地面瞬变电磁资料解释精度的进一步提高一直是该方法研究的重点内容。以瞬变电磁烟圈效应扩散理论为依据，通过双倍旅程和平均速度概念建立了时深转换方法，以克服瞬变电磁采用简单经验公式计算实测数据时可能出现的深度翻转问题;以三维地震成果数据获取的9号煤层深度作为电性标志层校正标准，采用视电阻率微分极值点识别该电性标志层，通过比值法计算相应瞬变电磁测点的深度校正系数K值，然后采用内插方法得到测区任意点K值，以校正瞬变电磁在计算探测深度时出现的偏差。通过堡子矿钻孔ZKB1-1和ZK201电阻率测井资料分别建立了正演理论模型，计算了瞬变电磁响应，并和钻孔旁瞬变电磁实测数据的视电阻率微分极值对比，结果表明，两者基本一致，能够准确识别电性分界面。以矿区256线和344测线为例说明了电性标志层识别效果，计算了堡子矿全区深度校正系数，对该区资料进行了精细处理，圈定了工作区奥灰顶低阻异常区，以视电阻率为基本参数，分析评价了该区的地层赋水性强弱。根据奥灰顶视电阻率平面图以及地表径流，结合断层构造的分布特征，确定了导水通道存在及位置。最后通过钻孔验证表明:该方法处理探测深度精度误差小于5%，达到了对地面瞬变电磁资料的精细解释。

A further improvement of the interpretation accuracy of transient electromagnetic data on the ground has been the focus of this method. A time-depth conversion method is established by using the concepts of double journey time and average velocity based on the diffusion theory of transient electromagnetic smoke ring effect in order to over- come the problem of depth reversal which may occur when transient electromagnetic exploration depth is calculated by simple empirical formula. With the depth of No. 9 coal seam obtained from three-dimensional seismic data as the cor- rection standard of electrical marker layer,the apparent resistivity differential extremum points are used to accurately identify electrical marker layer,and the depth correction coefficient K of corresponding transient electromagnetic meas- uring points is calculated by ratio method. Then the K value of any point in the measuring area is obtained by interpo- lation method,which provides a basis for the accurate processing of data. Based on the resistivity log data from bore- hole ZKB1-1 and ZK201 of Baozi Mine,the forward theoretical model is established,and the transient electromagnetic response is calculated. The results show that they are basically consistent and can accurately identify the electrical in-terface. Taking 256-line and 344-line as examples, the identification effect of the electrical marker layer was ex-plained,the depth correction coefficient of the whole Baozi Mine area was calculated,the data in the area was fine pro-cessed,and the area of low resistance anomaly at the Ordovician limestone tops of the working area was determined. According to the surface runoff and the apparent resistivity in whole area,the existence and location of the water diver-sion channel were determined. The resistivity was regarded as the basic parameter,the stratigraphic hydrogenicity water in the area were analyzed and evaluated. Finally,the drilling verification shows that the accuracy error of this method is less than 5% ,which achieves the fine interpretation of ground TEM data.