Abstract: The reservoir sandbody of Dujiatai oil formation in the study area can be genetically attributed to anear-sourced and rapidly accumulated fan delta.The main types of reservoir rocks include fine gravelstone,inequigranular sandstone,sandstone and siltstone.Different types of rocks differ significantly inphysical properties.The analytical results of rocks with such a genesis can be middle-low permeabilityreservoirs,and there exists a certain correlative relation among their lithologic characteristics,physicalproperties,electricity and oil potentials;moreover,a direct correlation between porosity and permeabilityis recognized.Obviously the distribution of the reservoir rocks are controlled by sedimentary microfacies.