基于大地电磁测深的平原区隐伏断裂构造研究——以天津蔡公庄乡等四幅区调为例  

Study on concealed fault structure in plain area based on magnetotelluric sounding——Taking Caigongzhuang Township and other four regional surveys in Tianjin as an example

作　　者：于建华 夏方华 张志强 于秀璇 刘玉 YU Jianhua;XIA Fanghua;ZHANG Zhiqiang;YU Xiuxuan;LIU Yu(Exploraion unit of North China Geological exploraion Bureau,Langfang 065201,Hebei,China)

机构地区：[1]河北华勘地质勘查有限公司,河北廊坊065201

出　　处：《矿产勘查》2023年第7期1161-1173,共13页Mineral Exploration

基　　金：天津市区域地质调查项目(国土房任[2014]20号)资助。

摘　　要：地球物理勘探在厚覆盖的平原区地质调查中可发挥其深穿透优势,尤以大地电磁测深效果最佳。本文通过开展大地电磁测深测量,获取了区内电性分布特征,并据此划分出研究区基底构造特征,重新厘定了沧县隆起、黄骅凹陷两个主要构造单元,圈定了天津东凸起、板桥凹陷、港西凸起、歧口凹陷等次级构造单元。为研究区内国土资源功能区划、地质环境保护及城乡规划提供了详实的基础地质资料。研究表明,大地电磁法相较于其他传统地球物理方法而言,具有勘探深度大、高效等优势,可为解决平原区深部构造、基底结构和断裂构造分布等关键地质问题提供技术支撑。Geophysical exploration can play its deep penetration advantage in the geological survey of thick covered plains,of which the method by the magnetotelluric(MT)sounding method could get optimum result.By carrying out MT in the research area,the electrical distribution characteristics are obtained,and the basement structure division of the study area is given.In this paper,the two main structural units of Cangxian uplift and Huanghua depression are redefined,and the secondary structural units such as Tianjin east convexity,Banqiao sag,Gangxi convex and Qikou sag are delineated.These results provide detailed basic geological data for the functional zoning of land resources,geological environmental protection and urban and rural planning in the study area.At the same time,it is shown that compared with other traditional geophysical methods,the MT sounding method has the advantages of large exploration depth and high efficiency,which can provide technical support for solving key geological issues such as deep structures,basement structure and fault structure distribution in plain area.

关 键 词：大地电磁法 区域地质调查 断裂构造 隐伏断层 平原区 

分 类 号：P631.3[天文地球—地质矿产勘探]