Permeability from the Wylie-Rose Method
This is one of the oldest permeability methods available, and is reliable when calibrated to core data.

      1: PERMw = CPERM * (PHIe ^ DPERM) / (SWir ^ EPERM)

WHERE:
  CPERM = permeability constant (fractional)
  DPERM = porosity exponent (fractional)
  EPERM = irreducible saturation exponent (fractional)
  PERMw = permeability (millidarcies)
  PHIe = effective porosity from any method (fractional)
  SWir = irreducible water saturation (fractional)

COMMENTS:
Different researchers have found a variety of exponents based on core analysis studies, and the analyst may find many more in the literature or company files.

RECOMMENDED PARAMETERS:
RESEARCHER                   CPERM              DPERM   EPERM
                                        OIL   GAS
Morris-Biggs                   65000 6500              6.0           2.0
Timur                               3400 340                4.4           2.0

NUMERICAL EXAMPLE:
Assume data from Classic Example Sand B.
PHIe = 0.30
SWir = Sw = 0.25

Wylie-Rose formula / Morris-Biggs parameters:
CPERM = 62500
DPERM = 6.0
EPERM = 2.0
PERMw = 62500 * (0.30 ^ 6) / (0.25 ^ 2) = 730 md



Permeability from Morris - Biggs parameters


 Permeability from Timur parameters

"META/PERM"  Compare Permeability Calculated from Various Methods
         
 

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