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地球学报  2011 

天津北大港构造带东翼断裂活动浅析

DOI: 10.3975/cagsb.2011.03.13

Keywords: 北大港构造带东翼,断裂活动,构造样式,形成机制

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Abstract:

构造因素对油气的分布起着控制性的作用,断裂活动特征决定着一个盆地或凹陷油气的富集与分布。本文通过对北大港构造带东翼所有断裂的仔细研究,统计分析了区内20条规模较大断裂的断距在纵横向上的变化,结合20余条地震剖面和8条构造发育史剖面,综合分析认为北大港构造带东翼的断裂活动主要为:古近纪活动期和新构造期(0.78Ma至今)活动期。而在新近纪,研究区内断裂(或构造)活动极其微弱,多数断裂没有活动。从演化过程、空间分布等方面认为:港东-唐家河构造带,晚期构造活动对先存构造的破坏性较弱,与白水头构造带的断裂活动具有一定的相似性,形成了典型的花状构造;而白东构造带在新构造期断裂活动强烈,有些新生断裂切割到了古近系地层,有的断裂已达地表附近,形成了“对倾式”的断裂组合。并初步讨论了断层活动对油气运聚的影响。

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