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Evolution of mechanical properties of kerogen with thermal maturity

文献类型：期刊论文

作者Wang, Jianfeng4,5,6; Liu, Yuke3; Yang, Chao2; Jiang, Wenmin1,5,6; Li, Yun1,5,6; Xiong, Yongqiang5,6; Peng, Ping 'an5,6
刊名MARINE AND PETROLEUM GEOLOGY
出版日期2022-11-01
卷号145页码:17
关键词Kerogen Chemical structure Young's modulus Hardness Thermal evolution
ISSN号0264-8172
DOI10.1016/j.marpetgeo.2022.105906
通讯作者Jiang, Wenmin(jiangwm@gig.ac.cn) ; Li, Yun(liyun@gig.ac.cn)
英文摘要Kerogen is the most abundant form of naturally occurring organic matter in organic-rich shale, and it can affect the macro-mechanical characteristics of shale reservoirs during the whole shale thermal evolution process. However, the magnitude and mechanism of this effect are not clear. Here, a relatively low-maturity kerogen isolated from an organic-rich shale was used to prepare a series of kerogen samples of different maturities in an artificial pyrolysis experiment. Raman spectroscopy and solid-state C-13 nuclear magnetic resonance (NMR) spectroscopy were used to determine changes in the chemical structures of the kerogen samples, and in situ nanoindentation analysis was employed to characterize the evolution of their mechanical properties. Raman spectral analyses indicate that Raman band separation (RBS) is very sensitive to thermal maturity, increasing with maturity and displaying a strong linear correlation with mechanical properties of kerogen such as hardness and Young's modulus. Based on the solid-state C-13 NMR and nanoindentation analysis, the evolution of kerogen mechanical properties with maturity can be divided into two stages: oil-generation wet-gas stage (corresponding to 0.7%-2.5% EasyRo), and dry-gas stage (2.5%-4.5% EasyRo). In the former, kerogen exhibits a soft nature with relatively low hardness and Young's modulus, possibly attributable to its relatively large proportion of aliphatic carbon and long-chain alkanes. When maturity reaches the gas stage, kerogen becomes increasingly stiff due to the markedly increased proportion of aromatic and bridgehead carbon. Considering the strong positive correlation between mechanical parameters and chemical-structure parameters (RBS, and aromatic and bridgehead carbon ratios) of kerogen during the overall thermal evolution process, we suggest that the stiffening of kerogen may result from the decreasing content of aliphatic chains and increasing aromatic carbon. This study will be beneficial to the development of rock mechanical models that are critical for accurately evaluating borehole stability and optimizing hydraulic fracture design.
WOS关键词ORGANIC-MATTER ; ELASTIC-MODULUS ; II KEROGEN ; C-13 NMR ; INSTRUMENTED INDENTATION ; MACROMOLECULAR STRUCTURE ; CARBONACEOUS MATERIALS ; CHEMICAL-STRUCTURE ; OIL-SHALE ; MATURATION
资助项目Chinese Academy of Sciences[XDA14010102] ; National Natural Science Foundation of China[41902129] ; National Natural Science Foundation of China[41802165] ; National Natural Science Foundation of China[42002158] ; State Key Laboratory of Organic Geochemistry, GIGCAS[SKLOG202012]
WOS研究方向Geology
语种英语
WOS记录号WOS:000862269900001
出版者ELSEVIER SCI LTD
资助机构Chinese Academy of Sciences ; National Natural Science Foundation of China ; State Key Laboratory of Organic Geochemistry, GIGCAS
源URL[http://ir.giec.ac.cn/handle/344007/37332]  
专题中国科学院广州能源研究所
通讯作者Jiang, Wenmin; Li, Yun
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Nat Gas Hydrate, Guangzhou 510650, Peoples R China
3.Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
6.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Jianfeng,Liu, Yuke,Yang, Chao,et al. Evolution of mechanical properties of kerogen with thermal maturity[J]. MARINE AND PETROLEUM GEOLOGY,2022,145:17.
APA Wang, Jianfeng.,Liu, Yuke.,Yang, Chao.,Jiang, Wenmin.,Li, Yun.,...&Peng, Ping 'an.(2022).Evolution of mechanical properties of kerogen with thermal maturity.MARINE AND PETROLEUM GEOLOGY,145,17.
MLA Wang, Jianfeng,et al."Evolution of mechanical properties of kerogen with thermal maturity".MARINE AND PETROLEUM GEOLOGY 145(2022):17.

入库方式： OAI收割

来源：广州能源研究所

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