IOCAS-IR  > 海洋地质与环境重点实验室
In situ Raman spectroscopy study of synthetic gas hydrate formed by cold seep flow in the South China Sea
Du, Zengfeng1,2,3; Zhang, Xin1,2,3,4; Xi, Shichuan1,2,4; Li, Lianfu1,2,4; Luan, Zhendong1,2,3; Lian, Chao1,2; Wang, Bing1,2,4; Yan, Jun1,2
2018-12-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume168Pages:197-206
Corresponding AuthorZhang, Xin(xzhang@qdio.ac.cn)
AbstractProperties of gas hydrate are commonly investigated in laboratory by simulators or studied using the hydrate samples recovered from permafrost and marine sediments. Here synthetic gas hydrate (SGH) is quickly formed for the first time by fluids and bubbles erupted from the active cold seeps at the Formosa Ridge in the South China Sea (SCS). SGH samples are in situ detected by a Raman insertion probe for gas hydrate (RiP-Gh) which is deployed by the remotely operated vehicle (ROV) Faxian. Both spatial and temporal in situ Raman spectra of the SGH samples are acquired in order to determine the structure and the evolution of the synthetic gas hydrate. Authigenic carbonate debris or other debris serving as nucleation particles, which is found in the in situ Raman spectra of SGH samples for the first time, may be one factor that can promote the formation of synthetic gas hydrate. The gas-water interface demonstrated by the observation results, also contributes to the quick formation of SGH samples, which agrees well with the previous study. In situ Raman spectra of three SGH samples which have been placed on the seafloor for 0 h, 4 h and 21 h respectively are acquired. Laboratory Raman spectra of one sample which has been surprisingly found and recovered after 9840 h (410 days) since formed on the seafloor are also acquired. The Raman spectra of the four SGH samples indicate that the methane large-to-small cage occupancy ratios of the hydrates vary from 1.01 to 1.39, and the ratios of methane large-to-gas of the hydrates increase from 0.53 to 1.55. Overall, our work suggests a new explanation for the quick formation of gas hydrate compared to that in laboratory simulation work, and reveals the evolution of synthetic gas hydrate after quick formation, which provides a new insight for the study of natural gas hydrate.
KeywordSynthetic gas hydrate In situ detection Raman spectroscopy Cold seep flow
DOI10.1016/j.jseaes.2018.02.003
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41576104] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-DQC004] ; Open Research Project of National Major Science & Technology Infrastructure (RV KEXUE)[NMSTI-KEXUE2017K01] ; Strategic Priority Research Program, CAS[XDA11040301] ; Strategic Priority Research Program, CAS[XDA11030301] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1606401] ; National Key R&D Program of China[2016YFC0302103] ; Taishan Scholar Project Funding[tspd20161007]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000452945000020
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/155827
Collection海洋地质与环境重点实验室
Corresponding AuthorZhang, Xin
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Du, Zengfeng,Zhang, Xin,Xi, Shichuan,et al. In situ Raman spectroscopy study of synthetic gas hydrate formed by cold seep flow in the South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,168:197-206.
APA Du, Zengfeng.,Zhang, Xin.,Xi, Shichuan.,Li, Lianfu.,Luan, Zhendong.,...&Yan, Jun.(2018).In situ Raman spectroscopy study of synthetic gas hydrate formed by cold seep flow in the South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,168,197-206.
MLA Du, Zengfeng,et al."In situ Raman spectroscopy study of synthetic gas hydrate formed by cold seep flow in the South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 168(2018):197-206.
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