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Controlling factors for gas hydrate occurrence in Shenhu area on the northern slope of the South China Sea
Wang HongBin1,2; Yang ShengXiong1; Wu NengYou2,3; Zhang GuangXue1; Liang JinQiang1; Chen DuoFu2,3
2013-04-01
发表期刊SCIENCE CHINA-EARTH SCIENCES
卷号56期号:4页码:513-520
摘要Temperature and pressure on seafloor of the northern slope in the South China Sea are suitable for gas hydrate formation, but bottom simulation reflector (BSR), an indication of gas hydrate occurrence, only occurred in limited areas of the slope. Drillings in the BSR-distributed area (the District S) on the northern slope of the South China Sea suggested that gas hydrate only occurred at Sites SH2, SH3, and SH7 with high saturation (up to 20%-40%), and there is no hydrate at Sites SH1 and SH5 although the distance between SH1 to SH3 is only 500 m. In this paper, we investigated seafloor gradient, fault development, temperature, and pressure in the District S on the northern slope of the South China Sea to understand the possible factors controlling BSR distribution and gas hydrate occurrence. The District S is a structurally fractured continental slope zone and its seafloor gradient varied greatly. The BSR-occurred areas have an average gradient of 19.89x10(-2) whereas the BSR-free zone has the average gradient of 10.57x10(-2). The calculated relative structural intensities from fault densities and displacements show that the BSR-distributed areas tend to occur in the areas with a moderately high structural intensity, where faults frequently developed close to the seafloor that are possibly favored for lateral migration of gases. On the basis of temperatures and pressures at drilling sites, hydrate-occurred Sites SH2, SH3, and SH7 are located within the thermodynamically stable area for methane hydrate, and hydrate-absent Sites SH1 and SH5 are out of the thermodynamically stable area for methane hydrate formation, suggesting that both BSR and the thermodynamic stability are necessary for hydrate occurrence in the subsurface.
文章类型Article
关键词Controlling Factors Bsr Distribution Gas Hydrate Occurrence Seafloor Gradient Structural Intensity T-p Condition
WOS标题词Science & Technology ; Physical Sciences
DOI10.1007/s11430-013-4596-3
研究领域[WOS]Geology
关键词[WOS]HEAT-FLOW
收录类别SCI
语种英语
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000317347200001
引用统计
被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.giec.ac.cn/handle/344007/10043
专题中国科学院广州能源研究所
作者单位1.Guangzhou Marine Geol Survey, Minist Land & Resources, Key Lab Marine Mineral Resources, Guangzhou 510760, Guangdong, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou Res Ctr Gas Hydrate, Guangzhou 510640, Peoples R China
3.Chinese Acad Sci, CAS Key Lab Marginal Sea Geol, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
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Wang HongBin,Yang ShengXiong,Wu NengYou,et al. Controlling factors for gas hydrate occurrence in Shenhu area on the northern slope of the South China Sea[J]. SCIENCE CHINA-EARTH SCIENCES,2013,56(4):513-520.
APA Wang HongBin,Yang ShengXiong,Wu NengYou,Zhang GuangXue,Liang JinQiang,&Chen DuoFu.(2013).Controlling factors for gas hydrate occurrence in Shenhu area on the northern slope of the South China Sea.SCIENCE CHINA-EARTH SCIENCES,56(4),513-520.
MLA Wang HongBin,et al."Controlling factors for gas hydrate occurrence in Shenhu area on the northern slope of the South China Sea".SCIENCE CHINA-EARTH SCIENCES 56.4(2013):513-520.
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