矿井三维瞬变电磁技术及其应用

3D Transient Electromagnetic Technology and Its Application in Coalmines

随着矿井深部煤炭的开采,井下水文地质条件越来越复杂,矿井瞬变电磁探测已成为有效解决该问题的一个重要手段。根据电磁感应一次场及二次场的感应原理,分析了瞬变电磁探测过程;并从晚期电阻率计算、异常干扰校正、基于Maxwell方程组推导的时深转换、三维距离加权反比插值运算、球坐标系的三维数据提取方面阐述了矿井三维瞬变电磁技术;运用该技术在山西焦煤集团东曲矿进行井下水仓的探测对比实验,结果表明:该技术不仅可以探测含水异常体位置,还对异常体形态有较好的反映。

Along with the coal extraction deepening, underground hydrogeological condition more and more complicated, the coalmine transient electromagnetic prospecting has become a major means to settle the issue. Based on the principle of electromagnetic induction, analyzed the primary field and secondary field induction processes, described transient electromagnetic prospecting process; expounded coalmine 3D transient electromagnetic technology from aspects of later stage resistivity computation, abnormal interference correction, time-depth conversion based on Maxwell equation system derivation, 3D inverse distance weighting interpolation, spherical coordinates 3D data extraction. Using the technology in underground sump detection contrast experiment in the Dongqu coalmine of the Shanxi Coking Coal Group Co. Ltd., the result has shown that the technology can not only detect the location of water-bearing anomalous bodies, but also reflect their pattern better.