REACTIVE FLOW IN CARBONATE ROCKS FROM LACUSTRINE ENVIRONMENTS: THE EFFECTS OF PRESSURE AND FLUID SALINITY

Abstract

The high production of CO2 from Brazilian pre-salt reservoirs requires research on CO2 interactions with carbonate reservoirs for enhanced oil recovery (EOR) or CO2 trapping. This interaction causes reactive phenomena that are not fully understood. Experimental tests on carbonate facies are crucial for understanding reactions and their impact on reservoir characteristics. This study investigates experimentally reactions generated by reactive fluid flow in carbonate rocks from two geological scenarios by analyzing chemical and morphological parameters before and after the tests. Salinity was the most significant parameter for reactive flow, impacting porosity for modern continental carbonate samples from Patagonia. However, the sample from the Brazilian pre-salt showed higher mineral stability and less mineral dissolution. Results provide data for simulating reactive transport in these rocks for CCS and understanding diagenetic processes' impact on reservoir quality.