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Russian Geology and Geophysics

2012 year, number 11

TESTING TEM SYSTEMS USING A LARGE HORIZONTAL LOOP CONDUCTOR

N.O. Kozhevnikov
A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
Keywords: TEM surveys, ungrounded horizontal loop, physical model
Pages: 1243-1251

Abstract

Testing TEM systems has to include field experiments with physical models commensurate to the real transmitter-receiver configurations and to the target subsurface features. A large horizontal loop closed across a known resistance is a convenient model in this respect. It is convenient to lay in the field, it has manageable parameters, and its natural response is easy to calculate.
A field-size experiment and numerical modeling were applied to investigate the model wire loop response to eddy current in a uniform conductive ground, both at early and late times. The higher the resistivity of the ground, the larger the time range in which the measured response matches the predicted one, other things being equal.
The experiments show that (i) closed loops laid near a transmitter-receiver system are applicable to test the quality of the latter as a tool for TEM or other similar resistivity surveys; (ii) current induced in the model loop can be used to infer the resistivity of the ground; (iii) a closed loop slows down the growth and reduces the amplitude of voltage induced at early times in a receiver loop or in a multiturn coil.