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Abstract

  1. In carbonate reservoirs with intergranular (carbonate grainstones) and intercrystalline (sucrosic dolomite) porosity, reliable water saturation (Sw) values can be obtained using the standard Archie equation: Sw = (F x Rw/Rt)172 with F = l/ø2 (i.e., m =2.0).

  2. In carbonate reservoirs with vuggy or moldic porosity, the standard Archie equation often gives overly optimistic water saturations because of the more complex pore geometry (i.e., m > 2.0).

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