【摘要】 板桥凹陷是大港油田的主要油气勘探和开发区之一。对板桥凹陷古近系层序构成样式和沉积充填的综合研究表明,在盆地幕式断陷活动和同沉积断裂差异断陷活动等构造作用下,形成了断坡带、构造调节带和断阶带3种构造坡折样式,它们制约了沉积物的分散过程和砂体堆积,对板桥凹陷层序样式和沉积体系形成分布起到重要的控制作用,构成了不同的层序构成和沉积充填模式。其中,构造调节带和断阶带控制了研究区主要砂体的展布,特别是低位三角洲或盆底扇砂体的发育和分布,有利于形成砂岩透镜体、岩性上倾尖灭、地层超覆及构造—岩性圈闭等多种圈闭类型,是寻找砂岩油气藏的有利区带。更多还原

【Abstract】 The Banqiao Sag is one of the most important oil-gas bearing areas in the Dagang oilfield. Comprehensive analyses on the Paleogene sequence compositional types and sedimentary filling patterns showed that affected by episodic rifting of the basin and differential subsidence of contemporaneous faults,three different structural slope-break types,including fault ramp zone,structurally regulated zone and fault-terrace zone,were formed and they controlled sediment distributions and sand-body accumulations,playing a significant controlling role in the formation and distribution of sequence types and depositional systems,and forming different sequence compositions and depositional filling patterns. Of which the structurally regulated zone and fault-terrace zone controlled the distribution of main sand-bodies in the studied area,especially the development and distribution of low-stand deltas and basinal floor-fan sand-bodies,they favored to form different kinds of traps,such as sandstone lens,lithologic updip pinching-out traps,stratigraphic overlap traps and structural-lithologic complex traps,all of these are favorite locations to prospect sandstone reservoirs in the Banqiao Sag.更多还原