三维高密度电法在隐伏断层探测中的应用

Application of 3D Electrical Resistivity Tomography to Buried Fault Detection

运用三维高密度电法对豫北某拟建水库坝址区进行探测,获取了海量三维高密度电法数据,经过反演和三维可视化模拟,直观反映了坝址区地质结构,发现1条隐伏陡倾断层。在低阻异常区开展钻探和钻孔电视,验证了电法的研判结果。在三维高密度电法基础上,布设多条二维高密度电法测线,验证了三维探测结果,确定了断层产状,为坝轴线选取提供了参考,表明三维高密度电法探测灰岩区隐伏断层效果良好。

Using the 3D Electrical Resistivity Tomography to detect the dam site area of a proposed reservoir in northern Henan,the massive 3D Electrical Resistivity Tomography data was obtained.After inversion and 3D visualization,the geological structure of the dam site area was visually reflected and a buried steep fault had been discovered.Drilling and drilling TV were carried out in the low resistance anomaly area,and the results of the 3D Electrical Resistivity Tomography for the low resistance anomaly area were verified.On the basis of 3D Electrical Resistivity Tomography,a number of 2D Electrical Resistivity Tomography lines were laid,at the same time the detection results of 3D Elec trical Resistivity Tomography was verified,the occurrence of fault was determined,and the reference basis for the dam axis selection was pro vided.It shows that the 3D Electrical Resistivity Tomography has good effects in detecting the buried faults in the limestone area.