Abstract: Based on the occurrence and migration law of coalbed methane, and the analysis of coalbed methane desorption from matrix of coal by way of channeling and diffusion, through the process from which the cleat to the production borehole by way of permeation and diffusion, then coupling the unequilibrium adsorption model of coalbed methane in the Millipore with gas-water two-phase percolation model together, the Dual media coalbed methane reservoir simulation steady state percolation mathematical model is formed. A homologous numerical model is established according the ADI-FDTD method. For channeling and diffusion method, we make a research on their influences on development effectiveness based on this model. The results show that channeling and diffusion have greater influences on gas production in the late period. The greater the channeling factor or diffusion coefficient are, the higher the gas production is.

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