<p>The article presents the results of a computational experiment aimed at obtaining criteria for selecting geological structures for creating an underground natural gases storage facility and burial carbon dioxide in a hydrated state in subpermafrost aquifier. A mathematical model of gas injection through a single well into a horizontal water-saturated formation under permafrost rocks is presented, which takes into account all the main physical and thermodynamic features of the hydrate formation process. A comparison of the calculation results for the dynamics of distribution of temperature, pressure, water saturation, and hydrate saturation is carried out. Examples of numerical calculation of gas injection into a formation with an initial water saturation of 0.9, porosity of 0.15, and permeability of 8·10^–13 m² are considered. The variable parameters are the volumetric flow rate of the injected gas and equilibrium conditions of hydrate formation. The influence of the equilibrium conditions of hydrate formation on the main indicator of the process efficiency — hydrate saturation of the created storage facility — is shown. The results of laboratory experiments to determine the equilibrium conditions for the formation of hydrates of natural and carbon dioxide gases in porous media and in aqueous solutions simulating formation waters of subpermafrost horizons were used to conduct computational experiments. It was revealed that for the creation of an underground storage facility, it is preferable to choose a formation with a sodium bicarbonate type of water, rather than with fresh water.</p>