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二连盆地下白垩统充填在一系列NE—NNE向基底断层控制的地堑、半地堑断陷中,可以划分为5个坳陷和4个隆起。根据断陷及其主控断层的组合方式可以将复式断陷划分为串联式、并联式、斜列式和交织式等4个类别,每一类又可以分为同向半地堑复合、相向半地堑复合、地堑与半地堑复合和地堑与地堑复合等4种型式。复式断陷带(群)的分布主要受海西期基底软弱带控制,构成的5个坳陷的延伸方向各不相同。二连盆地下白垩统的含油气性与复式断陷结构、裂陷作用方式密切相关:正向裂陷作用形成以串联式、串联斜列式复合为主的复式断陷,有利于发育具有深洼槽的断陷湖盆,为烃源岩发育创造了条件;斜向裂陷作用形成的以斜列式、并联式复合为主的复式断陷,有利于发育具有宽缓斜坡、台地的断陷湖盆,发育斜坡相烃源岩;隆起上零星散布的断陷多是在刚性基底上发育的,边界断层陡倾且位移量大的断陷更利于形成发育烃源岩的深陷湖盆。
The Lower Cretaceous in the Erlian basin was filled in a series of graben and semi-graben fault controlled by NE-NNE basal faults, which can be divided into five depressions and four uplifts. According to the combination of fault depression and its controlling fault, the compound fault can be divided into four categories: tandem type, parallel type, inclinometer type and intertwined type. Each type can be divided into the same direction and half graben compound, Semi-graben compound, graben and semi-graben compound and graben and graben compound 4 kinds of patterns. The distribution of multi-fractured zones (groups) is mainly controlled by the Hercynian basement weakness zone, and the five depressions formed by them all have different extension directions. The Lower Cretaceous petroleum in the Erlian Basin is closely related to the complex rift-faulted structure and the mode of the rifting. The forward rifting forms a complex rift-dominated complex series of faults, which is favorable for the development of deep rifts with deep The depression faulted lacustrine basin has created the conditions for the source rock development. The oblique faulted and parallel compound complex-dominated complex rifts are favorable for the development of broad and gentle slopes. In the lacustrine basin, the source rock of slope facies is developed. The sporadic scattered sporadic on the uplift is mostly developed on a rigid basement. The fault with steep dip and large displacement of the boundary fault is more favorable for the formation of deep lacustrine basin .