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Dominant products and reactions during organic matter radiolysis: Implications for hydrocarbon generation of uranium-rich shales
Wang, Wenqing1; Liu, Chiyang1; Liu, Wenhui1; Wang, Xiaofeng1; Guo, Pei2; Wang, Jianqiang1; Wang, Zuodong3; Li, Zhongping3; Zhang, Dongdong1
2022-03-01
Source PublicationMARINE AND PETROLEUM GEOLOGY
ISSN0264-8172
Volume137Pages:11
AbstractOrganic-rich shales are generally characterized by high uranium (U) contents. The effects of U irradiation on evolution and hydrocarbon generation of organic matter (OM) have attracted substantial attention. However, details on the generation mechanisms of products and the identification of dominant reactions occurring during OM radiolysis remain understudied. In this study, gamma ray was used to irradiate immature kerogen and bitumen, and electron beam was for decane. The contents and carbon (C) isotopic compositions of gaseous products, the liquid products of decane, and the functional groups alterations of kerogens and bitumen were detected. The results showed that, the product generation corresponded well to the structural alteration of OM during radiolysis. C-H and R-CH3 rupture contributed to H-2 and CH4 generation, respectively. 0-containing group cleavage caused CO2 generation, and O-2 presence could enhance the oxidation of OM by joining in the structure of OM or by facilitating the formation of new oxides. H2O addition could not only provide O, enhancing the oxidation of OM, but could also provide H, thus promoting H 2 generation. We identified cracking, cross-linking, and oxidation reactions during the OM radiolysis. C isotopic composition changes in solid OM could facilitate identification of dominant reactions. Non-closed geological environment of shales promoted the occurrence of cracking reaction. The substantial radiation energy generated from U decay in U-rich shales was significant for OM evolution via decrease in H/C, increasing O/C, and via enhancement of dealkylation, aromatization and unsaturation, which were similar to the thermal effects. Moreover, U irradiation could also promote conventional gas and immature gas generation and could provide exogenous H for hydrocarbon generation of OM, especially for OM in an over mature stage. It is essential to consider the effects of U irradiation on the evolution, hydrocarbon generation, and resources assessment of U-rich shales.
KeywordArtificial irradiation Radiation products Structural alterations Hydrocarbon generation Uranium-rich shales
DOI10.1016/j.marpetgeo.2021.105497
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordRADIATION-CHEMISTRY ; YANCHANG FORMATION ; HYDROGEN-PEROXIDE ; WATER RADIOLYSIS ; SOURCE-ROCKS ; ALUM SHALE ; IRRADIATION ; BASIN ; GAS ; DECAY
Language英语
Funding ProjectNational Natural Science Foundation of China[41330315] ; National Natural Science Foundation of China[41930426]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000748991800002
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104018
Collection兰州油气中心
Corresponding AuthorZhang, Dongdong
Affiliation1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
2.Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China
3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
Recommended Citation
GB/T 7714
Wang, Wenqing,Liu, Chiyang,Liu, Wenhui,et al. Dominant products and reactions during organic matter radiolysis: Implications for hydrocarbon generation of uranium-rich shales[J]. MARINE AND PETROLEUM GEOLOGY,2022,137:11.
APA Wang, Wenqing.,Liu, Chiyang.,Liu, Wenhui.,Wang, Xiaofeng.,Guo, Pei.,...&Zhang, Dongdong.(2022).Dominant products and reactions during organic matter radiolysis: Implications for hydrocarbon generation of uranium-rich shales.MARINE AND PETROLEUM GEOLOGY,137,11.
MLA Wang, Wenqing,et al."Dominant products and reactions during organic matter radiolysis: Implications for hydrocarbon generation of uranium-rich shales".MARINE AND PETROLEUM GEOLOGY 137(2022):11.
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