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Abstract: The research on the correlation between hydrocarbon accumulations and magmatic activities has always attracted aroused much wide attention. Existing research has primarily the hydrocarbon generations capability of source rocks and the quality of reservoirs by diabase intrusions. whereas, rare systematic research has been conducted on the oiliness and enrichment mechanism. To be specific, the diabase intrusive zone, the contact metamorphic zone and the normal shale zone of the Funing Formation in the Gaoyou Sag, Subei Basin were taken as the object of this study. Moreover, in this study, the hydrocarbon generation quality, reservoir quality, and oil-bearing quality of diabase-metamorphic zone-normal shale were evaluated using X-ray diffractions, argon ion polishing-field emission scanning electron microscope, energy spectrum, rock slice/light-sheet microscopic observations, organic geochemical tests, N2 gas adsorption and 2D NMR tests. The results indicated that the intrusive zone, the metamorphic zone, and the normal zone were formed in order by the degree of effect of diabase intrusions. Secondly, the oil content of different parts exhibited significant heterogeneity due to the baking effect of diabase, and the metamorphic zone had the significantly better oil-bearing nature than the intrusive zone. Lastly, a distribution model was proposed for the diabase intrusive zone-metamorphic zone-normal surrounding rock zone.