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Induced Seismicity and Detailed Fracture Mapping as Tools for Evaluating HDR Reservoir Volume

Author

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  • Elżbieta Węglińska

    (Department of Geoinformatics and Applied Computer Science, Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, 30-059 Kraków, Poland)

  • Andrzej Leśniak

    (Department of Geoinformatics and Applied Computer Science, Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, 30-059 Kraków, Poland)

Abstract

The main goal of this paper was to estimate the heat exchange rock mass volume of a hot dry rock (HDR) geothermal reservoir based on microseismicity location. There are two types of recorded microseismicity: induced by flowing fluid (wet microseismicity) and induced by stress mechanisms (dry microseismicity). In this paper, an attempt was made to extract events associated with the injected fluid flow. The authors rejected dry microseismic events with no hydraulic connection with the stimulated fracture network so as to avoid overestimating the reservoir volume. The proposed algorithm, which includes the collapsing method, automatic cluster detection, and spatiotemporal cluster evolution from the injection well, was applied to the microseismic dataset recorded during stimulation of the Soultz-sous-Forets HDR field in September 1993. The stimulated reservoir volume obtained from wet seismicity using convex hulls is approximately five times smaller than the volume obtained from the primary cloud of located events.

Suggested Citation

  • Elżbieta Węglińska & Andrzej Leśniak, 2021. "Induced Seismicity and Detailed Fracture Mapping as Tools for Evaluating HDR Reservoir Volume," Energies, MDPI, vol. 14(9), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2593-:d:547744
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    References listed on IDEAS

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    1. Andrzej Leśniak & Elżbieta Śledź & Katarzyna Mirek, 2020. "Detailed Recognition of Seismogenic Structures Activated during Underground Coal Mining: A Case Study from Bobrek Mine, Poland," Energies, MDPI, vol. 13(18), pages 1-16, September.
    2. Gaucher, Emmanuel & Schoenball, Martin & Heidbach, Oliver & Zang, Arno & Fokker, Peter A. & van Wees, Jan-Diederik & Kohl, Thomas, 2015. "Induced seismicity in geothermal reservoirs: A review of forecasting approaches," Renewable and Sustainable Energy Reviews, Elsevier, vol. 52(C), pages 1473-1490.
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