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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
Source PublicationSCIENCE CHINA-EARTH SCIENCES
Volume56Issue:4Pages:513-520
AbstractTemperature 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.
SubtypeArticle
KeywordControlling Factors Bsr Distribution Gas Hydrate Occurrence Seafloor Gradient Structural Intensity T-p Condition
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11430-013-4596-3
WOS Subject ExtendedGeology
WOS KeywordHEAT-FLOW
Indexed BySCI
Language英语
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000317347200001
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10043
Collection中国科学院广州能源研究所
Affiliation1.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
Recommended Citation
GB/T 7714
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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