Seismic Monitoring in the Framework of the Pilot Project CLEAN

The joint research project "CLEAN" (CO2 Largescale EGR in the Altmark Natural-gas field) is a scientific program accompanying the Enhanced Gas Recovery (EGR) project within the Almark Natural gas field. During the period of three years an amount of 100,000t of CO2 will be injected into the reservoir layer. The Injection is accompanied by a large number of biological, chemical and physical monitoring experiments, which are designed to monitor the spatial and temporal evolution of the CO2 front within the reservoir as well as the related processes. The instrument to achieve this aim are active and passive seismic measurements. Therefore a time-lapse VSP/MSP survey as well as the installation of a borehole seismometer network for the monitoring and analysis of potential injection-induced seismicity are planned. In preparation to the VSP/MSP experiments rock physical estimates and simulations of the seismic wavefield were performed in order to get information concerning the implementation. These information are boundary conditions for the survey design as well as the expected ampitude changes and their detectability.