Originally Posted by

**vinomarky**
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At a high level* 'normalization' means making some changes to various data such that their characteristics can be compared in the same space

In this case* normalizing rel per curves usually involves

(a) Changing Sw to *normalized* water saturation which for oil/water is Swn = (Sw - Swir)/(1-Sor-Swir).

You now have rel perm data defined from Swn = 0 (residual water) to Swn=1.0 (Sw = 1-Sor)

(b) Dividing all the rel perm values by the rel perm to hydrocarbon at residual water* so that (for example* oil/water) at Swn=0* Kro=1. Sometimes this is also done for the water line

Now you have a family of rel perms* all spanning the same ranges* which you can compare/overlay and look for similarities/groupings in shape/curvature. If you do find a family shape characteristic* then you normally fit a corey type exponent to it* then try to fit a set of equations to predict the endpoints as a function of (for example) perm and/or facie. Given these relationships* you can now make a reasonable prediction of any of this family of rock in your reservoir.

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