Reducing anthropogenic CO2 emissions is one of the greatest goals of the present and future environmental scientists. Carbon capture and sequestration is considered to be an efficient technology in eliminating carbon-dioxide at large, stationary carbon-emitting industrial sources. To ensure the long term stability of the geologically trapped CO2, behavior of the CO2-reservoir-porewater system should be predictable on geological timescales. Natural CO2 reservoirs are very important in studying the safety of geological storage of industrial CO2. In these natural occurrences we can study long term rock-fluid reactions, which cannot be reproduced in laboratories or with computer models. Nevertheless, this information is essential to assure the long term safety of CCS-technology. The Mihályi-Répcelak area (Western Hungary) is the oldest known and produced CO2 occurrence in Hungary. In this area there are dozens of CO2 sites that are suitable for industrial production. As a consequence many of the data are publicly available. Using these information we can build a comprehensive picture about the composition of the fluid system, which is essential to understand the interactions within the given rock-fluid system.


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