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6 Conclusions

[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.