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→Methods for determining fluid contacts
! Limitations
! Limitations
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| Fluid sampling: production tests drill stem tests RFT tests
| Fluid sampling: [[Production testing|production tests]] [[Drill stem testing|drill stem tests]] [[Repeat formation tester|RFT]] tests
| Directly determines fluid contacts by measuring recovered fluids
| Directly determines fluid contacts by measuring recovered fluids
| Direct measure of fluid contact
| Direct measure of fluid contact
| Coning, degassing, etc. may lead to anomalous recoveries
| Coning, degassing, etc. may lead to anomalous recoveries
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| Saturation determination: well logs
| [[Calculating Sw from the Archie equation|Saturation determination: well logs]]
| Estimates fluid contacts from changes in fluid saturations or mobility with depth
| Estimates fluid contacts from changes in fluid saturations or mobility with depth
| Low cost Accurate in simple lithologies
| Low cost Accurate in simple lithologies
| Unreliable in complex lithologies or low resistivity sands
| Unreliable in complex lithologies or low resistivity sands
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| Saturation determination: core analyses
| Saturation determination: [[Overview of routine core analysis|core analyses]]
| Estimates fluid contacts from changes in fluid saturation with depth
| Estimates fluid contacts from changes in fluid saturation with depth
| Saturation estimates for complex lithologies
| Saturation estimates for complex lithologies