Abstract: Taking the 9~1 stratum of Es-2 in Tuo-7 block of Shengtuo oilfield as an example,intraformational rhyth- micity,interformational difference,barrier and interbed were studied in this paper.The results reveal that reser- voir heterogeneity was controlled by sedimentary facies, the distribution of sandy body and interbed.The distribu- tion of remaining oil affected by reservoir heterogeneity is as follows,the remaining oil mainly distributes in the bad physical property or voidage-injection imbalanced reser- voir and also in the negative main stream line or the bad permeability lateral margin facies belt on the plane.