综合地球物理在雄安新区三维地质结构探测中的应用与成果

Application and achievements of comprehensive geophysics prospecting in three-dimensional geological structure exploration in Xiong’an new area

雄安新区位于华北平原,上覆巨厚的新生代松散地层,深部地质结构复杂,按照国家高起点高标准开发建设雄安新区的要求,亟需开展综合地球物理调查以查清深部三维地质结构。本次工作通过优选实用有效、深浅兼顾的方法技术组合,部署点线面结合的测网,采用重震电联合解释方法,精细刻画了雄安新区三维地质结构,系统厘定新区断裂构造展布与基岩界面起伏形态,揭示了区域壳幔结构特征,推断壳内热源、划分地热储层、圈定有利含水层,为构建世界一流“透明雄安”提供了技术支撑。

Xiong’an new area is located in the north China plain,covered by the huge thick cenozoic loose strata and deep geological structural complexity.According to the demand of high standard development and construction of Xiong’an new area,it is urgent to find out the deep three-dimensional geological structure.In this work,an effective combination of comprehensive geophysical methods has been optimized according to the principle of considering both deep and shallow exploration.The survey network is deployed in the way of combining point,line and plane.Through the joint exploration and interpretation of gravity,earthquake and electricity,a three-dimensional geological structure of Xiong’an new area is described in detail.This work systematically determined the distribution of fault structure and the undulating shape of bedrock interface in the new area,which revealed the structural characteristics of the regional crust and mantle,inferred the heat source in the crust,divided the geothermal reservoir and delineated the favorable aquifer.It provides technical support for building a world-class"transparent Xiong’an".