Zhanhua sag has the characteristics of“multi-sub-sag with multi-hydrocarbon-source，multi-stage hydrocarbon charging and accumulation and mixed sources of multi-sub-sag”. In accordance with the above characteristics，based on the division of sub-structural units，from source rocks to petroleum reservoirs，oil-source correlation techniques was applied to analyze and determine the hydrocarbon supplying range of source rocks of different sub-sags，the pathways and processes of hydrocarbon-migrating and the exploration potential of different structural belts. On the basis of the analyses，a composite petroleum accumulation belt with similar sources and migration pathways and reservoir-forming characteristics was defined as a multi-source-supply reservoir-forming unit，and four classifications and seven units were classified and divided totally. The types are single sub-sag with single hydrocarbon source，multi-sub-sag with multi-ydrocarbonsource，single sub-sag with multiple hydrocarbon sources，multi-sub-sag with single hydrocarbon-source，and the units are the Yidong-Chengnan unit with single sub-sag and multiple hydrocarbon sources，the Changdi-north Gudong-Kendong uplift unit with multi-sub-sag and multi-hydrocarbon-source，the Chenjiazhuang-Kenxi unit with single sub-sag and multiple hydrocarbon sources，the Shaojia-Bonnan-Gubei unit with single sub-sag and single hydrocarbon source，the Gunan-Fulin unit with single sub-sag and single hydrocarbon source，the Gudao unit with multi-sub-sag and multi-hydrocarbon-source，the south Gudong-west Kendong unit with single sub-sag and multiple hydrocarbon sources. It also indicates that the type and characteristics of different units are determined by multi-migration pathways and petroleum sources of the sub-sags. The research on multi-source supply reservoir-forming units has great exploration significance. On one hand，the remaining resource potential is clear by applying oil-source correlation techniques；on the other hand，the petroleum exploration potential area can be predicted based on the integrated study of migration pathways and directions and trap development laws.