Hybrid gravimetry monitoring of Soultz-sous-Forêts and Rittershoffen geothermal sites (Alsace, France)

THM modeling of gravity anomalies related to deep hydrothermal circulation at Soultz-sous-Forêts (France)

“…The largest temperature anomaly at Soultz corresponds to the largest Bouguer anomaly. Time-lapse relative microgravimetry and absolute gravimetry measurements have been performed since 2014 in order to study the mass redistribution in the Soultz and Rittershoffen reservoirs during their industrial exploitations (Hinderer et al 2015;Hector and Hinderer 2016;Portier et al 2018). This hybrid gravimetry monitoring reveals a temporal and spatial correlation between the fluid exploitation and the gravity change of the order of − 31.0 ± 9.0 µGal near the injection area.…”

“…The Mogi's sphere has been first introduced in the works of Mogi (1958) to study the link between the ground deformations and volcanic eruption and can be applied in a geothermal context (Heimlich 2017;Portier et al 2018). Figure 12 illustrates the conceptual model of the buried Mogi's sphere.…”

“…However, other contributions such as the hydrothermal circulation have been investigated to explain the origin of the spatial gravity changes in the URG. These recent studies include hybrid gravimetric surveys (Portier et al 2018) or reinterpretations of the current potential method database (Baillieux et al 2014;Abdelfettah et al 2018). Location of the URG is shown in the subfigure on the top left.…”

Feasibility to Use Continuous Magnetotelluric Observations for Monitoring Hydrothermal Activity. Numerical Modeling Applied to Campi Flegrei Volcanic System (Southern Italy)

“…In the last few decades, several monitoring techniques based on geochemical and/or geophysical methods have been proposed and successfully applied (e.g., Berrino et al, 1984;Lowenstern et al, 2006;Hurwitz et al, 2007;Chiodini et al, 2010;Biggs et al, 2014;Portier et al, 2018). Among these, the most commonly used involve geochemical analyses of the fluids emitted from the surface and ground deformation studies.…”

New results on the gravity monitoring (2014–2017) of Soultz-sous-Forêts and Rittershoffen geothermal sites (France)

“…Then, yearly repetitions have been performed since 2014 for Soultz-sous-Forêts area and since 2015 for Rittershoffen area including the start of geothermal production in 2016 at both plants. Initial results were shown by Portier et al (2018) focusing on the stability of the reference station and the estimate of vertical deformation with continuous GNSS. We extend here this study by presenting the full gravity monitoring from 2014 to 2017 for the Soultz-sous-Forêts and Rittershoffen geothermal sites taking into account the vertical deformation by repeated geodetic leveling.…”