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REFERENCE

The Indonesia PouponLeveaux Water Saturation EquationThe Indonesia water saturation equation by PouponLeveaux (1971), is one of best models to estimate SW in shaly rocks (VSH > 0). It usually behaves better than the Simandoux equation on fresh formation waters with salinities of 20,000 NaCl PPM or less for clastic environments. The Indonesia model is a closed mathematical formula easy to apply, that uses the regular parameters, a tortuosity, m porosity cementation exponent, and n water saturation exponent (no Cation Exchange Capacity data CEC is needed):
Besides correcting SW for higher matrix conductivities due to the clay minerals presence, (avoids too large water saturations like Archie, that may overlook pay zones), its closed mathematical expression has interesting properties:
The Indonesia equation may be tried as the default SW estimator for shaly reservoirs with fresh to brackish waters, and probably would benchmark better than the Simandoux equation when compared against reliable core laboratory data. The figure below compares the results of Archie, Simandoux, Indonesia, and Fertl models, against core SW data.
The figure below shows the GeolOil panel to compute water saturation using the Indonesia equation
The figure below shows the GeolOil panel to estimate the apparent water resistivity from the Indonesia model, corrected for VSH
The figure below shows the GeolOil panel to estimate the apparent cementation exponent m from the Indonesia model, corrected for VSH




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