【摘要】 北大港凸起构造带是歧口凹陷中央隆起带的重要组成部分,也是分析歧口凹陷新生代构造演化的关键地区之一,研究其形成演化对盆地构造演化研究和油气勘探均较重要。文中结合研究区最新三维地震数据,对北大港凸起构造带不同段的结构特征进行了精细描述,统计对比了构造带内主要断裂在新生代各期活动量,并运用平衡剖面技术对北大港凸起构造带的形成演化进行恢复。研究认为北大港凸起构造带沿走向在不同段存在不同的结构特征,纵向上则显示"一高一陡坡"的结构特征;构造带内的断裂活动主要集中在沙三期、沙一期、东营期和新近纪,刘岗庄断裂和大张坨断裂与滨海断裂和港东断裂两两互为侧向相接关系,其活动强度总体呈现出由西南向东北迁移的特征;在古近纪期间北大港凸起构造带主要经历了3期构造活动:沙三期末西南段局部抬升、沙一期缓慢抬升、东营期末的强烈隆升活动,且构造活动强度随时间发展有由西南向东北迁移的特点。北大港凸起构造带的形成演化为歧口凹陷的油气藏的形成提供了有利条件。更多还原

【Abstract】 Beidagang salient tectonic belt is the important part of central uplift belt of Qikou Sag,which is also one of the key areas to the research of the Cenozoic structure evolution of Qikou Sag.Research on the formation and evolution of the salient are particularly important for both basin structure evolution research and petroleum exploration.The paper subtly descripts the structure characteristics of different segments in Beidagang salient tectonic belt with the latest three-dimensional seismic data,statistically compares the fault activity of the tectonic belt’s main faults in each period of the Cenozoic and restores the Cenozoic structure evolution of Beidagang salient tectonic belt by using balanced section technology.It is considered that Beidagang salient tectonic belt shows different structure characteristics in different segments and shows the characteristic of"one culmination and one steep slope"in NE direction;fault activities mainly occurred in Sha-3period,Sha-1period,Dongying period and Neogene;the Liugangzhuang fault and Dazhangtuo fault are lateral connected,so do the Binhai fault and Gangdong fault;the strength of fault activity shows the migration from SW to NE.In the Paleogene the salient underwent three major tectonic uplift events:SW segment partial uplift activity in late Sha-3period,slowly uplifting in Sha-1period and intensive uplifting in late Dongying period;and the structure activity strength migrated from SW to NE with time.The evolution of Beidagang salient tectonic belt provides favorable conditions for hydrocarbon accumulation in Qikou Sag.更多还原