大民屯凹陷太古宇油气富集主控因素研究

Study on Controlling Factors of Hydrocarbon Enrichment in Archeozoic Reservoir of Damintun Sag

在储集岩和烃源岩发育的基础上,大民屯凹陷太古宇潜山中油气富集受断裂控制。断裂活动控制了潜山的形成和储层裂缝的发育程度,并在油气运-聚过程中起主导作用;断裂的性质和规模控制了油气富集程度,逆断层控制形成的潜山油气最为富集,大断距正断层的两盘均可形成油气富集区块。

Being the favorable conditions of reservoir and source rock, hydrocarbon accumulation of Archaeozoic buried hill is controlled by fault activity in Damintun sag. Faults not only are crucial factor for the formation of the buried hills and the fractures, but also play dominant role in the process of hydrocarbon migration and accumulation. In addition, the degree of hydrocarbon enrichment is closely connected with characteristics and scale of the faults. In the upper wall of the thrust fault, hydrocarbon is the most abundant, thus the two walls of the big heave normal fault are both hydrocarbon enrichment blocks.