Final Report: Mapping Fracture Network Creation with Microseismicity During EGS Demonstrations
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Effective enhanced geothermal system (EGS) sites require optimal fracture networks for efficient heat transfer between hot rock and fluids. Microseismic mapping is a key tool used to infer the subsurface fracture geometry and is widely used in the petroleum industry to monitor fracture propagation during hydraulic stimulations. Traditional earthquake detection techniques (e.g. STA/LTA detectors) and location techniques are often employed to identify microearthquakes in geothermal regions. However, most commonly used algorithms may miss events if the seismic signal of an earthquake is small relative to the background noise level or if a microearthquake occurs within the coda of a larger event. Consequently, we have developed a set of algorithms that provide improved microearthquake detection even in difficult signal processing environments.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1438633
- Report Number(s):
- LLNL-TR--653518
- Country of Publication:
- United States
- Language:
- English
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