Time evolution of (a) gas pressure, (b) hydrate saturation, (c) temperature distributions at 6 and 36 months after initiation of CO₂ injection, and (d) total mass of CO₂ gas injected after 40 months of injection for three different values of initial water saturation (S _w0) in porous layer. Injection parameters are same as given in Table 1 except S _w0. (Test cases 5–7).