Changes

[[file:subsurface-maps_fig5.png|thumb|left|{{figure number|5}}Porosity-weighted average water saturation map for Layer 2 of a Middle Eastern carbonate reservoir.]]

[[file:subsurface-maps_fig5.png|thumb|left|{{figure number|5}}Porosity-weighted average water saturation map for Layer 2 of a Middle Eastern carbonate reservoir.]]

===[[Porosity]]===

===Porosity===

The porosity (ϕ) in a reservoir zone can be determined from log and/or core data. The data in an individual well within the net pay interval can be averaged arithmetically and posted on a map for contouring. The averages should be weighted by thickness.

The [[porosity]] (ϕ) in a reservoir zone can be determined from log and/or core data. The data in an individual well within the net pay interval can be averaged arithmetically and posted on a map for contouring. The averages should be weighted by thickness.

===Water saturation===

===Water saturation===