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Article
Open AccessReactivation of variably sealed joints and permeability enhancement in geothermal reservoir rocks
Hydraulic stimulation of enhanced deep geothermal reservoirs commonly targets pre-existing joint networks with the goal of increasing reservoir permeability. Here, we study the permeability and strength of joi...
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Article
Open AccessSynchronization of small-scale seismic clusters reveals large-scale plate deformation
It has long been observed that periods of intense seismic activity in a region alternate with periods of relative quiescence, but establishing whether or not this intermittency is driven by broad-scale physica...
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Article
Hydraulic Diffusivity of a Partially Open Rough Fracture
We investigate the impact of closing a fracture with rough surfaces on the fracture hydraulic diffusivity, which controls the spatiotemporal evolution of pore-pressure perturbations in geological formations, p...
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Article
Open AccessPermeability Evolution During Shear Zone Initiation in Low-Porosity Rocks
Using an innovative experimental set-up (Punch-Through Shear test), we initiated a shear zone (microfault) in Flechtingen sandstone and Odenwald granite under in situ reservoir conditions while monitoring perm...
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Article
Open AccessTHM modeling of gravity anomalies related to deep hydrothermal circulation at Soultz-sous-Forêts (France)
Gravity measurements in the Upper Rhine Graben evidence spatial variations at the regional scale and close to the geothermal sites. They are classically interpreted as linked to the geology. We aim to bring ne...
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Article
Open AccessAuthor Correction: An open data infrastructure for the study of anthropogenic hazards linked to georesource exploitation
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Article
Open AccessAn open data infrastructure for the study of anthropogenic hazards linked to georesource exploitation
Mining, water-reservoir impoundment, underground gas storage, geothermal energy exploitation and hydrocarbon extraction have the potential to cause rock deformation and earthquakes, which may be hazardous for ...
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Article
A Stochastic Study of Flow Anisotropy and Channelling in Open Rough Fractures
The quantification of fluid flow in rough fractures is of high interest for reservoir engineering, especially for deep geothermal applications. Herein, rough self-affine fractures are stochastically generated ...
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Article
Open AccessTHM modeling of hydrothermal circulation at Rittershoffen geothermal site, France
The Rittershoffen deep geothermal project located 6 km east from Soultz-sous-Forts EGS site (France) includes a doublet GRT-1 and GRT-2 to exploit the geothermal resource at the sediments–granite transition wh...
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Article
Open AccessCoda wave interferometry during the heating of deep geothermal reservoir rocks
Coda wave interferometry (CWI) is a high-resolution technique that aims at tracking small changes in a diffusive medium from the time correlation of seismic waveforms. CWI has been widely used in recent years ...
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Article
A self-affine geometrical model of dynamic RT-PMMA fractures: implications for fracture energy measurements
Profilometric imaging of fracture surfaces of rubber toughened polymer has been performed at two different resolutions (a) at large scales [10 ...
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Article
Open AccessHow do permeable fractures in the Triassic sediments of Northern Alsace characterize the top of hydrothermal convective cells? Evidence from Soultz geothermal boreholes (France)
The thermal regime of the Upper Rhine Graben (URG) is characterized by a series of anomalies near Soultz-sous-Forêts (France), Rittershoffen (France), and Landau (Germany). These temperature anomalies are asso...
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Article
Open AccessCharacterization of ambient seismic noise near a deep geothermal reservoir and implications for interferometric methods: a case study in northern Alsace, France
Ambient noise correlation techniques are of growing interest for imaging and monitoring deep geothermal reservoirs. They are simple to implement and can be performed continuously to follow the evolution of th...
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Article
Open AccessUplift around the geothermal power plant of Landau (Germany) as observed by InSAR monitoring
Several centimetres of uplift were observed extending over a square-kilometre area around the geothermal site of Landau, Germany.
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Article
Open AccessMechanical origin of b-value changes during stimulation of deep geothermal reservoirs
The distribution of induced-earthquake magnitudes in deep geothermal reservoirs is a classical tool for monitoring reservoirs. It typically shows some important fluctuations through time and space. Despite bei...
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Article
Open AccessTwo-dimensional THM modelling of the large scale natural hydrothermal circulation at Soultz-sous-Forêts
A two-dimensional numerical model is developed for the Soultz-sous-Forêts reservoir from an idealized cross-section containing six homogeneous horizontal layers. The considered constitutive equations are those...
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Article
Open AccessInduced seismicity in EGS reservoir: the creep route
Observations in enhanced geothermal system (EGS) reservoirs of induced seismicity and slow aseismic slip ruptures on related faults suggest a close link between the two phenomena.
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Article
The long precursory phase of most large interplate earthquakes
Foreshocks precede some—but not all—earthquakes. Analysis of all earthquakes larger than magnitude 6.5 that occurred between 1999 and 2011 shows that earthquakes at plate boundaries are often preceded by incre...
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Performance of Image Correlation Techniques for Landslide Displacement Monitoring
The objective of this work is to present the applicability of image correlation techniques (applied to very-high resolution terrestrial optical photographs and to very dense Terrestrial Laser Scanning (TLS) po...
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Characterization of Fault Roughness at Various Scales: Implications of Three-Dimensional High Resolution Topography Measurements
Accurate description of the topography of active fault surfaces represents an important geophysical issue because this topography is strongly related to the stress distribution along fault planes, and therefor...
