Detection Capability of Multi-Source Semi-Airborne Transient Electromagnetic method for Thin Layers
The multi-source semi-airborne transient electromagnetic method (TEM) is a research focus with many advantages such as great detective depth,strong adaptability in complex topography and high working efficiency. Based on the one-dimensional forward algorithm,this work selected the optimal location combination of survey point and electric sources. By means of defining response relative anamoly,we investigated the detection capability of multi-source semi-airborne TEM for thin layers with different resistivities,thicknesses and burial depths. The results show that stronger and simpler responses can be obtained with reasonable arrangement of survey point and electric sources. Compared with single source,signals stimulated by multi-source have higher strength and faster decay rate,which are more sensitive to earth resistivity variation. B is more suitable for analysis on detection capability of multi-source semi-airborne TEM for thin layers and the x component has the strongest detection capability. Bigger resistivity difference,thicker thickness and shallower burial depth will be favorable for increasing the relative anomaly amplitude and better distinguishing thin layers. Besides,thin layer detection capability is related to the location of survey point. Points inside the range of multi-source have stronger relative anomaly and are more suitable for detection.
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维普
