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Gas hydrate stability zone in Muri coalfield, Qinghai Province, China

Published online by Cambridge University Press:  29 November 2021

Jing LI Open the ORCID record for Jing LI [Opens in a new window] ,
Zheng YAO ,
Hongbo ZHAO  and
Zewei WANG
Jing LI*
Affiliation:
Shanxi Institute of Energy, Jinzhong 030600, China.
Zheng YAO
Affiliation:
Shaanxi Institute of Geological Survey, Xi'an 710054, China.
Hongbo ZHAO
Affiliation:
Shanxi Institute of Energy, Jinzhong 030600, China.
Zewei WANG
Affiliation:
Hebei University of Engineering, Handan 056038, China.
*
*Corresponding author. Email: [email protected]
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Abstract

The gas hydrate stability zone (GHSZ) is the essential condition for gas hydrate accumulation, which is controlled by three main factors: gas component, geothermal gradient and permafrost thickness. Based on the gas component of hydrate samples from drilling in Muri coalfield, the gas hydrate phase equilibrium curve was calculated using Sloan's natural gas hydrate phase equilibrium procedure (CSMHYD) program. Through temperature data processing of coalfield boreholes, some important data such as thickness of permafrost and geothermal gradient were obtained. The GHSZ parameters of a single borehole were calculated by programming based on the above basic data. The average thickness of GHSZ of 85 boreholes in Muri coalfield amounted to approximately 1000 m, indicating very broad space for gas hydrate occurrence. The isogram of GHSZ bottom depth drawn from single borehole data in Muri coalfield demonstrated the regional distribution characteristics of GHSZ, and identified three favourable areas of gas hydrate occurrence where the bottom of GHSZ had a burial depth >1500 m – namely, the southern part of Juhugeng Mining Area, the middle part of Duosuogongma Mining Area and the eastern part of Xuehuoli Mining Area.

Keywords

mid and low latitude regionspermafrost areagas hydratestability
Type
Articles
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 113 , Issue 1 , March 2022 , pp. 7 - 12
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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