PRELIMINARY STUDY ON THE DISTRIBUTION PATTERN OF GAS HYDRATE STABILITY ZONE IN THE DEEP-WATER AREAS OF QIONGDONGNAN BASIN

MAO Xuelian; ZHU Jitian; SONG Peng; GUO Minggang; HUANG Shizhuo

doi:10.16028/j.1009-2722.2021.086

2021 Vol. 37, No. 10

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Article navigation > Marine Geology Frontiers > 2021 > 37(10): 58-63

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MAO Xuelian, ZHU Jitian, SONG Peng, GUO Minggang, HUANG Shizhuo. PRELIMINARY STUDY ON THE DISTRIBUTION PATTERN OF GAS HYDRATE STABILITY ZONE IN THE DEEP-WATER AREAS OF QIONGDONGNAN BASIN[J]. Marine Geology Frontiers, 2021, 37(10): 58-63. doi: 10.16028/j.1009-2722.2021.086

Citation:

MAO Xuelian, ZHU Jitian, SONG Peng, GUO Minggang, HUANG Shizhuo. PRELIMINARY STUDY ON THE DISTRIBUTION PATTERN OF GAS HYDRATE STABILITY ZONE IN THE DEEP-WATER AREAS OF QIONGDONGNAN BASIN[J]. Marine Geology Frontiers, 2021, 37(10): 58-63. doi: 10.16028/j.1009-2722.2021.086

PRELIMINARY STUDY ON THE DISTRIBUTION PATTERN OF GAS HYDRATE STABILITY ZONE IN THE DEEP-WATER AREAS OF QIONGDONGNAN BASIN

Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, China

Received Date: 08 April 2021

Publish Date: 28 October 2021

Abstract

Abstract

The formation and accumulation of gas hydrate are strictly depending on temperature and pressure, or so-called the stable region of low temperature and high pressure, which directly determines the distribution pattern and scale of the gas hydrate deposits. In this paper, according to Bono Malev's empirical formula, the hydrate stability zone of the deep-water areas of the Qiongdongnan Basin is calculated with three key parameters, namely the gas composition, the geothermal gradient and the water depth. Based on the distribution pattern of the hydrate stability zone of the Qiongdongnan Basin, it is found that the greater the water depth (pressure) and the smaller the geothermal gradient, the greater the hydrate stable thickness. When the water depth reaches 334.1 m, the hydrate stability zone is formed on the seabed. With regards to the general distribution pattern of the hydrate stability zone in the Qiongdongnan Basin, it is thin in the north and south, thick in the middle, and gradually becomes thicker from west to East. The thickness of the zone changes between 200～300 m with a maximum up to 400 m.
- gas hydrate /
- hydrate stability zone /
- Bono Malev’s method /
- Qiongdongnan Basin

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