
TY  - JOUR
A1  - Raiche, A.P. 
A1  - Bennett, L.A. 
T1  - Layered earth models using downhole electromagnetic receivers
JF  - Exploration Geophysics
JO  - Explor. Geophys.
Y1  - 1987
VL  - 18
IS  - 3
SP  - 325
EP  - 329
KW  - 
UR  - https://doi.org/10.1071/EG987325 
N2  - 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. 
ER  -

