Factors affecting the thickness of gas hydrate stability zones in the Huaguang Sag, Qiongdongnan Basin

Liu Jie; Yang Rui; Wu Daidai; Jin Guangrong; Zhang Hui

doi:10.3969/j.issn.0253-4193.2019.08.002

Volume 41 Issue 8

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Liu Jie，Yang Rui，Wu Daidai, et al. 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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Factors affecting the thickness of gas hydrate stability zones in the Huaguang Sag, Qiongdongnan Basin

doi: 10.3969/j.issn.0253-4193.2019.08.002

Liu Jie^{1, 2
,},
Yang Rui³,
Wu Daidai^{1, 2},
Jin Guangrong¹,
Zhang Hui¹

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

Received Date: 2018-12-04
Rev Recd Date: 2019-03-11

Available Online: 2021-04-21

Publish Date: 2019-08-25

Abstract

Abstract

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

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