Abstract
We study miscible fluid displacement in heterogeneous porousmedia, in the presence of gravity, where the heterogeneity consists of multiple layers. Miscible fluids of different density and viscosity contrasts are used, such that the displacementis hydrodynamically stable. Depending on the values of the control parameters, the overall fluid displacement exhibits either an enhancement of the effect of heterogeneity or a damping. For a sufficiently large viscosity and/or density contrast, the effectof heterogeneity is overcome and the multi-layer system behaves as a single homogeneous layer. We determine experimentally an associated phasediagram and compare our data to a theoretical model valid for systemsof large aspect ratio.
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