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

Chuvilin, E.; Ekomova, V.; Davletshina, D.; Bukhanov, B.; Krivokhat, E.; Shilenkov, V.

Авторы: Chuvilin Evgeny, Ekomova Valentina, Davletshina Dinara, Bukhanov Boris, Krivokhat Ekaterina, Shilenkov Vladimir
Журнал: Geosciences (Switzerland)
Том: 12
Номер: 261
Год издания: 2022
Издательство: MDPI Publishing
Местоположение издательства: Basel, Switzerland, Switzerland
DOI: 10.3390/geosciences12070261
Аннотация: 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 temperature, ~-6 oC 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.
Добавил в систему: Чувилин Евгений Михайлович

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

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