Numerical Experimental Research of Equivalent Seepage Characteristic for Fractured Porous Media

The influencing factors of effective permeability have been a difficult point in studying seepage characteristic of pore-fissure media. In order to investigate the seepage characteristic for pore-fissure media, considering the coupling of fluid mechanics and seepage mechanics, the numerical experimental was made and solved for Comsol Multiphysics with FEM (finite element). Based on the numerical experimental results, the paper discussed the relationship among the horizontal effective permeability of pore-fissure media, the width and angle of the fracture. The results shown: 1) The velocity in fissures was 10 4 - 10 7 times faster than in pores. The width of the fracture played a leading role in horizontal effective permeability of pore-fissure media; 2) The angle between the fracture and the pressure gradient bigger, the horizontal effective permeabil- ity smaller. The decrease was the most obvious from 40˚ to 45˚; 3) The pressure gradient had little impact on the horizontal effective permeability.