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| | part = Predicting the occurrence of oil and gas traps | | | part = Predicting the occurrence of oil and gas traps |
| | chapter = Predicting reservoir system quality and performance | | | chapter = Predicting reservoir system quality and performance |
− | | frompg = 9-1 | + | | frompg = 9-38 |
− | | topg = 9-156 | + | | topg = 9-39 |
| | author = Dan J. Hartmann, Edward A. Beaumont | | | author = Dan J. Hartmann, Edward A. Beaumont |
| | link = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm | | | link = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm |
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| ==Steady-state permeability equation== | | ==Steady-state permeability equation== |
| | | |
− | [[file:predicting-reservoir-system-quality-and-performance_fig9-24.png|300px|thumb|{{figure number|1}}See text for explanation.]] | + | [[file:predicting-reservoir-system-quality-and-performance_fig9-24.png|300px|thumb|{{figure number|1}}Illustration of variables.]] |
| | | |
| [[Permeability]] is not measured; it is calculated. The steady-state equation for calculating permeability (using an integrated form of Darcy's law) is | | [[Permeability]] is not measured; it is calculated. The steady-state equation for calculating permeability (using an integrated form of Darcy's law) is |
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| * P<sub>1</sub> = pressure at input end, atm | | * P<sub>1</sub> = pressure at input end, atm |
| * P<sub>2</sub> = pressure at output end, atm | | * P<sub>2</sub> = pressure at output end, atm |
− | * μ = air viscosity, cp | + | * μ = air [[viscosity]], cp |
| | | |
| The diagram of a plug in [[:file:predicting-reservoir-system-quality-and-performance_fig9-24.png|Figure 1]] illustrates some of these variables. | | The diagram of a plug in [[:file:predicting-reservoir-system-quality-and-performance_fig9-24.png|Figure 1]] illustrates some of these variables. |
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| ==Example== | | ==Example== |
| | | |
− | [[file:predicting-reservoir-system-quality-and-performance_fig9-25.png|400px|thumb|{{figure number|2}}See text for explanation.]] | + | [[file:predicting-reservoir-system-quality-and-performance_fig9-25.png|400px|thumb|{{figure number|2}}Two flow units.]] |
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− | In [[:file:predicting-reservoir-system-quality-and-performance_fig9-25.png|Figure 2]], flow unit 1 is a sucrosic dolomite. On a face of a plug of flow unit 1, a very large number of very small pore throats (capillaries) occur, resulting in a measurable flow (Q). That Q, at a measured cross-sectional area A of the plug, yields a K<sub>a</sub> of approximately 20 md. | + | In [[:file:predicting-reservoir-system-quality-and-performance_fig9-25.png|Figure 2]], flow unit 1 is a sucrosic [[dolomite]]. On a face of a plug of flow unit 1, a very large number of very small pore throats (capillaries) occur, resulting in a measurable flow (Q). That Q, at a measured cross-sectional area A of the plug, yields a K<sub>a</sub> of approximately 20 md. |
| | | |
| The sample from flow unit 2 with the same A has fewer, larger pore throats (capillaries) exposed in the face of the plug. If the Q for flow unit 2 is slightly lower than flow unit 1, then the K<sub>a</sub> will be lower (by using the same A). | | The sample from flow unit 2 with the same A has fewer, larger pore throats (capillaries) exposed in the face of the plug. If the Q for flow unit 2 is slightly lower than flow unit 1, then the K<sub>a</sub> will be lower (by using the same A). |
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| [[Category:Predicting the occurrence of oil and gas traps]] | | [[Category:Predicting the occurrence of oil and gas traps]] |
| [[Category:Predicting reservoir system quality and performance]] | | [[Category:Predicting reservoir system quality and performance]] |
| + | [[Category:Treatise Handbook 3]] |