Short-term effects of impurities in the CO2 stream injected into fractured carbonates

As main conclusions from laboratory scale results, a porosity diminution was measured after the injection of CO2 with 5%v of SO2; apart from that, without SO2, the effluent pH was in the range of 7-8 whereas in case of CO2 and SO2, a pH of 1-2 was obtained. Otherwise and focused on field scale tests, a density decrease was detected comparing the base case (pure CO2) with the CO2 injection containing 5.1%v of synthetic air. On the other hand, Ca2+, SO42−, Mg2+ and K+ migration effects in the rock were also detected and analyzed.