瞬变电磁三维成像技术在地质预报中的应用

The application of the TEM 3D imaging technique in geological forecasts

传统的瞬变电磁隧道超前地质预报解释成果图一般为视电阻率断面二维等值线图,但三维成像相比于二维成像要显得更加直观,信息量更加丰富,解释更加全面,可以提高瞬变电磁超前地质预报解释精度.因此,拟采用三维曲面延拓方法对瞬变电磁三维成像技术及其在隧道超前地质预报中的应用情况做一些探讨性研究.首先,从原理上阐述了三维曲面延拓成像方法,然后通过实例分析三维延拓成像的超前地质预报中的技术特点及其应用效果分析.最后,总结出相应的结论和规律,以此来指导瞬变电磁在隧道内的超前地质预报工作,不断提高瞬变电磁探测的精度及准确度.

The 2D section of apparent resistivity contour lines are usually used in the interpretation result of transient electromagnetic（TEM）.However,the 3D image is straighter,and has more abundant information and comprehensive interpretation compared to the 2D image,which can improve the interpretation accuracy of the TEM geological forecast.The 3D curved surface continuation method was adopted to discuss the TEM 3D imaging technique and its application in tunnel geological forecasts.First,the 3D curved surface continuation imaging method principle was introduced.Second,the 3D curved surface continuation imaging technique characters and its application effect analysis was discussed.Finally,some conclusions and laws were summed up in order to guide the transient electromagnetic method in tunnel geological forecasts in order to improve the accuracy of the TEM detection.