Imaging of a subsurface conductivity distribution using a time‐domain electromagnetic borehole‐conveyed logging tool

This paper discusses the application of Time-domain ElectroMagnetics (TEM) in a borehole-conveyed logging tool. Defining concepts like apparent conductivity, apparent dip and apparent azimuth, we show that such a tool may be used to image the conductivity distribution around and ahead of the drill bit at comparatively large distances from the borehole. As such, a TEM tool would be instrumental in optimal placement of a well in a hydrocarbon reservoir.