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→Methods for determining fluid contacts
| Most reliable for gas contacts Requires many pressure measurements for profile Requires accurate pressures
| Most reliable for gas contacts Requires many pressure measurements for profile Requires accurate pressures
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| Pressure profiles: reservoir tests [[Production testing|production tests]] [[Drill stem testing|drill stem tests]]
| rowspan = 2 | Pressure profiles: reservoir tests [[Production testing|production tests]] [[Drill stem testing|drill stem tests]] || rowspan = 2 | Estimates [[free water surface]] from pressures and fluid density measurements || rowspan = 2 | Makes use of widely available pressure data
| Estimates [[free water surface]] from pressures and fluid density measurements
| Makes use of widely available pressure data
| Imprecise; data usually require significant correction Only useful for thick hydrocarbon columns
| Imprecise; data usually require significant correction Only useful for thick hydrocarbon columns
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| Most reliable for gas contacts Requires pressure tests from both fluid zones and assumed or measured fluid densities to estimate contact Requires accurate pressures
| Most reliable for gas contacts Requires pressure tests from both fluid zones and assumed or measured fluid densities to estimate contact Requires accurate pressures
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