The apparent or effective oil permeability, ''k''<sub>eo</sub> of one phase in the presence of a second phase can be arranged as the product of two terms: absolute permeability, ''k''<sub>a</sub>, and relative oil permeability, ''k''<sub>ro</sub>: | The apparent or effective oil permeability, ''k''<sub>eo</sub> of one phase in the presence of a second phase can be arranged as the product of two terms: absolute permeability, ''k''<sub>a</sub>, and relative oil permeability, ''k''<sub>ro</sub>: |