| 辽东湾坳陷东部新生代构造发育与成因机制 |
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| 引用本文： | 李伟,任健,刘一鸣,李春锐.辽东湾坳陷东部新生代构造发育与成因机制[J].地质科技通报,2015,34(6):58-64. |
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| 作者姓名： | 李伟 任健 刘一鸣 李春锐 |
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| 作者单位： | 1. 中国石油大学(华东)地球科学与技术学院, 山东 青岛 266580; |
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| 基金项目： | 国家科技重大专项课题(2011ZX05023-006-05)中央高校基本科研业务费专项资金项目(27R1101053A)中央高校基本科研业务费专项资金项目(14CX06079A) |
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| 摘 要： | 以三维地震资料为基础,刻画了辽东湾坳陷东部地区新生代断裂体系平面和剖面发育特征,对以断裂特征为主的构造样式进行了分析,并结合区域动力背景探讨了构造的发育演化与成因机制。结果表明:辽东湾凹陷东部古新世-渐新世的构造主要由NNE向的拉张正断层组成;渐新世时期以走滑构造样式为主,主干断裂附近出现走滑效应产生的增压区和释压区,同时发育似花状构造和多级“Y”字型构造样式,次级断裂多表现为NEE向的雁列状构造样式;新近纪时期断裂体系仍以雁列状断裂为主,发育共轭状剪切破裂以及“背形负花状”构造样式。构造特征体现了研究区新生代走滑构造系统与伸展构造系统的叠加改造过程,可以将辽东湾坳陷东部地区的构造演化阶段划分为古新世-始新世的弱走滑强拉张时期、渐新世的弱拉张强走滑时期以及新近纪的弱挤压弱走滑时期。
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| 关 键 词： | 断裂体系 构造样式 发育演化 成因机制 新生代 辽东湾坳陷 |
| 收稿时间： | 2015-03-16 |
Development and Formation Mechanism of Cenozoic Tectonics in the East Area of Liaodong Bay Depression |
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| Affiliation: | 1. School of Geosciences, China University of Petroleum, Qingdao Shandong 266580, China;2. Tianjin Technical Department, CNOOC China Ltd. Bohai Oil Institute, Tianjin 300452, China |
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| Abstract: | Based on three dimensional seismic reflection data,this paper described the plane and section characteristics of Cenozoic fault system in the eastern area of Liaodong Bay Depression and analysed the structure styles reflected from the fault system.The paper discussed the evolution and development mechanism of tectonics combined with regional geodynamic setting.The results indicate that the structures in Paleocene and Eocene mainly consist of the extensional NNE trending faults and the structure styles in Oligocene have obvious strike-slip effect.The vicinity of main faults has significant stress-increasing area and stress-decreasing area resulted from strike-slip,and the flower-liking structure and " Y"-type structure style can be observed in the seismic profiles.The secondary faults are presented as NEE trending en-echelon structure style.In Neogene,the fault system is still manifested as en-echelon faults,while conjugate shear fracture and antiform-negative flower structure style appear in this period.The development and evolution of the structure reflects the superimposition and transformation between extension tectonic system and strike-slip tectonic system in Cenozoic.The evolutionary stages of the eastern Liaodong Bay Depression can be divided into the weak strike-slip-strong extension period(Paleocene-Eocene),the weak extension-strong strike-slip period(Oligocene)and the weak compression-weak strike-slip period(Neogene). |
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