In order to understand the near-source TEM sounding method, the topic on the time domain electromagnetic?exploration of deep targets is addressed using a grounded dipole source. At first, the development of the near source?TEM is reviewed in this paper, then a new kind of technique capable of detecting geological targets located at deeper?levels in the subsurface is proposed using the short-offset transient electromagnetic method (hereafter referred to?as SOTEM). The detection abilities of this system, such as the feasibility of near-source detection for SOTEM, the?investigation depth of SOTEM and the sensitivity of SOTEM, have been analyzed. The conclusion has been achieved?that the proposed method is more applicable and convenient for exploration and could be used to obtain a greater?detection depth with higher detection accuracy.
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