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Employing a pulsed power deep induction device (XHR*) allows the application of a one foot layered resistivity model that includes apparent dip magnitude and produces a solution of Rt in dipping beds. This approach illustrates the problems and confusion created over conventional devices with various depths of investigation, magnified by the effects of dip. An example is presented in which the inversion solution for resistivity considering dip, is substantiated by the core evaluation. In this case, the new resistivity agreed with the core indicating that the thin sands were near irreducible water saturation. Once the resistivity is resolved of the sands considering dip in the one foot model inversion solution, an interbedded sand analysis can be applied to further improve the vertical resolution and data accuracy for beds thinner than one foot. Again, a simple approach can be applied to the evaluation of water saturation based on an assumed porosity.
* Mark of MPI
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ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES
1 Magnetic Pulse Incorporated, Fremont, California 94538, U.S.A.
Copyright © 2003 by The Society of Canadian Petroleum Geologists. All Rights Reserved.