Abstract: Chunguang exploration area is a hydrocarbon accumulation area outside the oil source area,and the oil source area is in the east of Changji sag and in the south of Sikeshu sag in Permian and Jurassic.Cretaceous reservoirs are mainly of stratigraphic unconformity reservoirs,including heavy and intermediate of heavy oil reservoir.Through the study on oil source conditions,the oil source characteristics of the cretaceous reservoirs have been determined.Through conducting system research,the unconformity and fault of cretaceous petroleum have been determined.Through the research of sedimentary reservoir characteristics,the delta and beach bar underwater distributary channel sand body have been determined to be the favorable reservoir facies belt.Through hydrocarbon accumulation stage research,two hydrocarbon accumulation phases have been determined.Comprehensive research believes that the efficient transportation systems,the stratigraphic pinchout sand group line distribution range and high quality reservoirs are main controlling factors of cretaceous stratigraphic reservoir accumulation.