Difference between revisions of "Seal capacity and two-phase hydrocarbon columns"
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| + | {{merge|Seal capacity}} | ||
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{{publication | {{publication | ||
| image = exploring-for-oil-and-gas-traps.png | | image = exploring-for-oil-and-gas-traps.png | ||
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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- | + | | frompg = 10-79 |
| − | | topg = 10- | + | | topg = 10-79 |
| 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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==Two phases are better than one== | ==Two phases are better than one== | ||
| − | Seal capacity depends on both the hydrocarbon phase and the physical character of the top seal. Since displacement pressure is a function of the seal and the coefficient of interfacial tension of the hydrocarbon phase beneath the seal, it is possible to trap a thicker two-phase hydrocarbon column than oil alone or gas alone.<ref name=ch10r92>Watts, N., L., 1987, Theoretical aspects of cap-rock and fault seals for single and two-phase hydrocarbon columns: Marine and Petroleum Geology, vol. 4, no. 4, p. 274–307., 10., 1016/0264-8172(87)90008-0</ref> The gas in contact with the base of the seal determines the displacement pressure (P<sub>d)</sub> of the seal. The buoyant effect of the oil column, however, is less than that of a pure gas column, and a greater total hydrocarbon column can be trapped. | + | [[Seal capacity]] depends on both the hydrocarbon phase and the physical character of the top seal. Since [[Top seal displacement pressure|displacement pressure]] is a function of the seal and the [[coefficient of interfacial tension]] of the [[hydrocarbon phase]] beneath the seal, it is possible to trap a thicker two-phase hydrocarbon column than oil alone or gas alone.<ref name=ch10r92>Watts, N., L., 1987, Theoretical aspects of cap-rock and fault seals for single and two-phase hydrocarbon columns: Marine and Petroleum Geology, vol. 4, no. 4, p. 274–307., 10., 1016/0264-8172(87)90008-0</ref> The gas in contact with the base of the seal determines the [[displacement pressure]] (P<sub>d)</sub> of the seal. The [[Buoyancy forces in reservoir fluids|buoyant effect]] of the oil column, however, is less than that of a pure gas column, and a greater total [[hydrocarbon column]] can be trapped. |
==Single phase vs. two phase== | ==Single phase vs. two phase== | ||
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| − | [[file:evaluating-top-and-fault-seal_fig10-52.png|thumb|{{figure number| | + | [[file:evaluating-top-and-fault-seal_fig10-52.png|300px|thumb|{{figure number|1}}Comparison of the seal capacity of a top seal with a single-phase oil accumulation, a single-phase gas accumulation, and a two-phase accumulation with both an oil leg and a gas cap. After Watts.<ref name=ch10r92 /> Copyright: Marine and Petroleum Geology.]] |
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| + | [[:file:evaluating-top-and-fault-seal_fig10-52.png|Figure 1]] compares the [[seal capacity]] of a top seal with a single-phase oil [[accumulation]], a single-phase gas accumulation, and a two-phase accumulation with both an [http://www.answers.com/Q/What_is_oil_leg_reservoir oil leg] and a [http://www.glossary.oilfield.slb.com/en/Terms/g/gas_cap.aspx gas cap]. The largest [[hydrocarbon column]] is sealed by the two-phase accumulation. This best applies to [[trap]]s with a geometry such that only the gas column is in contact with the seal. It also applies to [[Fault trap regime|fault traps]]. | ||
==See also== | ==See also== | ||
* [[Seal capacity]] | * [[Seal capacity]] | ||
* [[Seal capacity of different rock types]] | * [[Seal capacity of different rock types]] | ||
| − | * [[ | + | * [[Seal capacity variation with depth and hydrocarbon phase]] |
* [[Seal thickness]] | * [[Seal thickness]] | ||
* [[Fault-dependent leak points, continuity, and charge]] | * [[Fault-dependent leak points, continuity, and charge]] | ||
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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]] | ||
Latest revision as of 20:56, 31 March 2022
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It has been suggested that this article be merged with [[::Seal capacity|Seal capacity]]. (Discuss) |
| Exploring for Oil and Gas Traps | |
| |
| Series | Treatise in Petroleum Geology |
|---|---|
| Part | Predicting the occurrence of oil and gas traps |
| Chapter | Evaluating top and fault seal |
| Author | Grant M. Skerlec |
| Link | Web page |
| Store | AAPG Store |
Two phases are better than one
Seal capacity depends on both the hydrocarbon phase and the physical character of the top seal. Since displacement pressure is a function of the seal and the coefficient of interfacial tension of the hydrocarbon phase beneath the seal, it is possible to trap a thicker two-phase hydrocarbon column than oil alone or gas alone.[1] The gas in contact with the base of the seal determines the displacement pressure (Pd) of the seal. The buoyant effect of the oil column, however, is less than that of a pure gas column, and a greater total hydrocarbon column can be trapped.
Single phase vs. two phase
Figure 1 Comparison of the seal capacity of a top seal with a single-phase oil accumulation, a single-phase gas accumulation, and a two-phase accumulation with both an oil leg and a gas cap. After Watts.[1] Copyright: Marine and Petroleum Geology.
Figure 1 compares the seal capacity of a top seal with a single-phase oil accumulation, a single-phase gas accumulation, and a two-phase accumulation with both an oil leg and a gas cap. The largest hydrocarbon column is sealed by the two-phase accumulation. This best applies to traps with a geometry such that only the gas column is in contact with the seal. It also applies to fault traps.
See also
- Seal capacity
- Seal capacity of different rock types
- Seal capacity variation with depth and hydrocarbon phase
- Seal thickness
- Fault-dependent leak points, continuity, and charge
References
External links
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