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Factors affecting the thickness of gas hydrate stability zones in the Huaguang Sag, Qiongdongnan Basin
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Jie Liu1, 2, Rui Yang3, Daidai Wu1, 2, Guangrong Jin1, Hui Zhang1
Haiyang Xuebao | 2019, 41(8) : 13 - 25
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Haiyang Xuebao | 2019, 41(8): 13-25
• Marine Geology •
Factors affecting the thickness of gas hydrate stability zones in the Huaguang Sag, Qiongdongnan Basin
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Jie Liu1, 2, Rui Yang3, Daidai Wu1, 2, Guangrong Jin1, Hui Zhang1
Affiliations
  • 1 Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Science, Guangzhou 510640, China
  • 2 Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 511458, China
  • 3 Qingdao Institute of Marine Geology, Qingdao 266071, China
Published: 2019-08-25 doi: 10.3969/j.issn.0253-4193.2019.08.002
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In order to study the distribution of gas hydrate stable zones (GHSZ) in the Huaguang Sag of Qiongdongnan Basin, the important factors affecting GHSZ's thickness are quantitatively studied, including hydrostatic pressure, bottom water temperature, geothermal gradient and gas source composition. Then, it analyzes that the thickness distribution of the present methane GHSZ in Huaguang Sag. Finally, based on the historical evolution process of above various factors, the evolution of gas hydrate stabilization zone since 1.05 Ma BP in this area is preliminarily discussed. The results show that: (1) the gas source composition and seabed temperature have a great influence on the GHSZ in the study area, and the thickness of GHSZ has a good linear negative correlation with seabed temperature; (2) the temperature and pressure conditions for gas hydrate formation are available in the Huaguang Sag of Qiongdongnan Basin, where water depth is more than 600 m, the thickness of the hydrate stability zone is more than 100 m; the thickest GHSZ is located in the northwest of the study area, with a maximum thickness of more than 300 m; it is a favorable hydrate exploration area; (3) the methane GHSZ has gone through stable stage, relatively quick incrassation, gently changing stage, and quickly attenuating and recovery stage since 1.05 Ma BP. There is a good superposition relationship between the pockmark group and the sensitive area of GHSZ. Combined with previous research results, it is concluded that their formation is related to the decomposition and release of natural gas hydrate.

gas hydrate  /  thickness of gas hydrate stable zones  /  distribution  /  evolution  /  Huaguang Sag  /  Qiongdongnan Basin
Jie Liu, Rui Yang, Daidai Wu, Guangrong Jin, Hui Zhang. Factors affecting the thickness of gas hydrate stability zones in the Huaguang Sag, Qiongdongnan Basin[J]. Haiyang Xuebao, 2019 , 41 (8) : 13 -25 . DOI: 10.3969/j.issn.0253-4193.2019.08.002
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Article Info
doi: 10.3969/j.issn.0253-4193.2019.08.002
  • Receive Date：2018-12-04
  • Online Date：2026-04-03
  • Published：2019-08-25
Article Data
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History
  • Received：2018-12-04
  • Revised：2019-03-11
Funding
Affiliations
    1 Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Science, Guangzhou 510640, China
    2 Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 511458, China
    3 Qingdao Institute of Marine Geology, Qingdao 266071, China
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
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光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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