NDLI: Controlling factors for gas hydrate occurrence in Shenhu area on the northern slope of the South China Sea

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Controlling factors for gas hydrate occurrence in Shenhu area on the northern slope of the South China Sea

Content Provider	Springer Nature Link
Author	Wang, HongBin Yang, ShengXiong Wu, NengYou Zhang, GuangXue Liang, JinQiang Chen, DuoFu
Copyright Year	2013
Abstract	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 19.89×10$^{−2}$ whereas the BSR-free zone has the average gradient of 10.57×10$^{−2}$. 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.
Starting Page	513
Ending Page	520
Page Count	8
File Format	PDF
ISSN	16747313
Journal	Science in China Series D: Earth Sciences
Volume Number	56
Issue Number	4
e-ISSN	18691897
Language	English
Publisher	SP Science China Press
Publisher Date	2013-04-05
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	controlling factors BSR distribution gas hydrate occurrence seafloor gradient structural intensity T-P condition Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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Variations of pore water sulfate gradients in sediments as indicator for underlying gas hydrate in Shenhu Area, the South China Sea

Heat flow derived from BSR and its implications for gas hydrate stability zone in Shenhu Area of northern South China Sea

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Effect of thermal stimulation on gas production from hydrate deposits in Shenhu area of the South China Sea

Migration of methane associated with gas hydrates of the Shenhu Area, northern slope of South China Sea

Elemental and Isotopic Signatures of Bulk Sedimentary Organic Matter in Shenhu Area, Northern South China Sea

Geochemical characteristics of pore water in shallow sediments from Shenhu area of South China Sea and their significance for gas hydrate occurrence

Controlling factors for gas hydrate occurrence in Shenhu area on the northern slope of the South China Sea

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