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This chapter describes a process of 1-D and 2-D resistivity modeling as a tool for formation evaluation. A modeling flow chart was developed based on applying resistivity modeling for formation evaluation in numerous wells. The chapter ends with a list of considerations when evaluating resistivity-modeling software packages.

Resistivity-tool-response modeling as a formation-evaluation tool is about inversion, and geophysical data inversion yields a non-unique formation-resistivity profile. Hence, the inverse modeling process must begin with good quality data and solid integration of geological and geophysical constraints derived from various measurements to achieve a rational result with minimum uncertainty.

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