Abstract: The cumulative effective thickness of the interbeded heavy oil reservoirs in Jinglou,Gucheng oilfield is up to 5～20m.After over 20 years of development,due to the severe reservoir heterogeneity,the producing level of reserves are uneven in plane;the producing level of steam stimulation is high in highly permeable layers and residual oil mainly accumulated in medium and low permeable layers in vertical.The residual oil mainly distributed in the regions with low level of controlling well pattern,lateral side of distributary channel or the gulf between the distributary channel in plane.So as for the residual oil potential,we should make clear the distribution of residual oil,take effective measures to improve the utilization of existing resources under the circumstance of lack of backup resources.So it is very important for the continuous stable production of heavy oil.