Organic molecular evidence of seafloor hydrocarbon seepage in sedimentary intervals down a core in the northern South China Sea

doi:10.1016/j.jseaes.2018.11.009

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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, Shengyi 6; Su, Yongge 7; Jia, Guodong 1; Wu, Nengyou 2,3; Wu, Daidai 6; Guan, Hongxiang 6; Yan, Wen 5
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2018
卷号	168 页码:155
关键词	n-Alkanes Hopanes Tricyclic terpanes Hydrocarbon seepage Pearl River Mouth Basin
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2018.11.009
英文摘要	The 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.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17670]
专题	南海海洋研究所_中科院边缘海地质重点实验室
作者单位	1.Zhejiang Univ, Sch Earth Sci, Inst Environm & Biogeochem eBig, Hangzhou 310027, Zhejiang, Peoples R China 2.Qingdao Inst Marine Geol, CGS, Minist Land & Resources, Key Lab Gas Hydrate, Qingdao 266071, Peoples R China 3.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China 6.Chinese Acad Sci, CAS Key Lab Ocean & Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China 7.Chinese Acad Sci, CAS Key Lab Gas Hydrate, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 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.