歧口凹陷裂后期断裂与晚期油气运聚成藏探讨

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以歧口凹陷内所发现的新近系油气藏为研究对象,在对比相邻区域新近系油气藏研究的基础上,阐述了新近系一第四系裂后期断裂平面和剖面形态、断裂活动强度规律以及晚期断裂活动等对新近系晚期油气运移、聚集和成藏的影响和控制作用,结果表明,歧口凹陷裂后期断裂系统十分发育,裂后期断裂活动控制着歧口凹陷的油气运移、聚集和成藏。断裂的转折部位、多条断裂的汇聚区域以及两条走向相近但倾向相反断裂的交接部位是油气主要聚集区:同向或反向“Y”形断裂是油气有利运移通道,对新近系晚期成藏十分有利,断裂活动强度对新近系晚期成藏有着控制作用,
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