IOCAS-IR  > 海洋地质与环境重点实验室
Geological controls on the occurrence of recently formed highly concentrated gas hydrate accumulations in the Shenhu area, South China Sea
Jin, Jiapeng1,2,3,4,5; Wang, Xiujuan1,2,3,4,5; Guo, Yiqun6; Li, Jie7; Li, Yuanping7; Zhang, Xin1,2,5; Qian, Jin1,2,5; Sun, Luyi1,2,4
2020-06-01
Source PublicationMARINE AND PETROLEUM GEOLOGY
ISSN0264-8172
Volume116Pages:16
Corresponding AuthorWang, Xiujuan(wangxiujuan@qdio.ac.cn)
AbstractThe Shenhu area is an important gas hydrate exploration and production test zone in the northern slope of South China Sea. A sediment layer with high gas hydrate saturations and abnormally high pore-water chlorinity concentrations has been identified from recently acquired logging-while-drilling (LWD) data and core samples. Data from four sites (W19, W18, SC-01 and SC-02) indicates that most gas hydrate-bearing sediments (GHBSs) form preferentially in low gamma ray log inferred coarser-grained units, except at SC-02. At this site, a striking increase in pore-water chlorinity values, with a maximum value exceeding 816 mM at a depth of 158 mbsf, indicates an active or recently-active system. A one-dimensional (1D) diffusion model is used to estimate the time when the gas hydrate formed based on the saturation, thickness, and porosity of gas hydrate-bearing units at each site. The results show that gas hydrates at sites SC-02 and W18 respectively formed 19-29 thousand and 26-28 thousand years ago (assuming a closed system). To further investigate the apparently young age of these highly saturated gas hydrate accumulations, three-dimensional (3D) seismic variance and frequency attributes extracted along different sedimentary layers are shown to provide evidence for vertical and lateral gas migration along normal faults and gas chimneys. The high pore-water chlorinities and evidence for fluid migration from deeper sedimentary sections suggest that upward migration of methane gas into the hydrate stability zone may have contributed to the recent formation of the highly concentrated gas hydrate occurrences identified in the Shenhu area.
KeywordHigh gas hydrate saturation Upward migration High pore-water chlorinity South China sea
DOI10.1016/j.marpetgeo.2020.104294
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2017YFC0307601] ; National Natural Science Foundation of China[41676041] ; National Natural Science Foundation of China[41676040] ; CAS Interdisciplinary Innovation team[JCTD-2018-12] ; National 863 Program[2013AA092601]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000528600100016
PublisherELSEVIER SCI 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/337002/167338
Collection海洋地质与环境重点实验室
Corresponding AuthorWang, Xiujuan
Affiliation1.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China
6.MNR, Guangzhou Marine Geol Survey, Guangzhou 510760, Peoples R China
7.CNOOC China Ltd, Shenzhen Branch, Shenzhen 518054, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Jin, Jiapeng,Wang, Xiujuan,Guo, Yiqun,et al. Geological controls on the occurrence of recently formed highly concentrated gas hydrate accumulations in the Shenhu area, South China Sea[J]. MARINE AND PETROLEUM GEOLOGY,2020,116:16.
APA Jin, Jiapeng.,Wang, Xiujuan.,Guo, Yiqun.,Li, Jie.,Li, Yuanping.,...&Sun, Luyi.(2020).Geological controls on the occurrence of recently formed highly concentrated gas hydrate accumulations in the Shenhu area, South China Sea.MARINE AND PETROLEUM GEOLOGY,116,16.
MLA Jin, Jiapeng,et al."Geological controls on the occurrence of recently formed highly concentrated gas hydrate accumulations in the Shenhu area, South China Sea".MARINE AND PETROLEUM GEOLOGY 116(2020):16.
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