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物探与化探  2020, Vol. 44 Issue (6): 1352-1360    DOI: 10.11720/wtyht.2020.1593
  地质调查·资源勘查 本期目录 | 过刊浏览 | 高级检索 |
电阻率层析成像在沉积区隐伏断层探测中的应用
高武平1,2(), 闫成国2, 张文朋2, 王志胜2
1.中国地震局 地球物理研究所,北京 100081
2.天津市地震局,天津 300201
The application of high density electrical method to concealed fault detection in sedimentary plain
GAO Wu-Pin1,2(), YAN Cheng-Guo2, ZHANG Wen-Peng2, WANG Zhi-Sheng2
1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2. Tianjin Earthquake Administration,Tianjin 300201, China
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摘要 

电阻率层析成像是开展城市活动断层探测的方法之一。本文以天津蓟运河断裂探测为例,对电阻率层析成像在沉积区隐伏断裂探测中的应用进行了尝试。野外施工中采取了多项针对性措施,获得了较可靠的电阻率层析成像剖面;在详细分析测区钻孔资料的基础上进行剖面的地质解释,并与浅层人工地震结果进行了对比。探测结果显示,蓟运河断裂为一条第四系断裂并表现出一定的分段性,北段最浅上断点深达25 m,为一条晚更新世活动断层,南段为55 m左右,是一条中更新世中晚期断层。本次探测工作表明,利用电阻率层析成像在沉积区进行隐伏断层探测可以获得良好的效果。

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高武平
闫成国
张文朋
王志胜
关键词 电阻率层析成像沉积平原隐伏断裂蓟运河断裂城市地质勘探    
Abstract

Resistivity tomography is a part of the methods for conducting fault detection in urban areas. In this paper, the application of resistivity tomography to the detection of concealed faults in sedimentary areas was attempted with the fault detection of the Tianjin Canal as an example. The Wenner symmetrical quadrupole device (Wenner α) was employed to data acquisition. In order to obtain higher quality raw data, the authors adopted a number of targeted measures in the field construction. Data processing and inversion adopted a wide range of engineering circles. Using the RES2DINV software, the authors obtained a more reliable resistivity tomography profile. In the geological interpretation of the section, detailed analysis was carried out based on borehole data of the survey area in comparison with the results of shallow artificial earthquakes. The results show that the Jiyunhe fault is a Quaternary fault and shows a definite segmentation. The shallowest upper fault point in the northern section is about 25 m deep, which is a late Pleistocene active fault, and the southern section is about 55 m,which is a middle late Pleistocene fault. This probing work shows that the use of resistivity tomography for the detection of concealed faults in the sedimentary area can achieve good results, but in the process of geological interpretation, the sedimentary evolutionary environment, the geological structure of the basement, and the conductive ion density of the formation should be closely combined with each other. The impact is particularly dependent on other detection results to ensure the harmonization of relevant consequences.

Key wordsresistivity tomography    sedimentary plain    concealed faults    Jiyunhe fault    urban geological exploration
收稿日期: 2019-12-02      出版日期: 2020-12-29
ZTFLH:  P631  
基金资助:国家自然科学基金项目(41772123);天津市科技重大专项工程(18ZXAQSF00110)
作者简介: 高武平(1981-),男,中国地震局地球物理研究所固体地球物理学博士在读,高级工程师,主要研究方向为城市活动断层探测、城市地震灾害风险评估、地震动数值模拟。Email:gwpp123@126.com
引用本文:   
高武平, 闫成国, 张文朋, 王志胜. 电阻率层析成像在沉积区隐伏断层探测中的应用[J]. 物探与化探, 2020, 44(6): 1352-1360.
GAO Wu-Pin, YAN Cheng-Guo, ZHANG Wen-Peng, WANG Zhi-Sheng. The application of high density electrical method to concealed fault detection in sedimentary plain. Geophysical and Geochemical Exploration, 2020, 44(6): 1352-1360.
链接本文:  
http://www.wutanyuhuatan.com/CN/10.11720/wtyht.2020.1593      或      http://www.wutanyuhuatan.com/CN/Y2020/V44/I6/1352
Fig.1  研究区地震地质图与测线位置
Fig.2  测线JYH-1~JYH-3的反演电阻率剖面
Fig.3  测区典型钻孔钻孔柱状图与电阻率测井曲线
Fig.4  浅层人工地震17JYH-4测线时间剖面及电阻率层析成像剖面上断点投影位置
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