Change of In Situ Microbial Gas Hydrate Reservoir in Xisha Trough since the Last Pleistocene Glaciation

LIU Jie; SUN Mei-jing; YANG Rui; WU Dai-dai

doi:10.3969/j.issn.2095-560X.2019.03.004

Advances in New and Renewable Energy >

2019 , Vol. 7 >Issue 3: 223 - 232

DOI: https://doi.org/10.3969/j.issn.2095-560X.2019.03.004

Change of In Situ Microbial Gas Hydrate Reservoir in Xisha Trough since the Last Pleistocene Glaciation

LIU Jie ,
SUN Mei-jing ,
YANG Rui ,
WU Dai-dai

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1. Guangzhou Institute of Energy Conversion, Guangzhou 510640, China;
2. Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510640, China;
3. Guangzhou Marine Geological Survey, Guangzhou 510075, China;
4. Qingdao Institute of Marine Geology, Qingdao 266071, Shandong, China

Received date: 2019-02-21

Revised date: 2019-03-19

Online published: 2019-06-29

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Abstract

Sloan’s CSMHYD program was used to calculate the thickness of the gas hydrate stable zone (GHSZ) and the amount of gas hydrate in the Xisha Trough at present and at the last Pleistocene Glaciation, respectively. The effects of the changes in the bottom water temperature and the sea level on GHSZ also discussed. Results showed that the temperature and pressure conditions for gas hydrate formation were available in the Xisha Trough of Qiongdongnan Basin, where water depth is more than 600 m. The thickest GHSZ was located in the east of the study area, with a maximum thickness of more than 300 m. The thickness of GHSZ decreased with the bottom water temperature increase and increased with the sea level increase, wherein the effect of the former was stronger than that of the latter. In the study area, the deposition rate changed significantly during the glacial and interglacial cycles, which changed the concentration of in-situ microbial hydrates. The concentration of methane hydrate formed by in-situ microbial hydrates was also higher in the area with high deposition rate. 0.78 × 10¹² m³ of methane is released from gas hydrate since the Last Pleistocene Glaciation. The released methane should have greatly affected the environment, such as inducing submarine landslides.

Key words： gas hydrate; thickness of stable zones; gas hydrate dissociation; Last Pleistocene Glaciation; Xisha Trough

Cite this article

LIU Jie , SUN Mei-jing , YANG Rui , WU Dai-dai . Change of In Situ Microbial Gas Hydrate Reservoir in Xisha Trough since the Last Pleistocene Glaciation[J]. Advances in New and Renewable Energy, 2019 , 7(3) : 223 -232 . DOI: 10.3969/j.issn.2095-560X.2019.03.004

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