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EFFECT OF GAS COMPOSITION AND PRESSURE ON PORE WATER FREEZING POINT IN GAS-SATURATED SEDIMENTS: AN EXPERIMENTAL STUDYстатья
- Авторы: Chuvilin E.M., Davletshina D.A., Bukhanov B.A., Grebenkin S.I., Istomin V.A., Sergeeva D.V., Badetz Ch, Stanilovskaya J.V.
- Журнал: Kriosfera Zemli (Earth's Cryosphere)
- Том: 23
- Номер: 5
- Год издания: 2019
- Первая страница: 44
- Последняя страница: 49
- DOI: 10.21782/EC2541-9994-2019-5(44-49)
- Аннотация: Confi ned freezing of pore water in gas-saturated sediments under gas pressure associated with cryogenic gas concentration is studied experimentally. The behavior of pore water freezing temperature in pressurized sediments is modeled for diff erent saturating gases: nitrogen, methane, carbon dioxide, and a CH4 + CO2 (1:1) mixture. Natural sand and silt samples from permafrost are frozen in laboratory in a specially designed system which can record temperature change in heated and frozen gas-saturated soil samples under gas pressure specifi ed to be below the level of gas hydrate stability. The freezing point of pore water shows dependence on the gas pressure and composition. The changes of the freezing temperature are notable if the saturating gases are highly soluble (carbon dioxide), but the presence of salt ions reduces the eff ect. Poorly soluble gases, such as nitrogen and methane, can provide no more than 0.1 °C/MPa reduction of the freezing point unless carbon dioxide is present in the pores, which increases the coeffi cient to 1.36 °C/MPa. The experimentally estimated eff ect of gas pressure on the freezing temperature of pore water agrees with the results of thermodynamic calculations based on pore water activity.
- Добавил в систему: Чувилин Евгений Михайлович
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | paper | Chuvilin_et_al_2019_Effect_of_gas_composition.pdf | 264,5 КБ | 22 февраля 2020 [EChuvilin] |