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Swiss Geosciences Meeting 2020 -- Zurich -- 7th Nov. 2020

2020-10-04T10:35:55+02:00

Monitoring geothermal field for heat production and storage in the context of the Jura tectonics. N. Houlie N., Martin F., Guglielmetti L., Valley B., Meyer M., Poster Session 8 — 7 Nov. 2020

Geothermal production from deep reservoirs allows delivering energy in the form of heat and/or power to final users. Additionally, one application that is recently emerging is seasonal storage of excess heat from industrial and civil processes into the subsurface such as deep aquifers. Stored heat can then be delivered in high heat demand periods according and has the potentially to contribute decarbonizing the energy system by partially replacing fossil fuels that are commonly used for heat production in winter. The potential of storage of excess heat in deep aquifers in Geneva is under investigation in the framework of the European ERA-Net GEOTHERMICA HEATSTORE project.
Heat production and storage are the main applications that are investigated in the framework of the GEOTHERMIES program developed by the Services Industriels de Geneve (SIG) and the Canton of Geneva. The GEo-1 exploration well is the first deep wells drilled by SIG in the Geneva area, it is 744m deep, produces 50l/s of thermal water at 34˚C with 8-10 bars wellhead pressure. One of the environmental effects associated with geothermal production is ground deformations which usually occurs due to reservoir depletion because of excessive withdrawn of fluid with respect to the recharge. This effect has been observed in several industrial geothermal fields (Bromley et al. 2010, Mossop and Segall,1997) but has never been investigated for heat storage applications where rather frequent production and injection cycles are operated seasonally. The GEo-01 well is providing a great opportunity to assess the effects of fluid extraction from the reservoir as production tests are planned to be performed in the near future. Therefore, to establish the background noise that can and use it to establish a quiet baseline, before production tests, the GEo-01 well has been monitored using a wide range of geophysical instruments and the combination of truly collocated instruments (inclinometer, gravimeter, GPS and seismometer) allowing for the monitoring of ground motion and local vibration. This study presents the results from the data collection over 4 months, for all parameters of the local context at two locations close to GEo-1. The data time series are discussed in the context of regional tectonics.

First images of south Vietnam (2019-2020) are available

2020-04-27T09:32:36+02:00

SAR in Lausanne

2019-12-18T21:35:40+01:00

Inclination records periodograms (15 days)

2018-12-27T18:22:48+01:00

After 15 days of recording, the sensor is well stabilised and the accuracy shows its real potential.

Accurate instrumentation

2018-12-02T16:49:07+01:00

We are excited to show the first record of our high-precision inclinometer. This first time-serie clearly shows the high precision of the sensor and its stability across a complete hour. Next week this sensor will be deployed in a seismic cave in France. More news soon.

Monitoring baseline surface motion

2018-12-02T15:50:54+01:00

Les enjeux de ce rapport sont de définir les possibilités de la technologie InSAR dans le domaine de la surveillance de surface du canton de Genève. Je commence par poser les problèmes qui se posent pour toute surveillance géodésique avant de démontrer les possibilités réelles des outils de surveillance alternatifs tels que le GPS, ou l'inclinometrie.

Géothermie dans le Jura

2018-12-02T15:50:11+01:00

The aim of this study is to evaluate the level of tectonic activity close and in the vicinity of the Haute-Sorne project at the light of the most recent research done in the area. The current understanding of this area is today defined by seismic studies based on seismicity catalogues (earthquakes monitoring, moment tensors), on local geological studies and at last on recent GPS data. As this study focuses on the use of GPS data, I have reinterpreted my study published in Scientific Reports (Houlié et al., 2018) after updating it with GPS data collected since the publication of this seminal paper.