Carbon and Hydrogen Isotopic Reversals in Highly Mature Coal-Derived Gases: A Case Study of Paleozoic Gases in the Southern Ordos Basin, China

doi:10.1155/2019/8608596

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	Carbon and Hydrogen Isotopic Reversals in Highly Mature Coal-Derived Gases: A Case Study of Paleozoic Gases in the Southern Ordos Basin, China
	Liu, Dan 1,2
刊名	GEOFLUIDS
	2019-07-11
卷号	2019 页码:23
ISSN号	1468-8115
DOI	10.1155/2019/8608596
英文摘要	The compositional carbon isotopic series delta C-13-CH4delta C-13-C2H6 >delta C-13-C3H8) in overmature unconventional shale gases and conventional (coal-derived) gases have been identified. Paleozoic gases in the southern Ordos Basin, China, with partial or complete isotopic reversals, were studied as examples of isotopic fractionation in overmature coal-derived gases. Isotopic compositions of gases of different maturities from the Ordos Basin and shale gases from around the world were compared. Results indicate that carbon isotopic series are related to maturity. Complete isotopic reversal occurs mostly in regions with vitrinite reflectance (R-o) > 2 4%. Where 2 4% > R-o > 2 0%, almost all gases display partial isotopic reversal, with delta C-13-CH4 >delta C-13-C2H6 or delta C-13-C2H6 >delta C-13-C-2-H-8 Carbon isotopic reversal in coal-derived gases is not caused by abiotic origin, the mixing of gases from different types of source rock, abiotic polymerization, wet gas cracking, and other mechanisms that contribute to reversal in shale gases. Based on the unique structure of coaly source rock and the geology of the Ordos Basin, closed-system aromatization-polycondensation reactions are considered the most likely cause of carbon isotopic reversal. During the reactions, isotopically light gases are generated by recombination of previously formed hydrocarbons and residual kerogencoal. Hydrogen isotopic reversal in the southern Ordos Basin might also be caused by aromatization-polycondensation reactions.
资助项目	National Natural Science Foundation for Young Scientists of China[41702161]
WOS关键词	GEOCHEMICAL CHARACTERISTICS ; NATURAL-GAS ; SOURCE ROCKS ; MISSISSIPPIAN BARNETT ; LIGHT-HYDROCARBONS ; ALKANE GASES ; FIELD ; GENERATION ; SHALE ; GENESIS
WOS研究方向	Geochemistry & Geophysics ; Geology
语种	英语
出版者	WILEY-HINDAWI
WOS记录号	WOS:000476753800001
资助机构	National Natural Science Foundation for Young Scientists of China ; National Natural Science Foundation for Young Scientists of China ; National Natural Science Foundation for Young Scientists of China ; National Natural Science Foundation for Young Scientists of China ; National Natural Science Foundation for Young Scientists of China ; National Natural Science Foundation for Young Scientists of China ; National Natural Science Foundation for Young Scientists of China ; National Natural Science Foundation for Young Scientists of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92967]
专题	地质与地球物理研究所_其他部门
通讯作者	Liu, Dan
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Liu, Dan. Carbon and Hydrogen Isotopic Reversals in Highly Mature Coal-Derived Gases: A Case Study of Paleozoic Gases in the Southern Ordos Basin, China[J]. GEOFLUIDS,2019,2019:23.
APA	Liu, Dan.(2019).Carbon and Hydrogen Isotopic Reversals in Highly Mature Coal-Derived Gases: A Case Study of Paleozoic Gases in the Southern Ordos Basin, China.GEOFLUIDS,2019,23.
MLA	Liu, Dan."Carbon and Hydrogen Isotopic Reversals in Highly Mature Coal-Derived Gases: A Case Study of Paleozoic Gases in the Southern Ordos Basin, China".GEOFLUIDS 2019(2019):23.