Geological controls on the occurrence of recently formed highly concentrated gas hydrate accumulations in the Shenhu area, South China Sea

doi:10.1016/j.marpetgeo.2020.104294

CORC > 海洋研究所 > 中国科学院海洋研究所 > 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, Jiapeng 2,3,4,5,6; Wang, Xiujuan 2,3,4,5,6; Guo, Yiqun 7; Li, Jie 1; Li, Yuanping 1; Zhang, Xin 2,3,5; Qian, Jin 2,3,5; Sun, Luyi 2,3,6
刊名	MARINE AND PETROLEUM GEOLOGY
	2020-06-01
卷号	116 页码:16
关键词	High gas hydrate saturation Upward migration High pore-water chlorinity South China sea
ISSN号	0264-8172
DOI	10.1016/j.marpetgeo.2020.104294
通讯作者	Wang, Xiujuan(wangxiujuan@qdio.ac.cn)
英文摘要	The 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.
资助项目	National 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研究方向	Geology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000528600100016
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/167337]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Wang, Xiujuan
作者单位	1.CNOOC China Ltd, Shenzhen Branch, Shenzhen 518054, Peoples R China 2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China 5.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 7.MNR, Guangzhou Marine Geol Survey, Guangzhou 510760, Peoples R China
推荐引用方式 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.