Field Scale Dispersion in Porous Media

Amin Sharifi
field scale

Dispersion in field-scale is a function of grid block size, contaminant source size, time, spatial variability of conductivity field, pore scale dispersivity and velocity of the fluid. By knowing the values of these parameters, expected block effective dispersion coefficient and its variance, the presented model can be capable of accounting subgrid heterogeneity. The model is steady state flow in 3-D system and flow is uniform-in-the-average, and slug has been released instantaneously with high Peclet number. Results show that at early time due to the size of the slug and the characteristic length of the variability uncertainty in the macro-dispersion coefficient are high, and in numerical simulators the size of the block will affect the macro-dispersion coefficient.