A computerized process is presented which allows the determination of primary and secondary porosities, and water saturation in the primary porosity, secondary porosity, and composite system, in naturally fractured reservoirs.

The process utilizes conventional well logs such as resistivity, density, neutron, and sonic.

The theoretical background behind the interpretation techniques is presented with examples of its application in the recompletion of an Austin Chalk well, and in the completion of fractured carbonate rocks in the Williston basin of Montana and in Canada.

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