The test results of three dense well net regions in Daqing Oilfields indicate that sedimentary microfacies is the main factor influencing the planar distribution of residual oil.In large channel sand bodies

the residual oil is mainly distributed in the places with poor physical property;in distributary channel sand bodies

the oil is usually preserved in thin sand laminaes and sand lens.The top part of thick oil horizon favours the enrichment of residual oil

and exploration factor also has some influence on the distribution of risidial oil.