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| | part = Predicting the occurrence of oil and gas traps | | | part = Predicting the occurrence of oil and gas traps |
| | chapter = Evaluating top and fault seal | | | chapter = Evaluating top and fault seal |
− | | frompg = 10-1 | + | | frompg = 10-68 |
− | | topg = 10-94 | + | | topg = 10-68 |
| | author = Grant M. Skerlec | | | author = Grant M. Skerlec |
| | link = http://archives.datapages.com/data/specpubs/beaumont/ch10/ch10.htm | | | link = http://archives.datapages.com/data/specpubs/beaumont/ch10/ch10.htm |
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| }} | | }} |
| ==Calculation== | | ==Calculation== |
− | The maximum [[Hydrocarbon column|column of hydrocarbons]] that can accumulate under a [[seal]] occurs when the [[Buoyant pressure|buoyancy pressure]],''P''<sub>b</sub>, equals the [[displacement pressure]], ''P''<sub>d</sub>. If ''P''<sub>b</sub> exceeds ''P''<sub>d</sub>, the hydrocarbons will leak through the seal. If ''P''<sub>b</sub> is less than ''P''<sub>d</sub>, it would be possible to seal a greater column of hydrocarbons. | + | The maximum [[Hydrocarbon column|column of hydrocarbons]] that can accumulate under a [[seal]] occurs when the [[buoyancy pressure]], ''P''<sub>b</sub>, equals the [[displacement pressure]], ''P''<sub>d</sub>. If ''P''<sub>b</sub> exceeds ''P''<sub>d</sub>, the hydrocarbons will leak through the seal. If ''P''<sub>b</sub> is less than ''P''<sub>d</sub>, it would be possible to seal a greater column of hydrocarbons. |
| | | |
| Therefore, for the maximum hydrocarbon column | | Therefore, for the maximum hydrocarbon column |
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| | | |
| ==Effect on seal capacity== | | ==Effect on seal capacity== |
− | The height of the [[hydrocarbon column]] (h) in the above equations is a theoretical maximum. The actual height is less because of the effect of the reservoir. If the reservoir itself had zero [[displacement pressure]], the height of the hydrocarbon column would attain the theoretical maximum and the oil=water contact would coincide with the [[free water level]]. If the reservoir has some displacement pressure greater than zero, then the height of the hydrocarbon column is less than the theoretical maximum, or | + | The height of the [[hydrocarbon column]] (h) in the above equations is a theoretical maximum. The actual height is less because of the effect of the reservoir. If the reservoir itself had zero [[displacement pressure]], the height of the hydrocarbon column would attain the theoretical maximum and the [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=oil-water+contact oil-water contact] would coincide with the [[free water level]]. If the reservoir has some displacement pressure greater than zero, then the height of the hydrocarbon column is less than the theoretical maximum, or |
| | | |
| :<math>\mbox{h} = \left(\frac{\mbox{P}_{\rm ds} - \mbox{P}_{\rm dr}}{\rho_{\rm w} - \rho_{\rm h}}\right) 0.433</math> | | :<math>\mbox{h} = \left(\frac{\mbox{P}_{\rm ds} - \mbox{P}_{\rm dr}}{\rho_{\rm w} - \rho_{\rm h}}\right) 0.433</math> |
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| ==See also== | | ==See also== |
| * [[How capillary properties control seal]] | | * [[How capillary properties control seal]] |
− | * [[Buoyant pressure]] | + | * [[Buoyancy pressure]] |
| * [[Top seal displacement pressure]] | | * [[Top seal displacement pressure]] |
| | | |
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| [[Category:Predicting the occurrence of oil and gas traps]] | | [[Category:Predicting the occurrence of oil and gas traps]] |
| [[Category:Evaluating top and fault seal]] | | [[Category:Evaluating top and fault seal]] |
| + | [[Category:Treatise Handbook 3]] |