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Subregional or local (second- and third-order) pressure compartments can be found within normal pressure regimes or regional pressure compartments.

Subregional or local (second- and third-order) [[pressure compartments]] can be found within normal pressure regimes or [[regional pressure compartments]].

==Subregional pressure compartments==

==Subregional pressure compartments==

[[file:formation-fluid-pressure-and-its-application_fig5-26.png|thumb|{{figure number|1}}.]]

[[file:formation-fluid-pressure-and-its-application_fig5-26.png|thumb|{{figure number|1}}.]]

[[:file:formation-fluid-pressure-and-its-application_fig5-26.png|Figure 1]] 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|Figure 1]] is an example of a subregional compartment contained within the regional pressure compartment of the [[Anadarko basin]] of Figure 5-25.

==Local pressure compartments==

==Local pressure compartments==

[[file:formation-fluid-pressure-and-its-application_fig5-27.png|thumb|{{figure number|2}}See text for explanation.]]

[[file:formation-fluid-pressure-and-its-application_fig5-27.png|thumb|{{figure number|2}}See text for explanation.]]

The fluids in a porous bioherm completely encased in shale (as shown in [[:file:formation-fluid-pressure-and-its-application_fig5-27.png|Figure 2]]) 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.

The fluids in a [[Porosity#Carbonate pore systems|porous]] [[bioherm]] completely encased in shale (as shown in [[:file:formation-fluid-pressure-and-its-application_fig5-27.png|Figure 2]]) 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 fault]]s.

==See also==

==See also==