Study on the Main Controlling Factors of Tight Oil Accumulation in Carbonate Conglomerate——Taking the Conglomerate Reservoir of the Lower 3^rd Member of Shahejie Formation in Shulu Sag as an Example

Based on the seismic data, logging, core analysis and testing, this paper discusses the reservoir forming characteristics,the main controlling factors and favorable exploration direction of the tight oil in carbonate conglomerate.The results show that the conglomerate in the lower 3rd member of Shulu saghas mixed terrigenous and endogenous characteristics.Marl source rocks,interbedded with conglomerate,with large thickness, wide distribution and high organic matter abundance, provide a material basis for the formation of tight conglomerate oil reservoirs.The faults have some effects on the formation of tight conglomerate oil reservoirs.In conclusion, high-quality source rocks,degree of the reservoir developmentand favorable reverse fault traps are the main controlling factors for tight conglomerate oil accumulation.The accumulation mode is "source-reservoir symbiosis".It is suggested that the future exploration should be near the marlite hydrocarbon-generating center and far from the fault development zone,being in the gravel body of slump fan origin near the slope break zone.