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{{publication
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Critical elements of the petroleum system
| chapter = Formation fluid pressure and its application
| frompg = 5-1
| topg = 5-64
| author = Edward A. Beaumont, Forrest Fiedler
| link = http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
Subregional or local (second- and third-order) pressure compartments can be found within normal pressure regimes or regional pressure compartments.

==Subregional pressure compartments==
Below is an example of a subregional compartment contained within the regional pressure compartment of the Anadarko basin of Figure 5-25.

[[file:formation-fluid-pressure-and-its-application_fig5-26.png|thumb|{{figure number|5-26}}.]]

==Local pressure compartments==
The fluids in a porous bioherm completely encased in shale (as shown in the figure below) are virtually isolated from the nearby fluid systems outside the bioherm. The bioherm, then, is a pressure compartment that may or may not be abnormally pressured. Other geological features that may form local pressure compartments are fault blocks, sand lenses, and sand wedges developed in growth faults.

[[file:formation-fluid-pressure-and-its-application_fig5-27.png|thumb|{{figure number|5-27}}See text for explanation.]]

==See also==
* [[Pressure compartments]]
* [[Regional pressure compartments]]
* [[Pressure compartment seals]]
* [[Applying pressure compartment concepts to exploration]]

==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]

[[Category:Critical elements of the petroleum system]]
[[Category:Formation fluid pressure and its application]]

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