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Laboratory studies have been performed to evaluate the impact of acid gas (80% H2S, 20% CO2) and<br>CO2 injection on the carbonate matrix properties at reservoir conditions. Injectivity abnormalities have<br>been reported in the literature in several WAG projects involving CO2 and loss of injectivity has been<br>crucial factor in many of these projects. However, literature data shows that some reservoirs loose<br>injectivity and others increase injectivity after the first CO2 slug is injected. Change in rock properties<br>due to fluid/rock interaction can account for some of the injectivity loss.