瞬变电磁法在地质勘探中的应用

Application of Transient Electromagnetic Method in Geological Exploration

在地下水勘查工作中,用常规物探方法难以划分地层的结构、确定断裂构造的位置、查明基岩面的起伏形态及判断地下水的赋存状况。通过瞬变电磁法(TEM)勘测并结合钻孔资料分析,对上述地质问题有了一些突破性的认识,证明了瞬变电磁法在勘查工作中的有效性。当地下存在电性不均匀体时,通过瞬变电磁法会观测到电性不均匀体的涡流异常场,进而推断矿体、地下水、地质构造等地下盲体的存在和部位。依据此特征成功地将瞬变电法在探测中进行了应用。

Abstract： The common geophysical methods for groundwater exploration seam to be ineffective in classifying the structures of strata, locating the positions of faults, finding out the shape of bedrock surface and estimating the distribution of groundwater. Using TEM exploration combined with an analysis of borehole data, made some breakthrough in solving the above - mentioned hydrogeological problems. The results prove the effectiveness of this method in ground water exploration. When underground objects have uneven electrical characteristics, their eddy currents may be measured by the transient electromagnetic method, and the underground object such as ore body, water body and gob can be found out. This method has achieved successful application in gob exploration.