scholarly journals Numerical studies of gas hydrate evolution time in Shenhu area in the northern South China Sea

China Geology ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Yun-xin Fang ◽  
◽  
Jing-an Lu ◽  
Jin-qiang Liang ◽  
Zeng-gui Kuang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Gas Hydrate ◽  
Northern South China Sea ◽  
Shenhu Area ◽  
China Sea ◽  
Evolution Time ◽  
Numerical Studies

Well Log Anomalies Caused by Gas Hydrate Dissociation in the Shenhu Area, Northern South China Sea

2013 ◽  
Vol 56 (4) ◽  
pp. 505-515
Author(s):  
WANG Xiu-Juan ◽  
WU Shi-Guo ◽  
WANG Ji-Liang ◽  
YANG Sheng-Xiong ◽  
WANG Zhen-Zhen
Keyword(s):  
South China Sea ◽  
South China ◽  
Gas Hydrate ◽  
Northern South China Sea ◽  
Well Log ◽  
Shenhu Area ◽  
Hydrate Dissociation ◽  
China Sea

scholarly journals Gas Hydrate System of Shenhu Area, Northern South China Sea: Geochemical Results

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Nengyou Wu ◽  
Haiqi Zhang ◽  
Shengxiong Yang ◽  
Guangxue Zhang ◽  
Jinqiang Liang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Gas Hydrate ◽  
Northern South China Sea ◽  
River Mouth ◽  
Geochemical Data ◽  
Pearl River Mouth Basin ◽  
Silty Clay ◽  
Shenhu Area ◽  
China Sea

The drilling recovered high-concentration methane hydrates (maximum 26–48%) in a disseminated form in silty clay sediments in Shenhu area of Pearl River Mouth Basin, South China Sea. Combining the geochemical data, the gas hydrate-bearing sediments are 10 m to 43 m in thickness and located just above the base of the gas hydrate stability zone. The methane content is 96.10–99.91% with small amount of ethane and propane. The baseline chlorinity of pore waters shows 10% lower than that of shallow sediments below and inside the gas hydrate zone. The methane/ethane ratios are higher than 1000 above the gas hydrate zone and less than 1000 at the interval of gas hydrate zone. The depth of sulphate methane interface varies from site to site as 17 to 27 mbsf. These results show that the methane of gas hydrate was mainly originated from microbial activity and the upward methane flux is minor. This is evidenced by the δC13CH4 values of headspace gases from the gravity piston cores and released gases from pressure cores, which range from −74.3‰  PDB to −46.2‰  PDB, with the majority less than −55%‰  PDB. The hydrate deposit is a distributed gas hydrate system in Shenhu area.

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