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The study of shale gas seepage mechanism can provide theoretical basis for the production capacity evaluation and prediction of shale gas reservoir. The shale gas permeability model is an important part of the theoretical research of shale gas seepage. In this paper, the spring system model is applied to the shale reservoir, and the shale reservoir is simplified as the ideal dual porosity medium model. By analyzing and considering the influence of adsorption layer, diffusion, seepage, matrix deformation and slippage, the dual porosity permeability model of shale gas under various factors is given. In addition, the model is compared with the Civan permeability model and permeability experiment to verify its rationality. The results show that the model proposed in this paper is reasonable and reliable. The model has certain theoretical and practical significance for perfecting the theory of shale gas seepage flow.

A Flow - Solid Coupling Permeability Model of Shale Gas Reservoir Based on Dual Media