Coal reservoirs in Zhijin and Nayong regions of China have high gas adsorption capacities due to their metamorphism levels. However, low seepage capacities and hypertonic conditions hinder coalbed methane output. Burial metamorphism increased adsorption capacities but decreased seepage capacities. Tectonic movements in the Yanshanian period improved both adsorption and seepage capacities near fault zones. Pore structures are dominated by adsorption pores, with poorly developed seepage pores and low microfracture density. Faults and magma intrusion near fault zones increased porosity and permeability, while later mineralization reduced them, making CBM extraction challenging.