Difference between revisions of "Subregional and local pressure compartments"

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==Subregional pressure compartments==
 
==Subregional pressure compartments==
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Revision as of 13:29, 3 July 2014

Exploring for Oil and Gas Traps
Series Treatise in Petroleum Geology
Part Critical elements of the petroleum system
Chapter Formation fluid pressure and its application
Author Edward A. Beaumont, Forrest Fiedler
Link Web page
Store AAPG Store

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

Subregional pressure compartments

Figure 1 is an example of a subregional compartment contained within the regional pressure compartment of the Anadarko basin of Figure 2.

Local pressure compartments

Figure 3 See text for explanation.

The fluids in a porous bioherm completely encased in shale (as shown in 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 faults.

See also

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Subregional and local pressure compartments
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