Enhanced Geothermal System Monitoring and Induced Seismicity Management
See How Your EGS Reservoir Develops in Real-Time
MicroThermal Energy® combines surface-based passive seismic monitoring, real-time microseismic analysis, and advanced fracture diagnostics to help enhanced geothermal system (EGS) operators map reservoir growth, evaluate injection-to-production well connectivity, and make better-informed stimulation decisions.
From baseline monitoring through stimulation, circulation testing, and long-term operations, MicroThermal Energy delivers the subsurface intelligence needed to improve reservoir performance while supporting induced seismicity risk management.
- Enhanced geothermal systems must create and maintain a connected, conductive fracture network between injection and production wells. Without real-time subsurface monitoring, operators may not know whether stimulation is improving reservoir connectivity, activating unwanted faults, or creating ineffective fracture growth.
- EGS reservoirs can involve extreme temperatures, high pressures, corrosive fluids, and complex crystalline or sedimentary geology. These conditions can limit conventional downhole monitoring equipment and make fracture behavior difficult to predict.
- Fluid injection and stimulation can generate microseismic events. Although these events provide valuable information about fracture development and reservoir response, they must also be continuously monitored to identify fault activation, evaluate seismic risk, and support operational decision-making.
- Real-Time Induced Seismicity Monitoring: Detect, locate, and characterize microseismic events before, during, and after stimulation. Track event magnitude, frequency, location, and migration to support seismic-risk management and site-specific traffic light systems.
- Surface-Based Monitoring for Extreme Environments: Customized dense surface arrays monitor deep geothermal reservoirs without exposing the primary monitoring system to extreme downhole temperatures and corrosive fluids.
- High-Resolution Fracture Mapping: Map fracture length, height, azimuth, stimulated reservoir volume, and discrete fracture networks to understand how the engineered geothermal reservoir is developing.
- Injection-to-Production Well Connectivity: Evaluate whether stimulation is creating effective hydraulic communication and sufficient heat-exchange area between injection and production wells.
- Fault and Structural Hazard Detection: Identify fault activation, fracture reactivation, strike-slip or dip-slip movement, and other structural responses that may affect reservoir integrity or seismic risk.
- Data-Driven Stimulation Optimization: Use real-time subsurface intelligence to improve well spacing, stage spacing, treatment sequencing, pump rates, proppant or diverter strategies, and future completion designs.
- Long-Term Reservoir Surveillance: Monitor reservoir evolution, delayed seismicity, pressure-driven changes, and fracture-network behavior throughout the operational life of the EGS project.
THE MOST TRUSTED NAME IN GEOTHERMAL INDUCED SEISMICiTY MONITORING
Ensure Maximum Energy Output
EGS is all about stimulating the rock to get the optimal, long-term connectivity and drainage which comes from fractures filled with proppant.
Above, the total fracture volume derived from conventional microseismic analysis suggests that this pair of wells is connected.
However, MicroThermal Energy analysis of the actual propped fracture volume reveals that effective connectivity has not been achieved. These advanced insights can inform future completion designs to improve well connectivity and maximize heat exchange.
Build a Productive, Connected EGS Reservoir
Enhanced geothermal systems create or improve permeability in hot, low permeability rock, forming an engineered subsurface heat exchanger. Project success depends on more than generating fractures.
- Operators must establish a connected and conductive fracture network that supports fluid circulation, heat exchange, injectivity, and sustainable energy production.
- Horizontal drilling, multistage stimulation, completions engineering, and geomechanics developed by the oil and gas industry are accelerating next-generation geothermal development.
- Geothermal reservoirs add variables that conventional completions programs do not account for:
- Extreme temperatures
- Varied rock types
- Long-term fluid circulation
- Reservoir integrity
- Induced seismicity
- MicroThermal Energy adapts proven passive seismic and completion-monitoring expertise specifically for geothermal reservoir development.
Real-Time Microseismic Monitoring for EGS
Customized surface seismic arrays allow operators to monitor the reservoir without exposing the primary monitoring system to extreme downhole temperatures and corrosive geothermal fluids. Depending on project objectives and site conditions, MicroThermal Energy can help operators do the following.
- Detect, locate, and characterize microseismic events
- Map fracture growth, height, length, azimuth, and stimulated reservoir volume
- Develop high-resolution discrete fracture network (DFN) models
- Track seismic event rate, magnitude, spatial migration, and cumulative seismic response
- Identify fault activation, fracture reactivation, and changes in reservoir behavior
- Evaluate injection and production well connectivity
- Analyze focal mechanisms, moment tensors, and the subsurface stress field
- Monitor stimulation performance in real time
- Improve future well placement, stage spacing, stimulation sequencing, and injection strategy
Induced Seismicity Monitoring: Understand the Signal and Manage the Risk
Microseismicity is an important indicator of how an EGS reservoir is responding to fluid injection and stimulation. Small seismic events can reveal fracture activation, pressure migration, reservoir growth, and changes in permeability. But changes in event magnitude, frequency, location, or mechanism may also indicate fault reactivation or an evolving seismic hazard. The objective is not simply to count seismic events. It is to understand where they occur, why they occur, how they relate to operations, and what they reveal about reservoir performance and seismic risk.
A fit-for-purpose program starts before the first injection and continues well past the last one.
- Pre-stimulation baseline seismic monitoring
- Continuous monitoring before, during, and after injection
- Long-term surveillance of reservoir and seismic behavior
- Real-time event detection and location
- Magnitude and source-mechanism characterization
- Fault mapping and structural hazard identification
- Data to support site-specific traffic light systems
- Operational alerts and decision support
- Information for regulatory reporting and stakeholder communication
Total Fracture Volume Is Not the Same as Effective Connectivity
A conventional microseismic event cloud may suggest that injection and production wells are connected. But total stimulated fracture volume does not always represent the conductive, hydraulically effective, or propped portion of the fracture network. MicroThermal Energy provides advanced analysis that helps operators evaluate effective fracture geometry and determine whether the created reservoir is likely to support the required fluid circulation and heat-exchange area.
- Injection and production well spacing
- Stage spacing and treatment sequencing
- Pump rate and fluid design
- Proppant or diverter strategy, where applicable
- Reservoir contact and thermal sweep
- Fault avoidance and reservoir containment
- Pump rate and fluid design
- Proppant or diverter strategy, where applicable
Monitoring Across the EGS Lifecycle
Effective monitoring is not a single event. Each phase of an EGS project asks a different question of the subsurface, and the array, the processing, and the objectives should reflect that.
- Establish background seismicity, characterize faults and natural fractures, design the monitoring array, and define project-specific detection objectives.
- Monitor fracture development, seismic response, event migration, fault activation, and reservoir connectivity in real time.
- Evaluate the created fracture network, circulation performance, delayed seismicity, reservoir evolution, and long-term operational behavior.
- Establish background seismicity, characterize faults and natural fractures, design the monitoring array, and define project-specific detection objectives.
Subsurface Intelligence for Next-Generation Geothermal
MicroSeismic brings decades of passive seismic monitoring, real-time processing, geomechanics, and completions expertise from the oil and gas industry to enhanced geothermal systems. MicroThermal Energy helps operators see beyond the event cloud, turning seismic data into actionable insights for reservoir stimulation, induced seismicity management, and long-term geothermal performance.
Plan Your EGS Monitoring Program
Engage MicroSeismic early to establish baseline conditions, design the appropriate seismic monitoring network, define real-time objectives, and integrate monitoring into your stimulation and operational plans.
