Microbial diversity of two cold seep systems in gas hydrate-bearing sediments in the South China Sea

2019 ◽  
Vol 144 ◽  
pp. 230-239 ◽  
Author(s):  
Hongpeng Cui ◽  
Xin Su ◽  
Fang Chen ◽  
Melanie Holland ◽  
Shengxiong Yang ◽  
...  
Keyword(s):  
South China Sea ◽  
Microbial Diversity ◽  
South China ◽  
Gas Hydrate ◽  
The South China Sea ◽  
Cold Seep ◽  
The South ◽  
China Sea ◽  
Hydrate Bearing Sediments

scholarly journals Physical Properties of Gas Hydrate-Bearing Pressure Core Sediments in the South China Sea

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Jiangong Wei ◽  
Tingting Wu ◽  
Xiuli Feng ◽  
Jinqiang Liang ◽  
Wenjing Li ◽  
...  
Keyword(s):  
South China Sea ◽  
Physical Properties ◽  
Mechanical Behavior ◽  
South China ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Hydrate Bearing Sediments

Gas hydrates are a potential future energy resource and are widely distributed in marine sediments and permafrost areas. The physical properties and mechanical behavior of gas hydrate-bearing sediments are of great significance to seafloor stability and platform safety. In 2013, a large number of pressure cores were recovered during China’s second gas hydrate drilling expedition in the South China Sea. In this study, we determined the gas hydrate distribution, saturation, physical properties, and mechanical behavior of the gas hydrate-bearing sediments by conducting Multi-Sensor Core Logger measurements and triaxial and permeability tests. Disseminated gas hydrates, gas hydrate veins, and gas hydrate slabs were observed in the sediments. The gas hydrate distribution and saturation are spatially heterogeneous, with gas hydrate saturations of 0%–55.3%. The peak deviatoric stress of the gas hydrate-bearing sediments is 0.14–1.62 MPa under a 0.15–2.3 MPa effective confining stress. The permeability is 0.006– 0.095 × 10 − 3   μ m 2 , and it decreases with increasing gas hydrate saturation and burial depth.

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