2D seismic and high-density resistivity sounding reveal the shallow three-dimensional geological structure characteristics of Xiong'an New Area
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摘要: 雄安新区位于冀中平原中部,地下结构具有新生界地层厚度大、成层性好、构造活动相对稳定的显著特点。为精细刻画浅层地质结构,查明断裂构造特征,提高浅部探测精度,本次研究采用二维地震和高密度电阻率测深结合的方法,取得了重要进展,主要包括:①精细刻画了工作区200 m以浅深度范围内地层结构和断裂构造空间展布特征;②构建了三维可视化地质结构模型,直观展示了调查区新生界地层起伏形态和主要断裂构造空间分布;③分析总结了城镇化高干扰背景环境下地球物理方法的探测深度、横纵向分辨率、目标体响应特征和适用性等。本次研究有效支撑和服务了雄安新区的规划、建设以及地下空间开发利用,对大厚度沉积盆地城市地下空间的地球物理探测具有借鉴意义。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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