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→Methods for determining fluid contacts
| [[Production problems#Water-gas coning|Coning]], [[degassing]], etc. may lead to anomalous recoveries
| [[Production problems#Water-gas coning|Coning]], [[degassing]], etc. may lead to anomalous recoveries
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| rowspan = 2 | [[Calculating Sw from the Archie equation|Saturation determination: well logs]] || Estimates fluid contacts from changes in fluid saturations or mobility with depth || Low cost Accurate in simple lithologies || Saturation must be calibrated to production
| rowspan = 2 | [[Calculating Sw from the Archie equation|Saturation determination: well logs]] || Estimates fluid contacts from changes in fluid saturations or mobility with depth || Low cost Accurate in simple lithologies || rpwspan = 2 | Saturation must be calibrated to production
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| Rapid High resolution || Unreliable in complex lithologies or low resistivity sands
| Rapid High resolution || Unreliable in complex lithologies or low resistivity sands