On the Transport of Emulsions in Porous

6 Emulsions appear in many subsurface applications including bioremediation, surfactant7 enhanced remediation, and enhanced oil-recovery. Modeling emulsion transport in 8 porous media is particularly challenging because the rheological and physical prop9 erties of emulsions are different from averages of the components. Current modeling 10 approaches are based on filtration theories, which are not suited to adequately ad11 dress the pore-scale permeability fluctuations and reduction of absolute permeabil12 ity that are often encountered during emulsion transport. In this communication, 13 we introduce a Continuous Time Random Walk based alternative approach that 14 captures these unique features of emulsion transport. Calculations based on the 15 proposed approach resulted in excellent match with experimental observations of 16 emulsion breakthrough from the literature. Specifically, the new approach explains 17 the slow late-time tailing behavior that could not be fitted using the standard ap18 proach. The theory presented in this paper also provides an important stepping 19 stone towards a generalized self-consistent modeling of multiphase flow. 20