气候变化领域集成服务门户(CCPortal): Dominant products and reactions during organic matter radiolysis: Implications for hydrocarbon generation of uranium-rich shales

CCPortal

DOI	10.1016/j.marpetgeo.2021.105497
	Dominant products and reactions during organic matter radiolysis: Implications for hydrocarbon generation of uranium-rich shales
	Wang, Wenqing; Liu, Chiyang; Liu, Wenhui; Wang, Xiaofeng; Guo, Pei; Wang, Jianqiang; Wang, Zuodong; Li, Zhongping; Zhang, Dongdong
通讯作者	Zhang, DD (通讯作者)，Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China.
发表日期	2022
ISSN	0264-8172
EISSN	1873-4073
卷号	137
英文摘要	Organic-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.
关键词	RADIATION-CHEMISTRY YANCHANG FORMATION HYDROGEN-PEROXIDE WATER RADIOLYSIS SOURCE-ROCKS ALUM SHALE IRRADIATION BASIN GAS DECAY
英文关键词	Artificial irradiation; Radiation products; Structural alterations; Hydrocarbon generation; Uranium-rich shales
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000748991800002
来源期刊	MARINE AND PETROLEUM GEOLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254242
作者单位	[Wang, Wenqing; Liu, Chiyang; Liu, Wenhui; Wang, Xiaofeng; Wang, Jianqiang; Zhang, Dongdong] Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China; [Guo, Pei] Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China; [Wang, Zuodong; Li, Zhongping] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 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]. 中国科学院西北生态环境资源研究院,2022,137.
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.
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).