A number of basic dynamic processes related to the propagation of hydraulic fractures modify the effective stress in rocks and, therefore, they are relevant for the triggering of microseismic events. For instance, these are the creation of the new fracture volume, the loss of the fracturing fluid and its infiltration into the circumjacent reservoir rocks as well as diffusion of the injection pressure into the pore space of surrounding rocks and inside the fracture. Using real microseismic data, we show that some of these processes can be seen from attributes of the spatio-temporal distribution of the induced microseismicity. Especially, the initial stage of the fracture volume opening just as the back front of the induced seismicity starting to propagate after the termination of the fluid injection can be well identified and used for reservoir engineering.

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