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Taking oil sand reservoir in Upper Cretaceous of the western slope in Songliao Basin as an example�� we found that the sand bodies of delta front are developed and the heterogeneity of oil sand reservoirs are serious in the study area�� By comparison with conventional oil-gas reservoir��the in-layer heterogeneity is stronger than plane and interlayer heterogeneity even the controlling factors of oil sands reservoir heterogeneity are different�� The prediction of hydrocarbon migration channels is based on the parameters of reservoir heterogeneity�� The study results demonstrate that the lower part of underwater distributing channels and the coarse grain of mouth bars are the main migration channels on the background of simple slope structure without fault�� The sand bodies of distal bars and sheet sands do not have the connectivity or hydrocarbon migration conditions because of mudstone barriers��interbeds�� poor physics property and thin sandstone��