Abstract: In order to evaluate reservoir and support scientific de-velopment in oilfield,estimate the micro and macro hetero-geneity of Chang 6 reservoir in Sai 130 well area of Ansai oil-field,and make a research on the relationship of the hetero-geneity of inner layer,interlayer and horizons and remaining oil distribution,based on the studies of reservoir sedimentary facies.the micro and macro heterogeneity of Chang 6 reser-voir have been studied by using the result of well the data of cores,analysis of mercury penetration,logging interpreta-tion. The results show that the in layer heterogeneity and in-ter layer heterogeneity of Chang 6 reservoir and the micro and flat heterogeneity are medium. Remaining oil is mainly in Chang 611-2 and Chang 611-3 sublayer,and all of them are main targets for next potential exploration.