Fig. 9

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Flow pattern of low flow rate (0.5 cc/h) (a) after 1 PV deionized water flooding (b) after 0.16 PV of blue colored Na2CO3 brine injection; (c) after 0.5 PV of blue colored Na2CO3 brine injection; (d) after 1.25 PV of blue colored Na2CO3 brine injection.