Following the path of least capillary resistance, nonwetting fluids (gas or nonwetting oil) first move into the pore system that has the largest pore throats. Later, as the 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 throats. Later, as the 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). |