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Organic molecular evidence of seafloor hydrocarbon seepage in sedimentary intervals down a core in the northern South China Sea
Zhu, Xiaowei; Mao, Shengyi1; Su, Yongge2; Jia, Guodong3; Wu, Nengyou4,5; Wu, Daidai1; Guan, Hongxiang1; Yan, Wen6
2018
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume168Pages:155
AbstractThe hydrocarbons in sedimentary organic matter (OM) at Site 4B in the Pearl River Mouth Basin (PRMB), northern South China Sea (SCS) were analyzed. The odd/even predominance (OEP) of long chain n-alkanes (> n-C-24) with CPI (carbon preference index) values from 1.62 to 3.80 and n-C-29/n-C-31 being the two most abundant in most of the samples are strongly indicative of a terrestrial higher plant source, and the even/odd predominance (EOP) distribution of mid-chain n-alkanes (n-C16-22) suggests a marine bacterial input, probably chemical autotrophic bacteria. However, the biomarker distributions at the 65-70 cm, 80-85 cm and 85-90 cm intervals show a similar to those of crude oils, which were characterized by a dominance of an unresolved complex mixture (UCM) in the n-C20+ region, low CPI values (< 1.5) of long chain n-alkanes, low values of beta beta/(alpha beta + beta beta + beta alpha)-C-30 hopane (< 0.15), and high values (> 9) of total tricyclic terpanes/alpha beta-C-30 hopane. These features are typical characteristics of mature OM that has experienced catagenesis and metagenesis, suggesting that outside hydrocarbons migrated into these three intervals. In terms of petroleum systems developed in the PRMB, hydrocarbon seepage from deep source rocks via a diaper structure and fault system is proposed to be responsible for the occurrence of this mature OM.
DepartmentMSG
Keywordn-Alkanes Hopanes Tricyclic terpanes Hydrocarbon seepage Pearl River Mouth Basin
DOI10.1016/j.jseaes.2018.11.009
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17670
Collection中科院边缘海地质重点实验室
Affiliation1.Chinese Acad Sci, CAS Key Lab Ocean & Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China
2.Chinese Acad Sci, CAS Key Lab Gas Hydrate, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
3.Zhejiang Univ, Sch Earth Sci, Inst Environm & Biogeochem eBig, Hangzhou 310027, Zhejiang, Peoples R China
4.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
5.Qingdao Inst Marine Geol, CGS, Minist Land & Resources, Key Lab Gas Hydrate, Qingdao 266071, Peoples R China
6.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China
7.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhu, Xiaowei,Mao, Shengyi,Su, Yongge,et al. Organic molecular evidence of seafloor hydrocarbon seepage in sedimentary intervals down a core in the northern South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,168:155, 162.
APA Zhu, Xiaowei.,Mao, Shengyi.,Su, Yongge.,Jia, Guodong.,Wu, Nengyou.,...&Yan, Wen.(2018).Organic molecular evidence of seafloor hydrocarbon seepage in sedimentary intervals down a core in the northern South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,168,155.
MLA Zhu, Xiaowei,et al."Organic molecular evidence of seafloor hydrocarbon seepage in sedimentary intervals down a core in the northern South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 168(2018):155.
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