Temperature Variation during Salt Migration in Frozen Hydrate-Bearing Sediments: Experimental Modeling

Evgeny Chuvilin, Valentina Ekimova, Dinara Davletshina, Boris Bukhanov, Ekaterina Krivokhat, Vladimir Shilenkov

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Salt migration may be another reason why pore-gas hydrates dissociate in permafrost, besides pressure and temperature changes. Temperature variations in frozen hydrate-saturated sediments interacting with a NaCl solution have been studied experimentally at a constant tem-perature, ~−6C typical for permafrost. The experiments with frozen sandy samples containing metastable methane hydrate show that the migration of Na+ ions in the NaCl solution and their accumulation in the sediments can induce heat-consuming hydrate dissociation and ice melting. The hydrate-saturated frozen soils cool down at higher rates than their hydrate-free counterparts and require more time to recover their initial temperature. The temperature effects in hydrate-saturated frozen sediments exposed to contact with NaCl solutions depend strongly on salt concentration. The experimental results are used to model phase changes in the pore space associated with salt-ions transport and provide insights into the reasons for temperature changes.

Original languageEnglish
Article number261
JournalGeosciences (Switzerland)
Volume12
Issue number7
DOIs
Publication statusPublished - Jul 2022

Keywords

  • frozen sediment
  • gas hydrate
  • hydrate dissociation
  • methane emission
  • permafrost
  • salt migration
  • temperature variation

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