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→Archie and non-Archie rocks
==Archie and non-Archie rocks==
==Archie and non-Archie rocks==
Choquette and Pray's<ref name=ch09r10>Choquette, P., W., Pray, L., C., 1970, [http://archives.datapages.com/data/bulletns/1968-70/data/pg/0054/0002/0200/0207.htm Geologic nomenclature and classification of porosity in sedimentary carbonates]: AAPG Bulletin, vol. 54, no. 2, p. 207–250. Classic reference for basic concepts regarding carbonate porosity.</ref> porosity types include two different groups of pore system shapes: petrophysically simple '''Archie porosity''' and petrophysically complex '''non-Archie porosity'''. In most cases, water saturation (S<sub>w</sub>) of rocks with Archie porosity can be predicted from log analysis using the Archie equation
Choquette and Pray's<ref name=ch09r10>Choquette, P., W., Pray, L., C., 1970, [http://archives.datapages.com/data/bulletns/1968-70/data/pg/0054/0002/0200/0207.htm Geologic nomenclature and classification of porosity in sedimentary carbonates]: AAPG Bulletin, vol. 54, no. 2, p. 207–250. Classic reference for basic concepts regarding carbonate porosity.</ref> porosity types include two different groups of pore system shapes: petrophysically simple '''Archie porosity''' and petrophysically complex '''non-Archie porosity'''. In most cases, water saturation (S<sub>w</sub>) of rocks with Archie porosity can be predicted from log analysis using the [[Archie equation]]
:<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>