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Geochemical Characteristics and Significance of Organic Matter in Hydrate-Bearing Sediments from Shenhu Area, South China Sea
Li, Yuanyuan1,2,3; Pang, Lei2; Wang, Zuodong4; Meng, Qianxiang4; Guan, Ping2; Xu, Xuemin5; Fang, Yunxin3,6; Lu, Hailong2; Ye, Jianliang6; Xie, Wenwei6
2022-04-01
Source PublicationMOLECULES
Volume27Issue:8Pages:20
AbstractRock-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.
Keywordorganic matter biomarkers Rock-Eval gas hydrate biodegradation South China Sea
DOI10.3390/molecules27082533
Funding OrganizationGuangdong 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)
WOS KeywordRIVER MOUTH BASIN ; NORMAL-ALKANE DISTRIBUTIONS ; EOCENE WENCHANG FORMATION ; NATURAL-GAS HYDRATE ; SURFACE SEDIMENTS ; QAIDAM BASIN ; N-ALKANES ; HYDROCARBONS ; PETROLEUM ; ORIGIN
Language英语
Funding ProjectGuangdong 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]
Funding OrganizationGuangdong 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)
WOS Research AreaBiochemistry & Molecular Biology ; Chemistry
WOS SubjectBiochemistry & Molecular Biology ; Chemistry, Multidisciplinary
WOS IDWOS:000786748800001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105153
Collection兰州油气中心
Corresponding AuthorFang, Yunxin; Lu, Hailong
Affiliation1.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
Recommended Citation
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.
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