OALib Journal期刊
ISSN: 2333-9721
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二连盆地早白垩世复式断陷构造类型及其石油地质意义
Keywords: 复式断陷,构造样式,富油凹陷,下白垩统,二连盆地
Abstract:
?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。
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