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→What is the Archie equation?
Archie<ref name=ch09r2>Archie, G., E., 1952, [http://archives.datapages.com/data/bulletns/1949-52/data/pg/0036/0002/0250/0278.htm Classification of carbonate reservoir rocks and petrophysical considerations]: AAPG Bulletin, vol. 36, no. 2, p. 218–298. ''A classic paper written way before its time.''</ref> developed his famous equation to calculate, from well log parameters, the water saturation (S<sub>w</sub>) of the uninvaded zone in a formation next to a borehole. The Archie equation can be expressed as follows:
Archie<ref name=ch09r2>Archie, G., E., 1952, [http://archives.datapages.com/data/bulletns/1949-52/data/pg/0036/0002/0250/0278.htm Classification of carbonate reservoir rocks and petrophysical considerations]: AAPG Bulletin, vol. 36, no. 2, p. 218–298. ''A classic paper written way before its time.''</ref> developed his famous equation to calculate, from well log parameters, the water saturation (S<sub>w</sub>) of the uninvaded zone in a formation next to a borehole. The Archie equation can be expressed as follows:
:<math>\mbox{S}_{\rm w}{}^{\rm n} = \frac{\mbox{R}_{\rm w}}{(\Phi^{\rm m} \cdot \mbox{R}_{\rm t})}</math>
:<math>\mbox{S}_{\rm w}{}^{\rm n} = \frac{\mbox{R}_{\rm w}}{(\Phi^{\rm m} \times \mbox{R}_{\rm t})}</math>
where:
where: