Pressure Pulse Transmission and Reflection from Layer in Porous Medium with Variable Initial Content of Gas Hydrate

Gas hydrate is formed in a porous medium in the presence of water, a hydrate-forming gas, and suitable pressure and temperature conditions. On land, these can be zones of permafrost, or bottom areas of oceans, seas and lakes. The distribution of hydrate in the reservoir may be non-uniform, for example, its content may increase or decrease with depth. It is of interest to study how the distribution of hydrate content affects the behavior of the compression impulse. This work aims to study such a problem. A two-velocity model of a porous medium is used for calculations, while the skeleton is considered to consist of grains cemented with gas hydrate. The influence of distribution of hydrate saturation, the duration of the initial pulse and the length of the hydrate-containing layer on the characteristics of the transmission and reflection of pulse waves has been studied.