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===Hydrodynamic effect on traps===
 
===Hydrodynamic effect on traps===
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[[file:formation-fluid-pressure-and-its-application_fig5-37.png|300px|thumb|{{figure number|1}}Vectors and equipotential lines for a hydrocarbon accumulation in an anticline in a hydrodynamic environment. Modified. Copyright: North, 1985; courtesy Allen and Unwin.]]
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[[file:formation-fluid-pressure-and-its-application_fig5-37.png|300px|thumb|{{figure number|1}}Vectors and equipotential lines for a hydrocarbon accumulation in an anticline in a hydrodynamic environment. Modified. Copyright: North;<ref name=North1985>North, F. K., 1985, Petroleum Geology: London, Allen & Unwin, 246 p.</ref> courtesy Allen and Unwin.]]
    
In a hydrostatic environment, the free-water level of a trap is horizontal. In a hydrodynamic environment, the free-water level of a trap is tilted because the buoyant force (P<sub>b</sub>) is interfered with by the hydrodynamic force (P<sub>w</sub>). The resultant interference is the vector known as the confining force (P<sub>cf</sub>). U, an equipotential line, is perpendicular to P<sub>cf</sub> and is tilted because of the effect of P<sub>w</sub>. The diagram in [[:file:formation-fluid-pressure-and-its-application_fig5-37.png|Figure 1]] shows these vectors and the equipotential lines for a hydrocarbon [[accumulation]] in an anticline in a hydrodynamic environment.
 
In a hydrostatic environment, the free-water level of a trap is horizontal. In a hydrodynamic environment, the free-water level of a trap is tilted because the buoyant force (P<sub>b</sub>) is interfered with by the hydrodynamic force (P<sub>w</sub>). The resultant interference is the vector known as the confining force (P<sub>cf</sub>). U, an equipotential line, is perpendicular to P<sub>cf</sub> and is tilted because of the effect of P<sub>w</sub>. The diagram in [[:file:formation-fluid-pressure-and-its-application_fig5-37.png|Figure 1]] shows these vectors and the equipotential lines for a hydrocarbon [[accumulation]] in an anticline in a hydrodynamic environment.

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