Microbially Induced Calcium Carbonate Plugging for Enhanced Oil Recovery

Figure 7

Distribution of CaCO₃ within pore space of 60/80 mesh Ottawa sand with biotreated 4, 6, and 8 cycles.

(a) 4 cycles of microbial treatment

(b) 6 cycles of microbial treatment

(c) 8 cycles of microbial treatment