Abstract
A new S-inversion approximate interpretation approach was developed to reflect electric interface underground from multi-source semi-airborne Transient electromagnetic method (TEM) data. This method starts with electrical source TEM S-inversion according to the second derivative of the conductivity parameter based on the moving thin sheet approach, and then the superposition principle was adopted, which could effectively avoid the random noise, introduced by the differential and highlight the abnormal information in the depth. In this article, the method of second derivative of apparent longitudinal conductivity, which is designed for semi-airborne TEM interpretation, the theoretical analyses and the numerical method are also studied in detail. Finally, a real semi-airborne data is studied with the approach, and result shows that the proposed method is effective and successful for exploring unfavorable geology for semi-airborne TEM.
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