The capability of a new ultra-deep resistivity measurement has been studied. The new measurement targets the detection of remote bed boundaries up to 10m away from the drill bit. Based on a numerical modelling and sensitivity study, we have arrived at a set of optimal tool parameters. A three-coil system was used with transmitter-receiver spacings of 12m and 17m. Two operating frequencies were chosen: 20 and 50kHz. These parameters yield optimal performance in terms of measurement sensitivity to a remote bed boundary. To interpret the data, we implemented an inversion method to quantitatively determine the distance from the tool to a remote bed. We have also investigated the impact of the nature of the resistivity transition zone on the distance determination

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