The crosspiot in [[:file:migration-of-petroleum_fig7-10.png|Figure 1]] shows the difference in relative permeability at varying water saturations for bed-parallel vs. bed-perpendicular muliphase fluid flow in a wavy bedded rock. The water saturations need to be much lower in bed-perpendicular flow to achieve the same relative permeability. The flow within a bed is a function of the proportions of end-member lithologies, their permeability and [[capillary pressure]]s, and the orientation of the beds to the direction of the flow. | The crosspiot in [[:file:migration-of-petroleum_fig7-10.png|Figure 1]] shows the difference in relative permeability at varying water saturations for bed-parallel vs. bed-perpendicular muliphase fluid flow in a wavy bedded rock. The water saturations need to be much lower in bed-perpendicular flow to achieve the same relative permeability. The flow within a bed is a function of the proportions of end-member lithologies, their permeability and [[capillary pressure]]s, and the orientation of the beds to the direction of the flow. |