关键词: 压性浅水湖盆, 层序地层, 隐蔽油气藏, 勘探实践, 吐鲁番拗陷

Abstract:

In middle and lower Jurassic of Turpan sag，high-precision sequence stratigraphic framework is built up and five third-order sequences and ten fourth-order sequences are divided by applying sequence stratigraphy and sedimentology principles and methods.In the framework，the factors of subtle reservoirs and their combination are analysised.Subtle reservoirs′ development characteristics and distribution law are explored further in the non marine compressed shallow basin.Based on reservoir lateral changes and controlling factors，the subtle traps are divided into three categories including lithologic traps，stratigraphic traps and combination traps and eight sub-categories.By completely analyzing the trap types，reservoir characteristics and their development position，reservoir distribution characteristics are concluded as follows: vertically，lithologic traps are controlled by sequence interface，stratigraphic traps by systems tracts while combination traps by tectonic activity periods and lithology lateral sealing.On the plane，reservoir distribution is striped.At last，subtle reservoir favorable areas are predicted and evaluated then exploration practice are parsed there.

Key words: compressed shallow basin, sequence stratigraphy, subtle reservoir, exploration practice, Turpan sag