The concept of hydrodynamics and tilted hydrocarbon-water contacts excites passion but remains controversial. It was recognized in the later 1950s that flow through the aquifer was capable of tilting hydrocarbons held in a trap. Subtle traps resulting from hydrodynamic conditions encountered in petroleum basins were described for many years (e.g. Hubbert, 1940, 1953). The aim of this paper is to show, through the example of the Llanos basin (Colombia), how 3D basin modeling can help in determining the hydrodynamic traps and in evaluating the related volumes of hydrocarbon originally in place.


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