A5070394005- Groundwater flow and contamination studies
- Hydraulic Fracturing and Reservoir Analysis
- Geothermal Energy Systems and Applications
- Seismic Imaging and Inversion Techniques
- CO2 Sequestration and Geologic Interactions
- Reservoir Engineering and Simulation Methods
- Soil and Unsaturated Flow
- Geophysical Methods and Applications
- Drilling and Well Engineering
- Flow Measurement and Analysis
- Seismology and Earthquake Studies
- earthquake and tectonic studies
- Geophysical and Geoelectrical Methods
- Water Systems and Optimization
- Groundwater and Isotope Geochemistry
- Hydrocarbon exploration and reservoir analysis
- Seismic Waves and Analysis
- Hydrology and Watershed Management Studies
- Rock Mechanics and Modeling
- Landslides and related hazards
- Grouting, Rheology, and Soil Mechanics
- Enhanced Oil Recovery Techniques
- Atmospheric and Environmental Gas Dynamics
- Advanced Sensor and Control Systems
- Ultrasonics and Acoustic Wave Propagation
Université de Rennes
2011-2024
Géosciences Rennes
2011-2024
Centre National de la Recherche Scientifique
2011-2024
University of Lausanne
2019-2021
ETH Zurich
2015-2018
Geological Institute
2015-2017
Board of the Swiss Federal Institutes of Technology
2016-2017
University of Liège
2014-2015
Abstract. In this contribution, we present a review of scientific research results that address seismo-hydromechanically coupled processes relevant for the development sustainable heat exchanger in low-permeability crystalline rock and introduce design situ Stimulation Circulation (ISC) experiment at Grimsel Test Site dedicated to studying such under controlled conditions. The shows on reservoir stimulation deep geothermal energy exploitation has been largely based laboratory observations,...
We show how fully distributed space‐time measurements with Fiber‐Optic Distributed Temperature Sensing (FO‐DTS) can be used to investigate groundwater flow and heat transport in fractured media. Heat injection experiments are combined temperature along fiber‐optic cables installed boreholes. Thermal dilution tests shown enable detection of cross‐flowing fractures quantification the cross rate. A borehole thermal tracer test is then analyzed identify fracture zones that hydraulic connection...
Abstract In theory, aquifer thermal energy storage (ATES) systems can recover in winter the heat stored during summer to increase efficiency of system. practice, is often lower than expected from simulations due spatial heterogeneity hydraulic properties or non‐favorable hydrogeological conditions. A proper design ATES should therefore consider uncertainty prediction related those parameters. We use a novel framework called Bayesian Evidential Learning (BEL) estimate capacity an alluvial...
Abstract The characterization and modeling of heat transfer in fractured media is particularly challenging as the existence fractures at multiple scales induces highly localized flow patterns. From a theoretical numerical analysis simple conceptual models media, we show that channeling has significant effect on scaling recovery both space time. late time tailing under channeled shown to diverge from behavior expected for classical parallel plate model follow channel modeled tube. This...
Investigations of solute transport in fractured rock aquifers often rely on tracer test data acquired at a limited number observation points. Such do not, by themselves, allow detailed assessments the spreading injected plume. To better understand behavior granitic aquifer, we combine with single-hole ground-penetrating radar (GPR) reflection monitoring data. Five successful tests were performed under various experimental conditions between two boreholes 6 m apart. For each experiment,...
Abstract Multiple meter‐scale hydraulic fracturing (HF) experiments were executed in the crystalline rock at Grimsel Test Site, Switzerland. The effect of HF on transmissivity has been quantified with tests before and after each experiment. We observe enhancement 2 to 3 orders magnitude a change dominant flow regime most tests. From microseismicity induced by HF, we do not systematic correlation between event numbers, frequency‐magnitude distribution, or maximum magnitude. However, radii...
Abstract New in situ measurements to constrain the range, distribution, and spatial (meter‐scale) variations of permeability shallow crustal fault zones are reported based on systematic downhole tests at 0.5‐km depth crystalline rock. Single cross‐hole hydraulic packer were performed a new dedicated test facility hosted Grimsel Test Site, Swiss Alps, following technical instrumentation isolation discrete accessed by an array boreholes. Single‐hole results presented this paper, while...
Heat transport in fractured media concerns various hydrogeology and subsurface engineering applications, such as heat transfer enhanced geothermal systems (EGS), thermal energy storage rocks, or the effect of on rock properties near nuclear waste repositories. The main factors influencing are hydraulic matrix presence magnitude fluid flow, which depends connectivity, geometry, fracture network.This study analyzes coupled flow processes at intersections based numerical simulations laboratory...
Abstract Groundwater is widely exploited, leading to groundwater depletion, and a reduction of river flows. While the impact climate change hydrologic forcings on hydrogeological cycle has long been demonstrated, lack observations subsurface thermal changes scale decades hampering accurate understanding how human activities regimes (i.e., spatiotemporal evolution temperature). In this paper, we analyse new temperature data illustrating complex interplay warming anthropogenically enhanced...
Abstract Cross‐hole fluid injection tests were performed on shallow (0.5 km depth) crustal fault zones to characterize their internal flow structures scales of 3–30 m. The data acquired at the Grimsel Rock Laboratory, Switzerland, after zonal isolation damage in boreholes equipped with multipacker systems. We show that 80% pressure responses detected evolved as a power function time due fracture‐controlled and best described by fractional model dimension ( n ) range [1.3,1.5]. scaling...
Abstract A fundamental assumption in numerous studies of heat transfer porous media is local thermal equilibrium (LTE), which assumes that the temperature at fluid and solid interface instantaneous equilibrium. Although significant efforts have been made to quantify occurrence consequences nonequilibrium (LTNE), where temperatures adjacent phases differ, there no simple expression for quantifying effects disequilibrium. Using a numerical model combining LTE LTNE models, we develop here two...
The accurate characterization of the location, hydraulic properties, and connectivity major fracture zones is essential to model flow solute transport in fractured media. Cross‐borehole flowmeter tests, which consist measuring changes vertical borehole flows when pumping a neighboring borehole, were shown be an efficient technique provide information on properties that connect pairs. interpretation such experiments may, however, quite uncertain multiple connections exist. In this study, we...
Abstract The range of options for investigation hydraulic behavior aquifers from boreholes has been limited to rigid, cumbersome packers, and inflatable sleeves. Here we show how a new temporary borehole sealing technique using soft grains polyacrylamide (PAM) gel as material can be used investigate natural groundwater flow dynamics discuss other possible applications the technology. If no compressive stress is applied, packing, with permeability similar open gravel, suppresses free...
Abstract Temporal changes in groundwater chemistry can reveal information about the evolution of flow path connectivity during crustal deformation. Here, we report transient helium and argon concentration anomalies monitored a series hydraulic reservoir stimulation experiments measured with an situ gas equilibrium membrane inlet mass spectrometer. Geodetic seismic analyses revealed that applied treatments led to formation new fractures (hydraulic fracturing) reactivation natural shearing),...