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[[file:formation-fluid-pressure-and-its-application_fig5-38.png|300px|thumb|{{figure number|1}}Map showing oil in a hydrodynamic trap (shaded area). Copyright: Dahlberg;<ref name=Dahlberg1994>Dahlberg, E. C., 1994, Applied Hydrodynamics in Petroleum Exploration, 2nd ed.: New York, Springer-Verlag, 295 p</ref> courtesy Springer-Verlag.]]
[[file:formation-fluid-pressure-and-its-application_fig5-38.png|300px|thumb|{{figure number|1}}Map showing oil in a hydrodynamic trap (shaded area). Copyright: Dahlberg;<ref name=Dahlberg1994>Dahlberg, E. C., 1994, Applied Hydrodynamics in Petroleum Exploration, 2nd ed.: New York, Springer-Verlag, 295 p</ref> courtesy Springer-Verlag.]]
The map in [[:file:formation-fluid-pressure-and-its-application_fig5-38.png|Figure 1]] shows oil in a hydrodynamic trap (shaded area). No oil could be trapped in the structure, represented by solid [[contour]]s, without the aid of hydrodynamics. The bold contours with long dashes represent the isopotential of oil (labeled U<sub>0</sub>). To make U<sub>o</sub> contours, follow this procedure.
The map in [[:file:formation-fluid-pressure-and-its-application_fig5-38.png|Figure 1]] shows oil in a hydrodynamic trap (shaded area). No oil could be trapped in the structure, represented by solid [[contour]]s, without the aid of [[hydrodynamics]]. The bold contours with long dashes represent the isopotential of oil (labeled U<sub>0</sub>). To make U<sub>o</sub> contours, follow this procedure.
# Subtract the structure of the target formation (Z) from the isopotential of water (V<sub>o</sub> ).
# Subtract the structure of the target formation (Z) from the isopotential of water (V<sub>o</sub> ).