The feasibility of using the transient electromagnetic sounding (TS or TDEM) method for exploration can be studied by means of numerical models. The TS method is best suited for locating conductive targets, and has very good vertical resolution.
Unlike other sounding techniques where the receiver-transmitter array must be expanded to sound more deeply, the depth of investigation for the TS method is a function of the conductivity and length of time the transient is recorded. In this paper, a three-layer model, the second layer of which contains a hydrocarbon zone, is investigated. The results show the sensitivity of the method to the thickness of the layers. On the other hand, due to the speed of the equipment data-processing, the thickness of the first layer should be large enough to determine its apparent resistivity. Also, the interface of saline water It can be estimated with respect to the change in the first minimum of curve.