Shallow secondary gas reservoir and heavy oil reservoir mostly distribute in the periphery of source sub-sag，uplift belt and central uplift belt of in Jiyang depression. Based on the study of geology and geochemistry study in Jiyang depression，the relationship between the shallow gas reservoir and heavy oil reservoir were discussed through gas sources and genesis，thickening mechanism of heavy oil，dynamic balance between natural gas migration and accumulation and distribution pattern of shallow secondary gas reservoir and heavy oil reservoir. The results show that the shallow secondary gas reservoir is associated with the heavy oil reservoir，and the petroleum biodegradation and dissolved gas in the heavy oil reservoir provide its gas source. There are three evident distribution patterns：①Heavy oil reservoirs often develop below or along the downdip direction of shallow secondary gas reservoirs；②Shallow secondary gas reservoirs may not exist above or along the updip direction of heavy oil reservoirs；③No shallow secondary gas reservoirs exist above or along the updip direction of conventional oil reservoirs. The shallow gas reservoir and heavy oil reservoir formed a relatively independent system of hydrocarbon generation，migration and accumulation.