Monitoring a 120-kg CO2 injection in a coal seam with continuous gas and microseismic measurements (European RFCS CARBOLAB research project)

Abstract : INERIS has monitored a CO2 injection test performed in a coal seam. Both passive seismic monitoring and gas monitoring have been performed prior, during and after the injection test. Gas migration was not monitored in coal because leakage occurred during the injection. Nevertheless, passive seismic monitoring and continuous gas monitoring proved here to be valuable tools to observe gas migration and the behaviour of the rock during the injection test. They also helped to understand the discrepancies between observations and predictions, which can be useful to draw recommendations for future tests.