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Volume 35 Issue 6
Dec 2024
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Article Contents
Zhenhua Han, Ruirui Li, Luqing Zhang, Jian Zhou, Song Wang. Multi-field Coupling Simulation of Impact of Temperature and Density of Heat Injection Well on Carbon Budget during Hydrate Exploitation in Qilian Mountain Permafrost Region. Journal of Earth Science, 2024, 35(6): 1934-1943. doi: 10.1007/s12583-023-1947-5
Citation: Zhenhua Han, Ruirui Li, Luqing Zhang, Jian Zhou, Song Wang. Multi-field Coupling Simulation of Impact of Temperature and Density of Heat Injection Well on Carbon Budget during Hydrate Exploitation in Qilian Mountain Permafrost Region. Journal of Earth Science, 2024, 35(6): 1934-1943. doi: 10.1007/s12583-023-1947-5

Multi-field Coupling Simulation of Impact of Temperature and Density of Heat Injection Well on Carbon Budget during Hydrate Exploitation in Qilian Mountain Permafrost Region

doi: 10.1007/s12583-023-1947-5
More Information
  • Corresponding author: Zhenhua Han, hanzhenhua@mail.iggcas.ac.cn
  • Received Date: 27 Jun 2023
  • Accepted Date: 27 Sep 2023
  • Available Online: 26 Dec 2024
  • Issue Publish Date: 30 Dec 2024
  • Permafrost regions of Qilian Mountains in China are rich in gas hydrate resources. Once greenhouse gases in deep frozen layer are released into the atmosphere during hydrate mining, a series of negative consequences occur. This study aims to evaluate the impact of hydrate thermal exploitation on regional permafrost and carbon budgets based on a multi-physical field coupling simulation. The results indicate that the permeability of the frozen soil is anisotropic, and the low permeability frozen layer can seal the methane gas in the natural state. Heat injection mining of hydrates causes the continuous melting of permafrost and the escape of methane gas, which transforms the regional permafrost from a carbon sink to a carbon source. A higher injection temperature concentrates the heat and causes uneven melting of the upper frozen layer, which provides a dominant channel for methane gas and results in increased methane emissions. However, dense heat injection wells cause more uniform melting of the lower permafrost layer, and the melting zone does not extend to the upper low permeability formation, which cannot provide advantageous channels for methane gas. Therefore, a reasonable and dense number of heat injection wells can reduce the risk of greenhouse gas emissions during hydrate exploitation.

     

  • Conflict of Interest
    The authors declare that they have no conflict of interest.
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