This paper presents the theoretical, experimental, and operational bases of a practical procedure for decomposing total porosity into its basic components, i.e., primary, secondary, fracture, and vug porosities. The procedure makes use of total porosity and formation resistivity factor data obtained through geophysical well logs, and is based on a general formulation which has as particular cases all other formulations commonly used to relate formation resistivity factor and porosity, such as Maxwell, Fricke, Archie and generalized Archie equations. To visualize its potential as a tool for interpreting well logs, an application example is presented.

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