“…These papers center around the same formulation but do not address the basic issues of miscible displacement in fractured porous media (1-3). Kats et al (1) considered only the effect of gravity on crossflow between the matrix and the fractures in the context of a dual-porosity model. A general model by, Bedrikovetskii, et al (2), Basniev and Bedrikovetskii (3) includes the effect of gravity, diffusion, and convection.…”