Gas hydrate occurrence on the continental slope of the northern South China Sea

doi:10.1016/j.marpetgeo.2004.11.006

IOCAS-IR > 海洋地质与环境重点实验室

	Gas hydrate occurrence on the continental slope of the northern South China Sea
	Wu, S ; Zhang, G ; Huang, Y; Liang, J ; Wong, HK
	2005-03-01
发表期刊	MARINE AND PETROLEUM GEOLOGY
ISSN	0264-8172
卷号	22 期号:3 页码:403-412
文章类型	Article
摘要	High-resolution multi-channel seismic data and geological samples were collected during two research cruises of the R/V FENDOU 4 in 1999 and 2000. Studies on these data and samples together with results from sites 1143-1145 and 1148 of ODP Leg 184 suggest that the geological structure on the continental slope of the northern South China Sea is favorable for the formation of gas hydrates. Bottom simulating reflectors (BSRs) and geochemical anomalies which indicate the existence of gas hydrates have been recognized in sediments of the Xisha Trough, the Dongsha Rise and the accretionary wedge of the Manila subduction zone. These gas hydrates are generated by two different mechanisms depending on the tectonic regime and the seismic and geochemical characteristics. The first applies to the passive continental margin of the nor-them South China Sea on the Dongsha Rise and in the Xisha Trough. The gas hydrates are associated with diapiric structures, active faults, slumps and gravity flows as well as high Late Cenozoic sedimentation rates. Their seismic expression includes BSRs, seismic blanking zones and velocity anomalies. The second mechanism is operative on the active continental margin along the Manila subduction zone, especially in the accretionary wedge. Here, gas hydrate occurrence is marked by widespread BSRs and acoustic 'pull-down' possibly related to the existence of free gas in the sediments beneath the BSR. The thickness of the seismic blanking zones averages 250 m, suggesting that the stable gas hydrate zone has about the same thickness. (c) 2005 Elsevier Ltd. All rights reserved.; High-resolution multi-channel seismic data and geological samples were collected during two research cruises of the R/V FENDOU 4 in 1999 and 2000. Studies on these data and samples together with results from sites 1143-1145 and 1148 of ODP Leg 184 suggest that the geological structure on the continental slope of the northern South China Sea is favorable for the formation of gas hydrates. Bottom simulating reflectors (BSRs) and geochemical anomalies which indicate the existence of gas hydrates have been recognized in sediments of the Xisha Trough, the Dongsha Rise and the accretionary wedge of the Manila subduction zone. These gas hydrates are generated by two different mechanisms depending on the tectonic regime and the seismic and geochemical characteristics. The first applies to the passive continental margin of the nor-them South China Sea on the Dongsha Rise and in the Xisha Trough. The gas hydrates are associated with diapiric structures, active faults, slumps and gravity flows as well as high Late Cenozoic sedimentation rates. Their seismic expression includes BSRs, seismic blanking zones and velocity anomalies. The second mechanism is operative on the active continental margin along the Manila subduction zone, especially in the accretionary wedge. Here, gas hydrate occurrence is marked by widespread BSRs and acoustic 'pull-down' possibly related to the existence of free gas in the sediments beneath the BSR. The thickness of the seismic blanking zones averages 250 m, suggesting that the stable gas hydrate zone has about the same thickness. (c) 2005 Elsevier Ltd. All rights reserved.
关键词	Gas Hydrate Bottom Simulating Reflector Geological Structure South China Sea
学科领域	Geosciences, Multidisciplinary
DOI	10.1016/j.marpetgeo.2004.11.006
收录类别	SCI
语种	英语
WOS记录号	WOS:000228229700007
引用统计	被引频次：135[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/3748
专题	海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Guangzhou Marine Geol Survey, MLR, Guangzhou 510760, Peoples R China 3.Univ Hamburg, Inst Biogeochem & Marine Chem, D-20146 Hamburg, Germany
推荐引用方式 GB/T 7714	Wu, S,Zhang, G,Huang, Y,et al. Gas hydrate occurrence on the continental slope of the northern South China Sea[J]. MARINE AND PETROLEUM GEOLOGY,2005,22(3):403-412.
APA	Wu, S,Zhang, G,Huang, Y,Liang, J,&Wong, HK.(2005).Gas hydrate occurrence on the continental slope of the northern South China Sea.MARINE AND PETROLEUM GEOLOGY,22(3),403-412.
MLA	Wu, S,et al."Gas hydrate occurrence on the continental slope of the northern South China Sea".MARINE AND PETROLEUM GEOLOGY 22.3(2005):403-412.

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