Based on the core analysis and microscopic observation，it is believed that the rocks of Chang 6 reservoir are mainly composed of arkose with lOW compositional maturity and medium texture maturity．Reservoir properties are mainly low porosity and low-super low permeability．The reservoir distribution is mainly controlled by sedimentary facies．The sedimentation type is mainly delta front subfacies．Subaqueous distributary channel and mouth bar sand bodies are the main reservoirs．The denudation of laumontite developed well in Chang 6 reservoir，which plays a key role to the reservoir improvement．