− | The pores and fluids of a reservoir system interact during the processes of expulsion, [[migration]], accumulation, and flow to a wellbore. Differential pressure (ΔP) in the fluid continuum of the [[petroleum system]], caused by properties of fluids and pores, controls these processes. | + | The pores and fluids of a reservoir system interact during the processes of expulsion, [[migration]], [[accumulation]], and flow to a wellbore. Differential pressure (ΔP) in the fluid continuum of the [[petroleum system]], caused by properties of fluids and pores, controls these processes. |