As regulators introduce operational protocols based on seismic magnitudes occurring during hydraulic fracturing, operation strategies are required to mitigate the seismic hazard. In certain cases, pressure increases associated with the hydraulic fracture injection, can induce slip of tectonically stressed faults leading to triggered seismicity. A coupled hydrogeomechanical model is used here to examine fault activation during multi-stage hydraulic fracturing and to examine operational scenarios. The model shows that the relative stage sequencing relative to the direction of fault slip can significantly impact the fault slip. Changing the viscosity of the fracturing fluid is also explored as an operational mitigation scenario, which is found to have a strong impact on fault slip and associated seismic magnitudes.
Presentation Date: Tuesday, September 26, 2017
Start Time: 11:25 AM
Presentation Type: ORAL