关键词: 叠加盆地, 古隆起, 隆起旋回, 成因机制, 成藏条件, 油气分布规律

Abstract: Uplift is a large-scale positive structural element of sedimentary basin and has strong influences on the structural evolution,depositional system and fluid flow in the basin.Uplift has the poly-mechanism in its generation.The extension,compression and strike-slipping environments can give rise to the formation of uplift.With the transition of geodynamic settings,the varied primary-generated uplifts may show the distinct characteristic of superposition owing to the combination of the above-mentioned mechanisms and entitle a kind of much complicated structure and configuration.The evolution of uplift has undergone a process from the formation-period (or embryo-period),growing-period to mature-period and then succeeding,decreasing gradually or disappearing in the end.This process can be called as uplift cycle.Uplift can thus show a shape of any accordingly period of such a developing process.The existing uplift today is in some periods of growing.Uplift is an important area for oil and gas accumulated in petroliferous basin and has great influences upon pool-formation.The uplift during deposition period has restricted the development of the source rock-reservoir rock-cap rock assemblages.The uplift during reservoir-forming period controlled oil-gas accumulation.The uplift during adjusting period or modifying period governed the re-distribution of oil and gas,and the uplift during perching period or burying period controlled the position of oil-gas occurrence.The sedimentary basins are largely the superimposition of proto-type basins in different periods.The poly-history superposition has resulted in the favorable functions on uplift,such as intervals of the multiple oil and gas-bearing in paleo-highs,additional hydrocarbon plays exactly above or below superimposition contacts,large-scale oil-gas accumulation zones resulted from the multi-period charging and accumulation of hydrocarbon and increase of pool-forming probabilities in the uplift,or the generation of the fault-dominated oil-gas accumulation zones owing to the linkage among faults of different periods and the multiple independent petroliferous zones separated by the sealing beds of a later petrogenic origin.The axial and slope zones of the uplifts are favorable for generating a large-scale oil-gas accumulation dominated by the anticline and the lithologic-stratigraphic reservoirs respectively.

Key words: superimposed basin, paleo-uplift, uplift cycle, genetic mechanism, pool-formation conditions, oil-gas occurrence