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No change in size ,  19:10, 10 March 2014
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[[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.]]
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===[[Porosity]]===
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===Porosity===
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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.
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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===
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