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摘要
The detection of thin layers has always been paid a lot of attention in geophysical prospecting, but previous researches mainly focus on the detection results of different geophysical methods while ignoring the influence of the observation parameters. The grounded-wire transient electromagnetic method (TEM) was chosen to the thin layer detection, and the relationship between offset, observation time and detection capability was analyzed based on the ID forward modeling and the defined relative anomaly, which was used to reflect the detection capability of the TEM for thin layers. Hence, the way on how to choose proper observation parameters for fast and fine detection of thin layers was given. The results show that detection capability of transient electromagnetic method for thin layers becomes decreased linearly and then gradually tends to be stable with the increase of the offset, at the same time, the demanded observation time becomes longer, which is bad for actual field measurement. Besides, the decrease speed of detection capability becomes slower with the increasing of resistivity or buried depth. Therefore, it is concluded that adopting short offset in data collecting not only can improve the detection accuracy, but also can improve the detection efficiency.
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