Comparison of several two-dimensional horizontal permeability field K_x(x, z) realizations (approximately log-normal distributed) with constant mean 〈K_x〉 = 100 mD and standard deviation , 50, 100, 150, 200, 250 mD, or equivalently, Dykstra-Parsons coefficient V_DP =0.22, 0.37, 0.57, 0.66, 0.72, 0.75. Typical layers thickness is driven by and close to the correlation length L_z = 5 m.