Following the path of least capillary resistance, [[nonwetting fluids]] (gas or nonwetting oil) first move into the pore system that has the largest [[Pore and pore throat sizes|pore throats]]. Later, as the [[Hydrocarbon column|column height]] of the oil or gas grows and the buoyancy pressure increases, the hydrocarbons begin migrating into pores with smaller and smaller pore throats (in a [[water-wet system]]). | Following the path of least capillary resistance, [[nonwetting fluids]] (gas or nonwetting oil) first move into the pore system that has the largest [[Pore and pore throat sizes|pore throats]]. Later, as the [[Hydrocarbon column|column height]] of the oil or gas grows and the buoyancy pressure increases, the hydrocarbons begin migrating into pores with smaller and smaller pore throats (in a [[water-wet system]]). |