Processes Responsible for Localized Deformation within Porous Rocks: Insights from Laboratory Experiments and Numerical Modeling

摘要

The formation of shear-enhanced compaction bands is of interest for various geological reservoir applications such as energy storage, geothermal energy production or enhanced oil recovery. These localized features can indeed have great impacts on the transport properties of reservoir rocks and therefore on the reservoir productivity. In this study, we report experimental and numerical results aiming at identifying and quantifying the processes responsible for localization of deformation and their impacts on porosity evolution. Axial loading experiments in a triaxial setting at three different confining pressures were conducted on Bentheim sandstone with continuous porosity measurements. In a second step, the experimental results were used as constraints for numerical modeling using a Drucker-Prager yield criterion with data-derived hardening and softening rules.