Distortions of EM transients in coincident loops at short time-delays

Authors: Kamenetsky F.; Oelsner C.

Source: Geophysical Prospecting, Volume 48, Number 6, November 2000 , pp. 983-993(11)

Publisher: Blackwell Publishing

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Abstract:

Transient electromagnetic measurements with short time-delays of transients are used for solving different problems within the upper part of a geoelectric section. However, it is necessary to take into consideration distortions connected with self-transients within the transmitter–receiver system. From the practical point of view, it is important to estimate the minimum time-delay after which these distortions may be neglected. We present such an estimation which uses a simple approximation method for a single-loop (or coincident-loop) configuration. For common values of the loop size (10 m × 10 m to 40 m × 40 m) and of the resistivity of a homogeneous half-space (1–100 OHgr m), the minimum time-delay beyond which we can use a standard interpretation is in the range of 2–10 µs. This is equivalent to a minimum depth of investigation in the range of 1–30 m.