Define permeability in a porous media
 

Dear experts,

Hi. I have been trying to define "permeability" in a porous media (3D) but I cannot find any method to define it in the user manual. Data that I have is porosity (7%), pressure (2275 psia), fluids (10% brine and methane) and material (sandstone) in the formation. But I don't know velocity. Plase give me any idea to define it.

Thanks in advance!