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Pore system shapes
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Revision as of 18:34, 21 August 2014
426 bytes added
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18:34, 21 August 2014
→Archie and non-Archie rocks
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:<math>\mbox{S}_{\rm w} = \left(\frac{1}{\Phi^{\rm m}} \times \frac{\mbox{R}_{\rm w}}{\mbox{R}_{\rm t}}\right)^{\rm 1/n}</math>
:<math>\mbox{S}_{\rm w} = \left(\frac{1}{\Phi^{\rm m}} \times \frac{\mbox{R}_{\rm w}}{\mbox{R}_{\rm t}}\right)^{\rm 1/n}</math>
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where:
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* S<sub>w</sub> = water saturation of the uninvaded zone
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* n = saturation exponent, which varies from 1.8 to 4.0 but normally is 2.0
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* R<sub>w</sub> = formation water resistivity at formation temperature
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* Φ = [[porosity]]
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* m = cementation exponent, which varies from 1.7 to 3.0 but normally is 2.0
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* R<sub>t</sub> = true resistivity of the formation, corrected for invasion, borehole, thin bed, and other effects
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without modification. To predict water saturation in rocks with non-Archie porosity, we modify the Archie equation.
without modification. To predict water saturation in rocks with non-Archie porosity, we modify the Archie equation.
FWhitehurst
4,231
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