[681.1.16.1] In summary, we presented a comparison of experimental
observations with theoretical predictions for a theory
of twophase flow in porous media based on the hydraulic
differences between percolating and non-percolating fluid parts.
[681.1.16.2] It was shown that taking into account these differences renders the
modeling of a multistep outflow capillary pressure saturation relation
measurement possible with one single set of parameters.
[681.1.16.3] In contrast to most of the hysteretic extension of the standard theory for two-phase
flow in porous media, the underlying theory has a physical foundation.
[681.1.16.4] We therefore conclude that percolation of fluid phases
may be the physical reason for hysteresis between drainage and
imbibition during immiscible displacement.
