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The C-13-depleted methane in terrigenous shale gas: A case study in the Triassic Yanchang Formation, Ordos Basin
Meng, Qiang1; Wang, Xiaofeng2,7; Shi, Baoguang3; Lei, Yuhong4; Zhao, Heng5; Zhao, Qianping6; Yin, Jintao6; Gao, Chao5,6
2022-07-01
Source PublicationMARINE AND PETROLEUM GEOLOGY
ISSN0264-8172
Volume141Pages:12
AbstractThe methane carbon isotopic composition (delta C-13(1)) of some shale gas, and of some conventional gas in shale gas regions, is more depleted in (CH4)-C-13 than can be predicted from vitrinite reflectance (Ro) using the delta(13)C1-Ro equation. This is also often the case for coal bed methane. There is currently no convincing explanation for this phenomenon primarily because wellhead gas or core desorption cannot represent the original, in-situ state of the shale gas, owing to problems of desorption fractionation, lost gas, and residual gas. In this paper, we focus on shale gas in the Yanchang Formation of the Ordos Basin. To avoid the above-mentioned problems and obtain the shale gas in-situ, two shale samples, obtained from pressure coring, were used for parallel experiments. The gas desorption experiment was carried out under normal temperature and heating conditions, the core residual gas was obtained by crushing, and the components and carbon isotopic composition of desorption gas and residual gas were analyzed. The delta C-13(1) values for the two shale (Ro = 1.2%) desorption gas samples were-50.7 parts per thousand and-50.8 parts per thousand, about 10 parts per thousand lighter than the value of-40.6 parts per thousand predicted by the empirical delta C-13(1)-Ro formula. The delta C-13(1) values for the small amount of core residual gas in the two samples were-47.0%o and -47.6 parts per thousand indicating that delta C-13(1) of Yanchang Formation in-situ shale gas is about 10%o lighter than the delta 13C1-Ro empirical formula predicts. This difference may be related to gas adsorption onto organic matter and clay minerals in shale. The negative delta C-13(1) is due to the retention of pre-biogas and early thermogenic gas. Dynamic adsorption experiments with activated carbon and a 5 angstrom molecular sieve show that early methane molecules preferentially occupy adsorption sites with relatively low pore radii and are likely to be replaced by late methane molecules, due to the high adsorption energy. The pore size distribution characteristics of shale in the Yanchang Formation are generally consistent with this pattern. In general, the delta C-13(1) of shale gas is related to adsorption, and the degree to which it is negative is related to the adsorption intensity and pore structure of the source rock.
KeywordMethane Carbon isotopic fractionation Shale gas Yanchang formation Ordos basin Adsorption
DOI10.1016/j.marpetgeo.2022.105688
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China ; Natural Science Foundation of Jiangsu Province, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China ; Natural Science Foundation of Jiangsu Province, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China ; Natural Science Foundation of Jiangsu Province, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China ; Natural Science Foundation of Jiangsu Province, China
WOS KeywordCARBON ISOTOPIC COMPOSITION ; GASEOUS HYDROCARBONS ; CONTINENTAL SHALES ; LONGMAXI FORMATION ; LACUSTRINE SHALE ; NATURAL GASES ; FRACTIONATION ; GEOCHEMISTRY ; MARINE ; PART
Language英语
Funding ProjectNational Natural Science Foundation of China[41903013] ; National Natural Science Foundation of China[41972134] ; "Western Light Project" of the Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China[BK20200171]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China ; Natural Science Foundation of Jiangsu Province, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China ; Natural Science Foundation of Jiangsu Province, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China ; Natural Science Foundation of Jiangsu Province, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China ; Natural Science Foundation of Jiangsu Province, China
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000797247100002
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/106014
Collection兰州油气中心
油气资源研究院重点实验室
Corresponding AuthorWang, Xiaofeng
Affiliation1.Yangtze Univ, Coll Resources & Environm, Hubei Key Lab Petr Geochem & Environm, Wuhan 430100, Peoples R China
2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xi'an 710069, Peoples R China
3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
5.Jiangsu Design Inst Geol Mineral Resources, Testing Ctr China Natl Adm Coal Geol CNACG, Key Lab Shale Gas, Key Lab Mineral Resources Coal Measures, Xuzhou 221006, Peoples R China
6.Shaanxi Yanchang Petr Grp Co Ltd, Res Inst Petr Explorat & Dev, Xi'an 710065, Peoples R China
7.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, 229 Taibai North Rd, Xi'an 710069, Peoples R China
Recommended Citation
GB/T 7714
Meng, Qiang,Wang, Xiaofeng,Shi, Baoguang,et al. The C-13-depleted methane in terrigenous shale gas: A case study in the Triassic Yanchang Formation, Ordos Basin[J]. MARINE AND PETROLEUM GEOLOGY,2022,141:12.
APA Meng, Qiang.,Wang, Xiaofeng.,Shi, Baoguang.,Lei, Yuhong.,Zhao, Heng.,...&Gao, Chao.(2022).The C-13-depleted methane in terrigenous shale gas: A case study in the Triassic Yanchang Formation, Ordos Basin.MARINE AND PETROLEUM GEOLOGY,141,12.
MLA Meng, Qiang,et al."The C-13-depleted methane in terrigenous shale gas: A case study in the Triassic Yanchang Formation, Ordos Basin".MARINE AND PETROLEUM GEOLOGY 141(2022):12.
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