Geophysical signatures associated with fluid flow and gas hydrate occurrence in a tectonically quiescent sequence, Qiongdongnan Basin, South China Sea

doi:10.1111/j.1468-8123.2010.00292.x

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	Geophysical signatures associated with fluid flow and gas hydrate occurrence in a tectonically quiescent sequence, Qiongdongnan Basin, South China Sea
	Wang, X.1,2 ; Wu, S.1,2; Yuan, S.1,2,5 ; Wang, D.1,2; Ma, Y.1,2 ; Yao, G.3; Gong, Y.4; Zhang, G.4; Wang, X, Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
	2010-08-01
发表期刊	GEOFLUIDS
ISSN	1468-8115
卷号	10 期号:3 页码:351-368
文章类型	Article
摘要	Interpretation of high-resolution two-dimensional (2D) and three-dimensional (3D) seismic data collected in the Qiongdongnan Basin, South China Sea reveals the presence of polygonal faults, pockmarks, gas chimneys and slope failure in strata of Pliocene and younger age. The gas chimneys are characterized by low-amplitude reflections, acoustic turbidity and low P-wave velocity indicating fluid expulsion pathways. Coherence time slices show that the polygonal faults are restricted to sediments with moderate-amplitude, continuous reflections. Gas hydrates are identified in seismic data by the presence of bottom simulating reflectors (BSRs), which have high amplitude, reverse polarity and are subparallel to seafloor. Mud diapirism and mounded structures have variable geometry and a great diversity regarding the origin of the fluid and the parent beds. The gas chimneys, mud diapirism, polygonal faults and a seismic facies-change facilitate the upward migration of thermogenic fluids from underlying sediments. Fluids can be temporarily trapped below the gas hydrate stability zone, but fluid advection may cause gas hydrate dissociation and affect the thickness of gas hydrate zone. The fluid accumulation leads to the generation of excess pore fluids that release along faults, forming pockmarks and mud volcanoes on the seafloor. These features are indicators of fluid flow in a tectonically-quiescent sequence, Qiongdongnan Basin.; Interpretation of high-resolution two-dimensional (2D) and three-dimensional (3D) seismic data collected in the Qiongdongnan Basin, South China Sea reveals the presence of polygonal faults, pockmarks, gas chimneys and slope failure in strata of Pliocene and younger age. The gas chimneys are characterized by low-amplitude reflections, acoustic turbidity and low P-wave velocity indicating fluid expulsion pathways. Coherence time slices show that the polygonal faults are restricted to sediments with moderate-amplitude, continuous reflections. Gas hydrates are identified in seismic data by the presence of bottom simulating reflectors (BSRs), which have high amplitude, reverse polarity and are subparallel to seafloor. Mud diapirism and mounded structures have variable geometry and a great diversity regarding the origin of the fluid and the parent beds. The gas chimneys, mud diapirism, polygonal faults and a seismic facies-change facilitate the upward migration of thermogenic fluids from underlying sediments. Fluids can be temporarily trapped below the gas hydrate stability zone, but fluid advection may cause gas hydrate dissociation and affect the thickness of gas hydrate zone. The fluid accumulation leads to the generation of excess pore fluids that release along faults, forming pockmarks and mud volcanoes on the seafloor. These features are indicators of fluid flow in a tectonically-quiescent sequence, Qiongdongnan Basin. Geofluids (2010) 10, 351-368.
关键词	Chimney Gas Hydrate Pockmark Polygonal Fault Qiongdongnan Basin
学科领域	Geochemistry & Geophysics ; Geology
DOI	10.1111/j.1468-8123.2010.00292.x
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000280973700003
引用统计	被引频次：59[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/337002/1836
专题	研究生部海洋地质与环境重点实验室
通讯作者	Wang, X, Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
作者单位	1.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 3.PetroChina Hangzhou Inst Geol, Hangzhou, Zhejiang, Peoples R China 4.MLR, Guangzhou Marine Geol Survey, Guangzhou, Guangdong, Peoples R China 5.Res Inst Petr Explorat & Dev, State Key Lab Enhanced Oil Recovery, Beijing, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Wang, X.,Wu, S.,Yuan, S.,et al. Geophysical signatures associated with fluid flow and gas hydrate occurrence in a tectonically quiescent sequence, Qiongdongnan Basin, South China Sea[J]. GEOFLUIDS,2010,10(3):351-368.
APA	Wang, X..,Wu, S..,Yuan, S..,Wang, D..,Ma, Y..,...&Wang, X, Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao, Peoples R China.(2010).Geophysical signatures associated with fluid flow and gas hydrate occurrence in a tectonically quiescent sequence, Qiongdongnan Basin, South China Sea.GEOFLUIDS,10(3),351-368.
MLA	Wang, X.,et al."Geophysical signatures associated with fluid flow and gas hydrate occurrence in a tectonically quiescent sequence, Qiongdongnan Basin, South China Sea".GEOFLUIDS 10.3(2010):351-368.

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