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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, Dan1,2
2019-07-11
Source PublicationGEOFLUIDS
ISSN1468-8115
Volume2019Pages:23
AbstractThe 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.
DOI10.1155/2019/8608596
Funding OrganizationNational 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
WOS KeywordGEOCHEMICAL CHARACTERISTICS ; NATURAL-GAS ; SOURCE ROCKS ; MISSISSIPPIAN BARNETT ; LIGHT-HYDROCARBONS ; ALKANE GASES ; FIELD ; GENERATION ; SHALE ; GENESIS
Language英语
Funding ProjectNational Natural Science Foundation for Young Scientists of China[41702161]
Funding OrganizationNational 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
WOS Research AreaGeochemistry & Geophysics ; Geology
WOS SubjectGeochemistry & Geophysics ; Geology
WOS IDWOS:000476753800001
PublisherWILEY-HINDAWI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/92967
Collection其他部门
Corresponding AuthorLiu, Dan
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
Recommended Citation
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.
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