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Pressure Influence on Salt Migration in Frozen Hydrate-Saturated Sediments: Experimental Modelingстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Chuvilin Evgeny, Ekimova Valentina, Davletshina Danara, Krivokhat Ekaterina, Shilenkov Vladimir, Bukhanov Boris
- Журнал: Energy and Fuels
- Год издания: 2022
- Издательство: American Chemical Society
- Местоположение издательства: United States
- DOI: 10.1021/acs.energyfuels.2c01282
- Аннотация: Development of the Arctic region faces many problems, including methane emission from permafrost. Among other causes, methane emission may result from destabilization and dissociation of intrapermafrost gas hydrates under temperature and pressure changes or chemical reactions. The effects of the temperature and pressure on the stability of intrapermafrost gas hydrates have beenquite well-studied, but the chemical effects, such as migration of salts, remain poorly understood. In this study, the interaction of frozen hydrate-saturated sediments with NaCl solutions is simulated in physical experiments at different gas pressures from 0.1 to 4.0 MPa and at a constant negative temperature of around −6.0 °C.The experiments show that the external pressure significantly affects the migration of Na+ into frozen hydrate-bearing sand: salt transport accelerates at lower pressures, while pore hydrates lose stability. However, the effect of the pressure on frozen hydrate-free sediments is minor. The experimental results make a basis for amodel of pore space changes in frozen hydrate-saturated rocks interacting with salt water under gas pressures above or below the equilibrium value.
- Добавил в систему: Чувилин Евгений Михайлович