The three-dimensional model is established with the numerical simulation software TOUGH2 of flow and heat migration, through a constant speed with long time of injecting fluids containing CO ₂ to simulate CO ₂ geological storage research on the effect of formation temperature. The results show that the formation temperature is in equilibrium before CO ₂ geological storage and the original balance is broken after sealing up. The higher the formation permeability is, the more conducive to the exchange of temperature. The temperature of whole formation undergoes the process from unsteady state to steady state, and because the exchange of formation temperature is restricted by the energy conservation, the final temperature of the whole formation is about at the initial time and the middle temperature of the lower formation temperature. The injected fluid continuously has a limited influence on the formation temperature, and the formation temperature changes rapidly in the early, the late change rate gradually slows down.

Gas belongs to flammable and explosive hazardous gas. When the leakage of gas occurred in limited indoor space, the serious consequences would be produced. According to the characteristics of the gas leakage diffusion, firstly Gambit was established indoor gas stove nozzle dispersion physical model. Secondly CFD fluid dynamics software FLUENT was used to simulate the diffusion process of continuous leakage. Finally comparing the diffusion results under certain temperature gradient but different moisture conditions, and monitoring the specified installation area with variety of mounting points, the aim was to optimize the installation position of the alarm. The results show that the location of distance and relative humidity of indoor air were both the key factors on affecting the alarm time. For the same mounting points, relative air humidity increasing 15% would cause delaying the time of alarm nearly 6 s| under the same air relative humidity, each time the alarm was away from the leaking mouth increasing by 1metre, alarm time would lag for 4 s.