Seismic monitoring of Nature's Heat Geothermal Reservoir in Kwintsheul (Netherlands)

David Naranjo*, Deyan Draganov, Katerina Polychronopoulou, Mathieu De Bas, Cornelis Weemstra

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

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Abstract

In 2018, the geothermal project Nature's Heat started its operations to supply heat to 64 hectares of greenhouses in Kwintsheul, Netherlands. The operation involves the extraction and reinjection of geothermal fluids at a depth of about 2.4km. Several studies suggested that geothermal operations in these parts of The Netherlands are unlikely to generate felt seismic events (M>2.0); nevertheless, adequate seismic monitoring techniques are essential to guarantee sustainable and safe use of the Dutch subsurface. Between July and October 2019, Delft University of Technology, Seismotech (Greece), and Gastreatment Services BV installed a passive seismic network to monitor the seismic activity over Nature's Heat geothermal reservoir. The seismic network consists of 30 three-component short-period seismic sensors placed at inter-station distances of approximately 150 m along two crossing lines. A challenge for seismic monitoring systems in urban areas is the high level of background noise. In Kwintsheul, anthropogenic noise dominates the spectrograms at frequencies higher than 2 Hz. Despite these high background-noise levels, a seismic event of ML = 0.0 (duration magnitude Md 0.16) was recorded by all seismometers of the array on July 14, 2019. To understand the relation of the event and improve the safety of the geothermal operation, we are developing a probabilistic monitoring and inversion scheme. This study aims to improve the seismic network's detection and hypocentre-determination capabilities and verifies via template matching if the detected seismic event is repeating over time (possibly at the background noise level).
Original languageEnglish
Number of pages7
Publication statusPublished - 2022
EventEuropean Geothermal Congress 2022 - Germany, Berlin
Duration: 17 Oct 202221 Oct 2022
https://europeangeothermalcongress.eu/proceedings-egc-2022/

Conference

ConferenceEuropean Geothermal Congress 2022
Abbreviated titleEGC 2022
CityBerlin
Period17/10/2221/10/22
Internet address

Keywords

  • Passive seismology
  • Seismic monitoring
  • Dutch Geothermal Doublet
  • Geothermal Energy

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