Hydrocarbon accumulation characteristics of complex reservoirs outside the source area in Chunguang oilfield

Chunguang oilfield is a complex oil and gas accumulation area with multi-oil supplies, multi-transport systems and multi-oil products. Effective source rocks are not developed locally in the Chaipaizi uplift, and the hydrocarbon supply distance is about tens to hundreds of kilometers, which is a typical reservoir outside the source area. As a result, the reservoir forming conditions in Chunguang oil field are complex, and the identification of hydrocarbon traps is difficult, and the reservoir forming characteristics are unique. Based on the analysis of oil and gas sources, the oil and gas transmission systems are analyzed from three aspects of fault, sand plate and unconformity surface. The reservoir forming model of key oil-bearing well area is established, and the characteristics of oil and gas accumulation are summarized. The results show that Chunguang oilfield has obvious characteristics of 'bidirectional hydrocarbon supply', and oil and gas transport and accumulation mainly through the compound transport system composed of unconformity surface, plate sand and fault surface.