Changes

{{publication  

{{publication  

  | image  = exploring-for-oil-and-gas-traps.png

  | image  = exploring-for-oil-and-gas-traps.png

  | part    = Critical elements of the petroleum system

  | part    = Critical elements of the petroleum system

  | chapter = Formation fluid pressure and its application

  | chapter = Formation fluid pressure and its application

  | frompg  = 5-1

  | frompg  = 5-48

  | topg    = 5-64

  | topg    = 5-48

  | author  = Edward A. Beaumont, Forrest Fiedler

  | author  = Edward A. Beaumont, Forrest Fiedler

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm

==Subregional pressure compartments==

==Subregional pressure compartments==

<gallery mode=packed widths=200px heights=200px>

<gallery mode=packed widths=300px heights=300px>

formation-fluid-pressure-and-its-application_fig5-26.png|{{figure number|1}}.

formation-fluid-pressure-and-its-application_fig5-26.png|{{figure number|1}}Example of a subregional compartment contained within the regional pressure compartment of the Anadarko basin. From Al-Shaieb et al.;<ref>Al-Shaieb, Z., J. O. Puckette, A. A. Abdalla, and P. B. Ely, 1995b, [http://archives.datapages.com/data/specpubs/memoir61/ch05/0069.htm Three levels of compartmentation within the overpressured interval of the Anadarko basin], in P. J. Ortoleva, ed., Basin Compartments and Seals: [http://store.aapg.org/detail.aspx?id=748 AAPG Memoir 61], p. 69–83.</ref> courtesy AAPG.

formation-fluid-pressure-and-its-application_fig5-25.png|{{figure number|2}}.

formation-fluid-pressure-and-its-application_fig5-25.png|{{figure number|2}}Pressure–depth plot of a well through the Anadarko regional pressure compartment. Modified from Al-Shaieb et al.;<ref>Al-Shaieb, Z., J. O. Puckette, A. A. Abdalla, and P. B. Ely, 1995a, [http://archives.datapages.com/data/specpubs/memoir61/ch04/0055.htm Megacompartment complex in the Anadarko basin], in P. J. Ortoleva, ed., Basin Compartments and Seals: [http://store.aapg.org/detail.aspx?id=748 AAPG Memoir 61], p. 55–68.</ref> courtesy AAPG.

</gallery>

</gallery>

==Local pressure compartments==

==Local pressure compartments==

[[file:formation-fluid-pressure-and-its-application_fig5-27.png|300px|thumb|{{figure number|3}}See text for explanation.]]

[[file:formation-fluid-pressure-and-its-application_fig5-27.png|400px|thumb|{{figure number|3}}Porous bioherm completely encased in shale.]]

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 3]]) 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.

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 3]]) 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.

* [[Pressure compartment seals]]

* [[Pressure compartment seals]]

* [[Applying pressure compartment concepts to exploration]]

* [[Applying pressure compartment concepts to exploration]]

==External links==

==External links==

[[Category:Critical elements of the petroleum system]]  

[[Category:Critical elements of the petroleum system]]  

[[Category:Formation fluid pressure and its application]]

[[Category:Formation fluid pressure and its application]]