Abstract: 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.