Abstract：In the drilling process, the leakage of drilling fluid will occur when the drilling bit encounter karst strata.This kind of well leakage causes drilling interruptions or even serious accidents.Therefore, before drilling, complete karst strata information should be collected based on geological prediction.Based on the geological prediction of the exploration area, we use the transient electromagnetic (TEM) method and the symmetrical four-pole sounding method to detect near-surface karst (up to 300 meters depth), and interpret inversion results with the constraint of geological information to determine near-surface karst strata and ensure well drilling.Our application proves that the proposed approach can effectively detect near-surface karst strata.
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