Editor's note: This paper is a reprint of SPE OTC 15125. A related presentation was at the SPWLA 44th Annual Symposium, June 2003 by Iverson et al. “Geosteering using ultradeep resistivity on the Grane Field, Norwegian North Sea.”

Reading deep into the formation has always been an ojective of formation evaluation. Historically, when drilling vertical wells, reading deep involved imaging seismic reflectors with intermediate vertical seismic profile (VSP) runs to “look ahead” and to assess invasion or borehole damage with deep-resistivity devices.

With horizontal well drilling, measurements are now used to identify nearby bed boundaries for geosteering purposes. This technique...

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