《Table 4 Experimental results in different scenarios performed with fractured models》

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《Viscous fingering and its effect on areal sweep efficiency during waterflooding: an experimental study》

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As it was mentioned earlier，two experiments were performed with a fractured model.The perpendicular fracture acted such as a distributor，which led to higher displacement efficiency.When water exited from the perpendicular fracture，several parallel short fingers formed which would improve the areal sweep efficiency.The parallel fracture acted in order to join fingers.In this circumstance，a single finger was formed and a considerable area of the model remained unswept.This led to poor sweep efficiency.More unswept region remained in the model if the perpendicular fracture was not located behind the parallel one.In the second water flooding which water first entered the parallel fracture，lower sweep efficiency and earlier breakthrough were observed at the same injection volume compared with other case as can be seen from Fig.14 and Table 4.The onset and growth of fingers in the presence of fractures are also shown in Figs.15a–d and 16a–d.