ИСТИНА

At present, on the north West Siberia (Yamal Peninsula) there are some unusual craters, associated with gas release from permafrost. One of the possible mechanism is the freezing of the gas-saturated talik and increasing gas pressure up to 1.5 - 2.0 MPa with a gas blowout and crater formation. In this connection the thermodynamic technique of freezing temperature calculation of gas-saturated pore water under the gas pressure is developed. Methane, carbon dioxide and their mixtures are considered. It is shown that the solubility of gases in water should be taken into account when pressure build-up during the freezing of gas-saturated talik zones (especially when carbon dioxide is present in the gas phase). The influence of three factors on the freezing point of a gas-saturated water is analyzed: the external pressure created by the gas, the presence of a gas dissolved in water and the water mineralization.