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| 2D seismic and high-density resistivity sounding reveal the shallow three-dimensional geological structure characteristics of Xiong'an New Area |
LONG Hui( ), XIE Xing-Long, LI Feng-Zhe(), REN Zheng-Wei, WANG Chun-Hui, GUO Shu-Jun |
| Center for Hydrogeology and Environmental Geology Survey,China Geology Survey,Baoding 071051,China |
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Abstract The Xiong'an New Area is located in the middle part of the Jizhong Plain.The Cenozoic strata in the underground structure of the area have a large thickness,good stratification,and relatively stable tectonic activities.To finely determine the shallow geological structures,ascertain the fault structure characteristics,and improve the shallow exploration accuracy,this study combined two-dimensional seismic surveys and high-density resistivity sounding and made the following important progress.①This study finely determined the geological structure and the spatial distribution characteristics of fault structures at a depth of less than 200 m in the Xiong'an New Area;②This study constructed a three-dimensional visualized geological structure model,which intuitively displays the stratigraphic fluctuation pattern of Cenozoic strata and the spatial distribution of main fault structures;③This study analyzed and summarized the application of geophysical methods under the background of urbanization-induced high disturbance,including their exploration depths,horizontal and vertical resolution,response characteristics of geological bodies,and applicability.This study effectively supports and serves the planning,construction,and underground-space development and utilization in the Xiong'an New Area and serves as a reference for the geophysical exploration of urban underground space in hugely thick sedimentary basins.
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Received: 11 June 2021
Published: 17 August 2022
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Corresponding Authors:
LI Feng-Zhe
E-mail: longlong19870402@163.com;li_fz@163.com
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The seismic time profile of R2-1 in the study area
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Distribution map of main stratigraphic sequences in the study area
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Distribution map of fault structure in the study area
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Inversion profile of high-density resistivity sounding of Xiongan New Area
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Graph of groundwater salinity and apparent resistivity
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The 0~200 m 3D visual geological model of the study area
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Buried depth map of the Quaternary bottom in the study area
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| 物探方法 | 探测深度 | 探测精度 | 解决地质问题 | | 二维地震 | 30~2500 m | 横向分辨率:取决于道间距,1、2.5、5 m。
纵向分辨率:深度不同垂向分辨率不同:
①30~200 m:分辨率3~5 m,可识别测井视电阻率大于35 Ω·m的厚度不小于4 m的中细—中粗砂层;
②200~600 m:分辨率5~10 m;
③600~2 500 m,分辨率10~30 m。 | ①划分砂层和粉质黏土层,刻画地层结构,识别“隆—凹”格局;
②查明断裂构造分布规律及空间展布特征;
③确定2500 m以浅地热储层埋藏深度、厚度和其他地质信息;
④为工程地质孔连孔提供空间层位信息和约束。 | | 高密度电阻率测深 | 0~150 m | 横向分辨率取决于点距,一般认为是点距的二分之一:2.5、5 m。
纵向分辨率:深度不同垂向分辨率不同:
①0~50 m:分辨率5~8 m;
②50~120 m:分辨率8~15 m;
③120~150 m:分辨率15~22 m。 | ①识别浅部地层岩性,建立岩—电关系结构,刻画地层特征;
②了解地下水分布特征;
③为工程钻孔间地层连接和古河道砂体分布提供依据。 |
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Applicability analysis of geophysical methods in Xiong'an New Area
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