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大多数电磁系统在频域工作,连续发射一个固定频率,最近发展的瞬变电磁法系统在时域工作,发射脉冲,并在脉冲间隔期间,记录产生的任何二次场瞬变衰减,因此,对电磁法勘探来说,瞬变电磁法(TEM)的优点大大地超过了固定频率系统.在澳大利亚的不同地区进行了瞬变电磁法试验性勘探,以对该方法进行评价.该试验性勘探是在澳大利亚北部领土的鲁姆丛林、马丽河和特南特河地区进行的.总的说来,瞬变电磁法的观测结果与其它电磁法的观测结果是一致的,并与地质观测结果有良好的相关性,在澳大利亚导电盖层条件下,该方法本身在理论方面的优点是值得注意的,而野外试验结果也证明了这些优点.可以断定,TEM装置可用于地形条件或高导电表层条件严格地限制了其它物探方法效果的那些地区.应用边长100～150米大的回线,使得能够进行大面积的快速勘探,同时,也证明了用小回线可以准确地圈定异常.应用不同尺寸的回线和回线交迭有助于定量解释.总之,电磁法在澳大利亚获得了不同程度的成功.通
Most electromagnetic systems operate in the frequency domain, emitting a fixed frequency continuously. Recent developments in the field of transient electromagnetic systems work in the time domain, transmitting pulses and recording any secondary field transient decay during the pulse interval. Thus, For electromagnetic surveys, the advantages of transient electromagnetic methods (TEMs) outweigh the advantages of fixed-frequency systems in that transient electromagnetic studies are conducted in different areas of Australia to evaluate the method, Is carried out in the Rum Jungle, the Marley River and the Tenente River in the territory of Northern Australia. Overall, the results of TEM are consistent with those of other electromagnetic methods and are consistent with the results of geological observations It is noteworthy that the method itself has theoretical advantages over conductive cap conditions in Australia, and the field test results demonstrate these advantages. It can be concluded that TEM devices can be used for topographical or highly conductive surface conditions Strictly limiting the effects of other geophysical methods, the use of large loops of 100-150 meters makes it possible to conduct large-area rapid exploration and also to prove Using small loops can accurately delineate anomalies. The use of different sizes of loop and loop overlap contributes to the quantitative interpretation. In summary, the electromagnetic method achieved varying degrees of success in Australia.