中心回线TEM勘探中的野外试验要点

摘要

Advanced field experiment in electromagnetic exploration is of importance for performing geological projects and evaluating data interpretation.First,the measuring time is computed by geoelectric parameters,then the transmitting loop side and current could be determined according to the noise electric level.After the test of wave form,the measuring time will be confirmed through the geo-logical effect experiment beside drill holes.Nevertheless,the signal-to-noise ratio,the coincidence and the stability should meet the re-quirements of prospecting accuracy.%电磁勘探施工前的野外试验，对完成地质任务、评估解释结果具有重要意义。使用V8多功能电法测量系统，以王家岭煤田水文地质勘探为例，首先利用地层电性参数，给出了达到预定勘探深度需要的观测时间估算方法；再根据测区噪声电平，决定发射回线边长和电流；波形检测后，经孔旁地质效果试验确认观测时间。信噪比，一致性、稳定性经过试验符合探测精度的要求。