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Media type:
E-Book;
Thesis
Title:
Imaging and modeling of hydraulic fractures in crystalline rock via induced seismic activity
Other titles:
Übersetzung des Haupttitels: Charakterisierung und Modellierung hydraulischer Brüche in Kristallingestein mit Hilfe induzierter Seismizität
University thesis:
Dissertation, Universität Potsdam, 2022
Footnote:
Kumulative Dissertation
Description:
Enhanced geothermal systems (EGS) are considered a cornerstone of future sustainable energy production. In such systems, high-pressure fluid injections break the rock to provide pathways for water to circulate in and heat up. This approach inherently induces small seismic events that, in rare cases, are felt or can even cause damage. Controlling and reducing the seismic impact of EGS is crucial for a broader public acceptance. To evaluate the applicability of hydraulic fracturing (HF) in EGS and to improve the understanding of fracturing processes and the hydromechanical relation to induced seismicity, six in-situ, meter-scale HF experiments with different injection schemes were performed under controlled conditions in crystalline rock in a depth of 410 m at the Äspö Hard Rock Laboratory (Sweden). I developed a semi-automated, full-waveform-based detection, classification, and location workflow to extract and characterize the acoustic emission (AE) activity from the continuous recordings of 11 piezoelectric AE sensors. Based on the resulting catalog of 20,000 AEs, with rupture sizes of cm to dm, I mapped and characterized the fracture growth in great detail. [...]