Multi-field coupling deformation of rock and multi-scale flow of gas in shale gas extraction

Shale is a kind of multi-scale medium to store shale gas. The analysis of its structural changes during gas extraction is helpful to increase shale gas production. In this study, the shale reservoir is divided into three systems according to the scale: kerogen system, pore system and fracture system. Based on the fractal geometry theory, the fractal permeability models of the pore system and fracture system are established according to the...