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Geochemical Characteristics and Significance of Organic Matter in Hydrate-Bearing Sediments from Shenhu Area, South China Sea

文献类型：期刊论文

作者Li, Yuanyuan1,2,3; Pang, Lei2; Wang, Zuodong4; Meng, Qianxiang4; Guan, Ping2; Xu, Xuemin5; Fang, Yunxin3,6; Lu, Hailong2; Ye, Jianliang6; Xie, Wenwei6
刊名MOLECULES
出版日期2022-04-01
卷号27期号:8页码:20
关键词organic matter biomarkers Rock-Eval gas hydrate biodegradation South China Sea
DOI10.3390/molecules27082533
英文摘要Rock-Eval pyrolysis and the biomarker composition of organic matter were systematically studied in hydrate-bearing sediments from the Shenhu area, South China Sea. The n-alkane distribution patterns revealed that the organic matter in the sediments appeared to originate from mixed sources of marine autochthonous input, terrestrial higher plants, and ancient reworked organic matter. The low total organic carbon contents (average < 0.5%) and the low hydrogen index (HI, <80 mg HC/g TOC) suggested the poor hydrocarbon-generation potential of the deposited organic matter at a surrounding temperature of <20 degrees C in unconsolidated sediments. The abnormally high production index and the fossil-originated unresolved complex mixture (UCM) accompanied by sterane and hopane of high maturity indicated the contribution of deep hydrocarbon reservoirs. Preliminary oil-to-source correlation for the extracts implied that the allochthonous hydrocarbons in the W01B and W02B sediments might have originated from the terrestrial source rocks of mature Enping and Wenchang formations, while those of W03B seem to be derived from more reduced and immature marine source rocks such as the Zhuhai formation. The results of the organic extracts supported the previous identification of source rocks based on the isotopic composition of C2+ hydrate-bound gases. The biomarker of methanogens, squalane, was recognized in the sediments of this study, possibly suggesting the generation of secondary microbial gases which are coupled with the biodegradation of the deep allochthonous hydrocarbons.
WOS关键词RIVER MOUTH BASIN ; NORMAL-ALKANE DISTRIBUTIONS ; EOCENE WENCHANG FORMATION ; NATURAL-GAS HYDRATE ; SURFACE SEDIMENTS ; QAIDAM BASIN ; N-ALKANES ; HYDROCARBONS ; PETROLEUM ; ORIGIN
资助项目Guangdong Major Project of Basic and Applied Basic Research[2020B0301030003] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0102]
WOS研究方向Biochemistry & Molecular Biology ; Chemistry
语种英语
WOS记录号WOS:000786748800001
出版者MDPI
资助机构Guangdong Major Project of Basic and Applied Basic Research ; Guangdong Major Project of Basic and Applied Basic Research ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Guangdong Major Project of Basic and Applied Basic Research ; Guangdong Major Project of Basic and Applied Basic Research ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Guangdong Major Project of Basic and Applied Basic Research ; Guangdong Major Project of Basic and Applied Basic Research ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Guangdong Major Project of Basic and Applied Basic Research ; Guangdong Major Project of Basic and Applied Basic Research ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)
源URL[http://ir.iggcas.ac.cn/handle/132A11/105153]  
专题地质与地球物理研究所_兰州油气中心
通讯作者Fang, Yunxin; Lu, Hailong
作者单位1.Peking Univ, Coll Engn, Beijing 100871, Peoples R China
2.Peking Univ, Beijing Int Ctr Gas Hydrate, Sch Earth & Space Sci, Beijing 100871, Peoples R China
3.Southern Marine Sci & Engn Guangdong Lab, Guangzhou 511458, Peoples R China
4.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resource Res, Lanzhou 730000, Peoples R China
5.Natl Res Ctr Geoanal, Beijing 100037, Peoples R China
6.Guangzhou Marine Geol Survey, MLR Key Lab Marine Mineral Resources, Minist Land & Resources, Guangzhou 510075, Peoples R China
推荐引用方式
GB/T 7714		 Li, Yuanyuan,Pang, Lei,Wang, Zuodong,et al. Geochemical Characteristics and Significance of Organic Matter in Hydrate-Bearing Sediments from Shenhu Area, South China Sea[J]. MOLECULES,2022,27(8):20.
APA Li, Yuanyuan.,Pang, Lei.,Wang, Zuodong.,Meng, Qianxiang.,Guan, Ping.,...&Xie, Wenwei.(2022).Geochemical Characteristics and Significance of Organic Matter in Hydrate-Bearing Sediments from Shenhu Area, South China Sea.MOLECULES,27(8),20.
MLA Li, Yuanyuan,et al."Geochemical Characteristics and Significance of Organic Matter in Hydrate-Bearing Sediments from Shenhu Area, South China Sea".MOLECULES 27.8(2022):20.

入库方式： OAI收割

来源：地质与地球物理研究所

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