When a reservoir has formed in a trap and has come to pressure equilibrium with the water in the aquifer, the pore pressure of the hydrocarbons at different depths in the reservoir plot along a steeper gradient than the water gradient. [[:file:predicting-reservoir-system-quality-and-performance_fig9-15.png|Figure 2]] shows this relationship. | When a reservoir has formed in a trap and has come to pressure equilibrium with the water in the aquifer, the pore pressure of the hydrocarbons at different depths in the reservoir plot along a steeper gradient than the water gradient. [[:file:predicting-reservoir-system-quality-and-performance_fig9-15.png|Figure 2]] shows this relationship. |