Induced Seismicity and EGS

1
Induced Seismicity and EGS

• Over all Goal
• Provide information to improve the overall
  understanding of the relation between enhancing
  geothermal systems (reservoir manipulation) and
  seismicity.
• Understand characteristics of seismicity
• Magnitude distribution (space and time) of
  seismicity
• Is it possible to mitigate and optimize
  production and injection activities at the same
  time?
• Does the reservoir reach equilibrium?
• Hazard ( to local communities and facilities)
• What are critical to controlling/estimating
  seismic activity during EGS activities?
• What is the minimum knowledge we need to
  determine how EGS (injection and production)
  affect seismic activity?
• Stress distribution
• Geologic conditions/history
• Historical seismicity
• Reservoir pressure and temperatures
• Geochemistry
• Rate/pressure/volume of injection
• Spatial and temporal distribution of wells
• Etc.

2
Induced Seismicity and EGS

• What measurements and data are needed and for how
  long?
• Seismic
• Surface versus borehole
• Single versus multi-component
• Bandwidth and dynamic range ( Remote sensing/tilt
  to AE?)
• Spatial and temporal coverage
• Reservoir
• Pressure, temperature
• Stress
• Geochemistry
• Fluid state
• Local ground response
• Geologic
• Faults/fracture
• Lithology
• Other
• Gravity
• EM/Resistivity
• Etc

3
Induced Seismicity and EGS

• What data and results exist?- What can we learn
  from other similar situations? - Path forward.
• Existing data sets
• Seismicity
• Reservoir/geologic
• Production
• Case histories
• Experience with communities
• Non geothermal but similar
• Oil and Gas
• Fluid disposal
• Dam impoundment
• Excavation/Blast
• Earthquake Hazard Program
• Current and future monitoring
• Etc.