Improved resolution in estimating fonnation resistivities can provide more accurate values of residual and movable hydrocarbon saturations. Routinely, fonnation resistivity infonnation derived from galvanic and induction logging measurements are interpreted independently. As a result, several models of fonnation resistivity can emerge that are typically not consistent. Here, we illustrate how simultaneous inversion of data from galvanic and induction tools can yield more consistent and better resolved parameters. When measuring fonnation resistivities, differentReferences and illustrations at end of paper 1059 SPE26976 Simultaneous Inversion of Galvanic and Induction Logging Measurements to Improve Resolution 2 complete concept of resolution is proposed that involves earth model, measuring device, data noise, and interpretation technique as components.A number of earth models and tool combinations (Dual Laterolog, Dual Induction, Thin Bed Resistivity Tool, Microlaterolog) are analyzed and discussed under the framework of the proposed resolution concept. The analysis clearly shows the advantages of combining data from different instruments to improve interpreted results.
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