•Visual displacement experiments were conducted on the transparent replicas of seven fracture samples.•The effect of surface roughness on relative permeabilities of single fractures was clarified.•Fractures developed from less porous (larger grain) rocks yielded residual saturations in large pockets.•Porous rocks with small grain sizes yielded residual saturations in small pockets.•The initial and residual saturations were correlated to four fractal parameters.
International Journal of Multiphase Flow – Elsevier
Published: Oct 1, 2015
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