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Since well logging began more than 80 years ago, the petroleum industry has relentlessly sought the true formation resistivity, Rt, the crucial property needed to estimate formation hydrocarbon saturation and reserves. Determining Rt, one of the earliest recognized challenges in well logging, is now going through a qualitative leap with the application of rigorous tool response modeling. This chapter looks at costs, benefits, and tool-specific issues involved in determining true formation resistivity.

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