Reservoir Characterisation Based on Seismicity Induced after the End of Fluid Injections

1 A008 RESERVOIR CHARACTERISATION BASED ON SEISMICITY INDUCED AFTER THE END OF FLUID INJECTIONS M. PAROTIDIS 1 S.A. SHAPIRO 1 E. ROTHERT 1 1 Freie Universitaet Berlin Department of Geophysics Malteserstr. 74-100 12249 Berlin Germany Abstract. This study concentrates on events triggered by borehole fluid injections especially after the end of injection. It is assumed that pore-pressure diffusion is the main triggering mechanism. Based on the theory of poroelasticity we derive an equation that describes the distance from injection point where seismicity extinguishes at a given time after the end of fluid injection. We call this distance the back front