LAUSR

A number of potential gas reserves are present in shale reservoirs around the world. The gas production process is more complex in shale reservoirs than in conventional reservoirs, mainly because of the ultralow permeability of the matrix, complex pore structure, and organic components that cause desorption. Long-term gas production comes from both free gas expansion and adsorbed gas desorption. In addition to the estimation of the gas content reserve in a reservoir, an accurate description of the effect of adsorbed gas on the dynamic gas production process is meaningful for predicting gas production from shale. Experimental and mathematical efforts have been undertaken to obtain an accurate description of the gas production process. This paper investigates desorption and diffusion, which are two of the key mechanisms in the shale matrix during gas production. The experimental results suggest that the gas production process from shale can be divided into two stages: free gas expansion from inorganic micro...