A5087797723- Seismic Imaging and Inversion Techniques
- Drilling and Well Engineering
- Hydraulic Fracturing and Reservoir Analysis
- Nuclear Physics and Applications
- Rock Mechanics and Modeling
- Hydrocarbon exploration and reservoir analysis
- NMR spectroscopy and applications
- Geophysical Methods and Applications
- Seismic Waves and Analysis
- Tunneling and Rock Mechanics
- High-pressure geophysics and materials
- Geotechnical and Geomechanical Engineering
- Grouting, Rheology, and Soil Mechanics
- Seismology and Earthquake Studies
- Geological and Geochemical Analysis
- earthquake and tectonic studies
- CO2 Sequestration and Geologic Interactions
- Enhanced Oil Recovery Techniques
- Geological Modeling and Analysis
- Geophysical and Geoelectrical Methods
- Atomic and Subatomic Physics Research
- Ultrasonics and Acoustic Wave Propagation
- Earthquake Detection and Analysis
- Powder Metallurgy Techniques and Materials
- Geology and Paleoclimatology Research
Heriot-Watt University
2010-2023
Sols, Solides, Structures, Risques
2009-2021
University of Potsdam
2014
GFZ Helmholtz Centre for Geosciences
2013
Université Grenoble Alpes
2009-2010
Université Joseph Fourier
2010
Centre National de la Recherche Scientifique
2010
Institut polytechnique de Grenoble
2010
We study triggering processes in triaxial compression experiments under a constant displacement rate on sandstone and granite samples using spatially located acoustic emission events their focal mechanisms. present strong evidence that event-event plays an important role the presence of large-scale or macrocopic imperfections, while such is basically absent if no significant imperfections are present. In former case, we recover all established empirical relations aftershock seismicity...
Recent studies have demonstrated that the combination of x-ray tomography during triaxial tests ("in-situ" tests) and 3D- volumetric Digital Image Correlation (3D-DIC) can provide important insight into mechanical behaviour deformation processes granular materials such as sand. The application these tools to investigate mechanisms failure in rocks is also obvious interest. However, relevant applied confining pressures for testing on are higher than those sands therefore stronger pressure...
Seismic moment tensors can provide information on the size and orientation of fractures producing acoustic emissions (AEs) stress conditions in sample. The tensor inversion AEs is, however, a demanding procedure requiring carefully calibrated sensors accurate knowledge velocity model. In field observations, model is usually isotropic time independent. laboratory experiments, often anisotropic dependent attenuation might be significant due to opening or closure microcracks sample during...
Abstract High‐speed neutron tomographies (1‐min acquisition) have been acquired during water invasion into air‐filled samples of both intact and deformed (ex situ) Vosges sandstone. Three‐dimensional volume images processed to detect track the evolution waterfront calculate full‐field measurement its speed advance. The flow process correlates well with known rock properties is especially sensitive distribution altered associated observed localized deformation, which independently...
We performed laboratory experiments on sandstone specimens to study brittle failure and the reactivation of an experimentally produced plane induced by pore-pressure perturbations using constant force control in high compressive stress states. Here, we focus shear a dry sample later fracture due water injection. Acoustic Emission (AE) monitoring has been used during both experiments. also ultrasonic wave velocities monitor pore fluid migration through initially specimen. To characterise AE...
This paper presents the results of experimental compression tests on a 2D granular material composed mixture circular and rectangular rods. Numerical simulations tests, using Discrete Element Method (Molecular Dynamics), successfully reproduce results. The comparison between numerical highlights important role contact laws (especially rolling resistance). A statistical study rotations particles during (experimental numerical) is carried out. such are finally compared to predictions continuum...
Wellbore instability could restrict the efficient development of unconventional petroleum resources in shales as drilling fluids may influence integrity by causing hydration damage. In this work we study impact on shale samples from Xi Feng formations using Nuclear Magnetic Resonance. Samples were saturated distilled water for different durations and then samples’ T2 relaxation time spectrum area analyzed NMR. Damage variable, which can not only interpret damage quantitatively but has also a...
In a CO2 storage site, carbonate rocks might be good reservoir or seals depending on their porosity and permeability. However, these properties may change in time due to deformation processes related injections and/or withdraws. this pilot study, we investigate at the laboratory scale influence of CO2-induced geochemical reactions mechanical integrity rocks. To achieve target, have performed an experimental HP-HT test brine saturated oolitic limestone samples that were exposed 230 bar...
Shear and compaction bands represent two fundamental failure modes in sandstones. The identification of these features both the natural outcrops laboratory scale yields useful insights into mechanisms localised deformation. Several conventional advanced experimental full-field methods have been developed order to shed light processes involved, as well qualify quantify parameters such orientation bands. In this paper, we present results triaxial tests, investigating shear porous sandstone,...