大民屯凹陷变质岩潜山油水分布与成藏类型探讨

Oil-water distribution of metamorphic buried hill and reservoir type discussion of Damintun sag

变质岩潜山油藏复杂的储集空间决定了勘探开发过程中油水分布关系的复杂性。以整个大民屯变质岩潜山为研究对象,打破了传统仅限于某个区块边勘探边研究边认识的思路,从整个变质岩潜山地层水水性及在勘探开发中的特点论述了边水推进的依据,建立了变质岩潜山边水推进模式,认为变质岩潜山地层水分布以荣胜堡洼陷为中心,以边水推进模式沿优势运移通道推进,随着能量的减弱,到凹陷北部基本没有边水。同时,根据边水推进模式下油水关系的规律性与储集空间展布的复杂性,探索出了上油下油型、上油下水型、上干下油型、低油高水型四类典型的成藏类型,拓展了潜山的勘探领域,指导了大民屯凹陷变质岩潜山的勘探开发。

The complexity of oil- water distribution is determined by the complex reservoir spacing of metamorphic buried hill.By taking the metamorphic buried hill of Damintun sag as the example,breaking the traditional idea of researching while exploration,the properties of formation water of the whole metamorphic buried hill,their characteristics in exploration and development and the edge water propulsion have been discussed,and the edge water propulsion mode of the metamorphic buried hill has been established.The analysis shows that formation water distribution of the metamorphic buried hill is centered on Rongshengpu sag,with the edge water propulsion mode to promote along the advantages of migration pathways,and with the weakening of the energy,there is basically no edge water in northern sag.Meanwhile,according to the regularity of the oil-water relationship with the edge water propulsion mode and complexity of reservoir spacing,four types of reservoir accumulation have been explored,namely upper oil- lower oil,upper oil- lower water,upper dry-lower oil,and lower oil-higher water types,which expands the exploration boundary of buried hill and provides good guidance for the exploration of metamorphic buried hill of Damintun sag.