Modified Lak wettability index

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In petroleum engineering, the modified Lak wettability index is a quantitative tool to determine the wettability of reservoir rocks from relative permeability measurements. This index is based on the areas below the water and oil relative permeability curves. This index is a modification of Lak wettability index

$I_{{M}{L}}=\frac{A_{{o}}-A_{{w}}}{A_{{o}}+A_{{w}}}$

where

$I_{{M}{L}}$ : modified Lak wettability index (index values near -1 and 1 represent strongly oil-wet and strongly water-wet rocks, respectively)

$A_{{o}}$ : Area under the oil relative permeability curve

$A_{{w}}$ : Area under the water relative permeability curve

See also

• Wetting
• Amott test
• Relative permeability
• TEM-function
• Lak wettability index

References

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