
%0 Journal Article
%A Raiche, A.P. 
%A Bennett, L.A. 
%T Layered earth models using downhole electromagnetic receivers
%J Exploration Geophysics
%D 1987/09/01
%V 18
%N 3
%P 325-329
%K 
%R https://doi.org/10.1071/EG987325
%U https://www.publish.csiro.au/paper/EG987325 
%X The transient electromagnetic (TEM) responses of several layered earth models are examined for the configuration consisting of a vertical downhole receiver and a large fixed loop source, on or above the earth's surface. It is shown that a conductive overburden will cause the magnetic field at depth to be greatly attenuated at early times, but considerably enhanced at late times. The use of a downhole receiver will improve the resolution of conductive units, but adds nothing to the already low probability of detecting resistive units using TEM methods. Compared with surface receivers, a downhole receiver will have a much improved probability of detecting whether or not a buried layer has an intrinsic IP response. Lastly, it is shown that the combination of an airborne transmitting loop and a downhole receiver would constitute an interesting and feasible exploration method. 
