Method for the characterization of geological formations
AssigneeSchlumberger Technology Corporation
InventorBernard Montaron
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Abstract
A method for determining the water saturation of an underground formation traversed by a borehole, the method composing: determining a first parameter (μ) that is representative of the critical exponent of the electrical conductivity of the formation: determining a second parameter (Wc or Sc or φc) that is representative of the formation percolation threshold; measuring a first set of formation properties; and combining, said first set of formation properties, first and second parameters in order to determine the water saturation (Sw) of said underground formation.
Claims14
A method for determining the water saturation of an underground formation traversed by a borehole using a formation system, the method comprising:
- operating one or more tools of the formation system in a borehole to measure a first set of formation properties among the list of formation resistivity (Rt), formation porosity (φ), water formation resistivity (RW);
- using the formation system to determine a first parameter (μ) that is representative of a critical exponent of an electrical conductivity of the formation;
- using the formation system to determine a second parameter (Wc or Sc or φc) that is representative of a formation percolation threshold;
- and
- using one or more processors in the formation system to combine the first set of formation properties, the first parameter, and the second parameter in order to determine the water saturation (SW) of the underground formation.
Dependencies are inferred from the claim text.