| 东营凹陷中央背斜隆起带形成机制分析 |
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| 引用本文： | 任建业,张青林.东营凹陷中央背斜隆起带形成机制分析[J].大地构造与成矿学,2004,28(3):254-262. |
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| 作者姓名： | 任建业 张青林 |
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| 作者单位： | 中国地质大学资源学院,湖北,武汉,430074;中国地质大学资源学院,湖北,武汉,430074 |
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| 基金项目： | 国家自然科学基金《渤海湾盆地中始新世末期构造变革界面研究》(项目批准号 :40 3 72 0 67)的部分研究成果 |
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| 摘 要： | 重建了东营凹陷构造演化过程 ,提出在盆地古近纪同裂陷期充填序列中 ,沙三段底界面S6′界面具有构造变格意义 ,过该界面盆地的构造应力场发生了由近南北向拉伸到NW—SE向拉伸的转换。在此基础上重新解析了盆地中央背斜隆起带 ,并指出中央背斜带是一个复合的构造系统。其东段的辛镇背斜的性质为受控于陈南铲式断层的大型伸展断弯褶皱 ,主要的活动期为Ek—Es下3 时期 ;而其西段为东营—梁家楼—现河弧形生长滑脱断裂系统的组成部分 ,主要形成于Es上3 —Es2 沉积时期。上述认识对于中央背斜隆起带油气勘探具有重要的意义。
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| 关 键 词： | 东营凹陷 中央背斜隆起带 伸展断弯褶皱 弧形生长滑脱断裂系统 |
| 文章编号： | 1001-1552(2004)03-0254-09 |
| 修稿时间： | 2004年1月15日 |
ANALYSIS OF DEVELOPMENT MECHANISM FOR CENTER ANTICLINE HIGH IN DONGYING DEPRESSION |
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| REN Jianye and ZHANG Qinglin.ANALYSIS OF DEVELOPMENT MECHANISM FOR CENTER ANTICLINE HIGH IN DONGYING DEPRESSION[J].Geotectonica et Metallogenia,2004,28(3):254-262. |
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| Authors: | REN Jianye and ZHANG Qinglin |
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| Abstract: | A regional unconformity-S′_6 is distinguished in the Tertiary filling sequence of Dongying depression by interpretation of 3D seismic profiles. This sequence boundary lies on the bottom of the 3~(rd) Member of Shahejie Formation and can be traced and contrasted in the whole basin area. Analysis on stratigraphic thickness and tectonic stress field of the basin reveals that S′_6 boundary divided the Tertiary synrifting stage into two episodes controlled by different tectonic stress fields, i.e., the first episode of basin development and the second episode of basin development. The former was controlled by N-S trending extensional tectonic stress field, forming half grabens bounded by Chennan fault and Shicun fault; while the latter was controlled by NW-SE trending extensional tectonic stress field, forming half graben bounded by NE trending fault system. S′_6 boundary is a regional unconformity and can be found and traced in Bohai gulf basin and many other basins in East China. The boundary occurred in late Middle Eocene, which was consistent with the time of a great reorganization of global plate tectonics during Cenozoic. Based on research on tectonic revolution of this basin, center anticline high in it has been analyzed. Center anticline high is a composite tectonic system. Its east segment, Xinzhen anticline is an extensional fault bend fold controlled by Chennan listric fault, which developed during the depositional period of Kongdian Formation and the 4~(th) Member of Shahejie Formation; while its west segment is a part of Dongying-Liangjialou-Xianhe arc shaped syndepostional fractural system, which formed during depositional period of Es~上_3-Es_2. The above conclusions have an important significance for exploration in center anticline high in Dongying Depression. |
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| Keywords: | Dongying Depression center anticline high extensional fault bend fold arc shaped syndepositional fractural system |
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