大地电磁测深法在矿山地质构造探测中的应用

Application of magnetotelluric sounding method in mine geological structure exploration

了解矿区内矿体的赋存厚度、深度及断裂发育程度。介绍了大地电磁测深法基本原理,利用大地电磁数据系统所采集的野外电磁场,数据进行分析和处理。本次大地电磁勘查,推断解释断层4条,均为正断层。新生界反演电阻率值一般为50Ω·m～400Ω·m左右;太古界单塔子群和中生界侏罗系上统张家口组反演电阻率值一般为1000Ω·m～3000Ω·m;燕山期矿体反演电阻率值较大,大于3000Ω·m。该方法对探测矿山断层、岩体分界类地质构造具有良好的效果,更具有推广的价值。

To understand the occurrence thickness, depth and fracture development of the thermogenic ore bodies in the area. This paper introduces the basic principle of magnetotelluric sounding method, and analyzes and processes the field electromagnetic field collected by magnetotelluric data system. In this magnetotelluric survey, four faults were inferred to be normal faults. Cenozoic inversion of resistivity value generally about 50Ω·m ~ 400Ω·m;Archaean group on single pylon subgroup and Mesozoic Jurassic series zhangjiakou group inversion of resistivity value generally is 1000Ω·m ~ 3000Ω·m;Yanshan students hot orebody inversion of resistivity value is bigger, more than 3000Ω·m. This method has a good effect on detecting the geological structure of mine fault and rock mass boundary.