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US 4,786,873 AGranted
Method for evaluating water saturation in petroleum reservoirs from dielectric permittivity
AssigneeAmoco Corporation
InventorMichael M. Sherman
Life of this patent
Estimating the term…
Abstract
A new functional parameter reprsentative of the geometrical distribution of matrix material and the variable geometrical distribution of hydrocarbon and water in pore spaces in a porous earth formation is determined and is used to evaluate, or to determine, water saturation of the formation from dielectric permittivity measurements.
Claims7
A method for determining the water saturation of a porous hydrocarbon and water-bearing earth formation, said process comprising the steps of:
- obtaining a first formation parameter, .phi..sub.c, which is based upon dielectric permittivity data and represents a measure of water-filled porosity of said formation and which takes into account the geometrical distribution of rock and water in said earth formation;
- obtaining a second formation parameter, .phi..sub.t, which is based upon the total porosity of the rock containing both water and hydrocarbon in said formation;
- and
- determining a value for water saturation, S.sub.w, of said earth formation having improved accuracy and reliability by functionally relating said first formation parameter to said second formation parameter by a functional third formation parameter, k, according to the equation S.sub.w =[.phi..sub.c /.phi..sub.t ]1/k.
1 more element
Dependencies are inferred from the claim text.