| 地球物理资料揭示的嫩江—八里罕断裂中段深浅构造特征 |
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| 引用本文： | 张鹏辉,张小博,方慧,王小江,刘建勋.地球物理资料揭示的嫩江—八里罕断裂中段深浅构造特征[J].吉林大学学报(地球科学版),2020,50(1):261-272. |
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| 作者姓名： | 张鹏辉 张小博 方慧 王小江 刘建勋 |
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| 作者单位： | 1. 国家现代地质勘查技术研究中心, 河北 廊坊 065000;2. 中国地质科学院地球物理地球化学勘查研究所, 河北 廊坊 065000 |
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| 基金项目： | 中国地质调查局地质调查项目（DD20160164，DD20190030）；中央级公益性科研院所基本科研业务费专项（AS2019Y02） |
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| 摘 要： | 嫩江-八里罕断裂是松辽盆地西缘的一条重要断裂，对区域中-新生代盆地的形成演化至关重要。由于该断裂中段地表覆盖厚层第四系，其深部构造特征研究程度较弱。本文通过对横跨嫩江-八里罕断裂的1条大地电磁测深测线和1条地震测线进行处理和解译，结合区域钻井结果解译了该断裂深部、浅部构造特征。结果表明，深部电性结构横向上以"八"字型低阻条带为界与地质单元具有较好的对应关系；结合已有地质认识推断东倾的L3低阻条带是嫩江-八里罕断裂的电性响应。该断裂是1条东倾的超壳断裂，浅部产状较陡、向深部逐渐趋缓，整体上由2条东倾的反"Y"字型断裂和1条西倾的断裂组成，呈花状构造样式，指示断裂曾历经强烈的挤压应力环境。
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| 关 键 词： | 嫩江—八里罕断裂 大地电磁测深 壳内低阻层 构造特征 松辽盆地 |
| 收稿时间： | 2019-01-23 |
Deep and Shallow Structural Characteristics of Middle Segment of Nenjiang-Balihan Fault Based on Geophysical Data |
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| Zhang Penghui,Zhang Xiaobo,Fang Hui,Wang Xiaojiang,Liu Jianxun.Deep and Shallow Structural Characteristics of Middle Segment of Nenjiang-Balihan Fault Based on Geophysical Data[J].Journal of Jilin Unviersity:Earth Science Edition,2020,50(1):261-272. |
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| Authors: | Zhang Penghui Zhang Xiaobo Fang Hui Wang Xiaojiang Liu Jianxun |
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| Institution: | 1. National Center for Geological Exploration Technology, Langfang 065000, Hebei, China;2. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, Hebei, China |
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| Abstract: | The Nenjiang-Balihan fault is an important fault on the western margin of Songliao basin. It is of great significance to study the formation and evolution of the Meso and Cenozoic basins in the region. The previous research on the deep structural characteristics of the Nenjiang-Balihan fault is relatively inadequate, as it is covered by thick sediments. In this study, one MT (magnetotelluric sounding) line and one seismic profile across the Nenjiang-Balihan fault were processed and interpreted, and in combination with the regional drilling data, the structural characteristics of the deep and shallow parts of the fault were obtained. The results show that the deep electrical structures along the MT profile are horizontally bounded by an "eight-shaped" low resistance band and corresponded well to the geological units. It is inferred that the east-dipping low-resistivity strip L3 represents the Nenjiang-Balihan fault with the characteristics of concealment, ultra-crust, shallow high angle, etc. The whole fault is composed of two east-dipping anti-Y-type faults and one west-dipping fault, in a flower-like structural style, indicating that the faults have experienced a strong compressive stress environment. |
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| Keywords: | Nenjiang-Balihan fault magnetotelluric sounding low-resistivity layer in crust structural characteristics Songliao basin |
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