A simplified permeability model for coalbed methane reservoirs based on matchstick strain and constant volume theory

►A new permeability prediction model for a coalbed methane reservoir is proposed. ►The model basis is volumetric balance between bulk and solid coal and pores. ►Model uses constant volume theory. ►Results suggest good agreement with predicted permeability using existing models. ►The model is simple. All input parameters are easily measurable.