Mapping Diffuse Seismicity for Geothermal Reservoir Management with Matched Field Processing Geothermal Lab Call Project

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Last modified on July 22, 2011.

Project Title Mapping Diffuse Seismicity for Geothermal Reservoir Management with Matched Field Processing
Project Type / Topic 1 Laboratory Call for Submission of Applications for Research, Development and Analysis of Geothermal Technologies
Project Type / Topic 2 Induced Seismicity

Project Description Accurate identification and mapping of the large numbers of micro earthquakes induced in EGS is one technique that provides diagnostic information when determining the location, orientation and length of underground crack systems for use in reservoir development and management applications. Conventional earthquake location techniques often are employed to locate micro earthquakes. However, these techniques require picking individual seismic phase onsets across a network of sensors. This process is labor-intensive and poorly suited to rapid turn-around situations, such as providing feedback during hydraulic fracture operations. Additionally, fluid injection frequently induces a large number of events with overlapping waveforms, which can complicate the picking of phases or completely obscure the onset of smaller signals.
State California
Objectives Detect and locate micro earthquake induced by EGS hydrofracturing and fluid reinjection operations using matched field processing (MFP) to aid in the characterization of reservoir fracture networks.
Awardees (Company / Institution) Lawrence Livermore National Laboratory













Funding Opportunity Announcement DE-PS36-09GO99017

DOE Funding Level (total award amount) $925,000.00

Total Project Cost $925,000.00



Principal Investigator(s) Dennise C. Templeton


Targets / Milestones - Obtain a seismic array data set in a geothermal area, to be used in empirical and model-based MFP.


- Create or obtain an earthquake location catalog of representative events over the study volume for use in master template creation.
- Develop a catalog of master matching templates.
- Perform the match field processing (MFP) technique on a continuous seismic datastream using the previously commuted master templates.
- Model Coulomb stress changes due to an opening crack and match the location modeled stress increases with the location of mapped seismicity.
- Create a catalog of model-based master matching templates from synthetic data.
- Perform the MFP technique on a continuous seismic datastream using the model-based master templates in the same manner as task 4.
- Model Coulomb stress changes due to an opening crack and match the location of modeled stress increases with the location of mapped seismicity using the model-based method.





Location of Project Livermore, CA




Funding Source American Recovery and Reinvestment Act of 2009

References EERE Geothermal Technologies Programs[1]

References

  1. EERE Geothermal Technologies Programs