exceeded that characterized by HE. Through the analysis of linear thermal expansion coefficients, the obtained result of organic matter falls within the range from previous researches, indicating that the skeleton of organic matter undergoes more significant shrinkage than inorganic minerals at liquid nitrogen temperature. This should be the primary reason for the overestimation of PVs characterized by LTNA in high-TOC shales. The findings can help refine characterization techniques, and enhance the accuracy of reservoir evaluations.
分类号一类
WOS关键词SOUTHERN SICHUAN BASIN ; THERMAL-EXPANSION ; LONGMAXI FORMATION ; GAS ; COMBINATION ; POROSIMETRY ; RESERVOIRS ; CHINA ; SIZE
资助项目National Natural Science Foundation of China[41690132] ; National Natural Science Foundation of China[42030808] ; Project of Chinese Academy of Sciences[GJ04010303] ; PetroChina Science and Technology Major Project[2019F-31-01]
WOS研究方向Engineering
语种英语
WOS记录号WOS:001405476700001
资助机构National Natural Science Foundation of China ; Project of Chinese Academy of Sciences ; PetroChina Science and Technology Major Project
其他责任者Zhu, Di ; Cao, Gaohui
源URL[http://dspace.imech.ac.cn/handle/311007/98246]  
专题力学研究所_流固耦合系统力学重点实验室(2012-)
作者单位1.China Univ Petr, Sch Geosci, Qingdao 266580, Shandong, Peoples R China
2.PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China;
3.PetroChina Southwest Oil & Gasfield Co, Shale Gas Res Inst, Chengdu 610051, Sichuan, Peoples R China;
4.PetroChina Southwest Oil & Gasfield Co, Chengdu 610051, Sichuan, Peoples R China;
5.Nanjing Univ, Sch Sustainable Energy & Resources, Suzhou 215163, Peoples R China;
6.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100190, Peoples R China;
7.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China;
推荐引用方式
GB/T 7714		 Jiang WB,Zhu, Di,Luo, Chao,et al. Overestimation of pore volume in high-TOC shales by low-temperature nitrogen adsorption: Phenomenon and cause analysis[J]. CHEMICAL ENGINEERING JOURNAL,2025,505:14.
APA 江文滨.,Zhu, Di.,Luo, Chao.,曹高辉.,姬莉莉.,...&Hao, Fang.(2025).Overestimation of pore volume in high-TOC shales by low-temperature nitrogen adsorption: Phenomenon and cause analysis.CHEMICAL ENGINEERING JOURNAL,505,14.
MLA 江文滨,et al."Overestimation of pore volume in high-TOC shales by low-temperature nitrogen adsorption: Phenomenon and cause analysis".CHEMICAL ENGINEERING JOURNAL 505(2025):14.

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来源：力学研究所

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