This research paper examines various features of the formation of gas hydrates in a porous medium during an injection of cold gas (the injected gas temperature is lower than the initial temperature of the porous medium). Self-similar solutions of this problem were built in a rectilinear-parallel approximation. These solutions explain the distribution of the main parameters in a porous medium during the formation of gas hydrates on a frontal surface as well as in an extended zone. (C) 2015 Elsevier Ltd. All rights reserved.