PERMEABILITY FROM POROSITY and SATURATION
Permeability from Wyllie-Rose Method
 
Permeability from the
Wylie-Rose Method
This is one of the oldest permeability methods available, and
is reliable when calibrated to core data.
PERMw - Permeability from Wylie-Rose Method
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
Permeability from Morris - Biggs parameters
Permeability from Timur parameters
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
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