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| ! Limitations | | ! Limitations |
| |- | | |- |
− | | 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 |
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| | Coning, degassing, etc. may lead to anomalous recoveries | | | Coning, degassing, etc. may lead to anomalous recoveries |
| |- | | |- |
− | | 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 |
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| | Unreliable in complex lithologies or low resistivity sands | | | Unreliable in complex lithologies or low resistivity sands |
| |- | | |- |
− | | 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 |