EVENT DETAILS
Localized Instabilities and Pattern Formation in Multi-Physics Geomechanics Systems
Abstract
Localization instabilities like shear and compaction bands, cracks, faulting, folding, boudinage, are of primordial importance in the disciplines of earth science and engineering related problems. They relate to catastrophic events like earthquakes and landslides, but are also present in most engineering problems. In energy engineering for example, they constitute natural barriers or conduits for hydrocarbons and energy operations, but also affect the long-term structural performance of the energy reservoirs. As we proceed to unlocking resources at ever increasing depths, at high pressures and temperatures and in the presence of chemically active fluid-rock systems (like carbonates or shales), the assessment of the onset and evolution of localization patterns in such multi-physical environments is an important step towards deeper understanding of these systems. In this work a multi-physical (Thermo-hydro-chemo-mechanical) model is presented and calibrated against laboratory experiments. Following this step, the non-linear bifurcation analysis of the model will be presented, revealing conditions for pattern formation (from cracks to shear-bands to compaction bands) and transition to chaos. Finally, examples in the Geodynamic scale will be given, comprising the evolution and reactivation of faults, the conditions required for folding and boudinage at high temperatures and pressures, compaction bands and diagenetic fracture network formation in unconventional reservoirs, as well as shear instability and weak phase production at high temperature deep boreholes.
Bio
Manolis Veveakis is an Assistant Professor in the Department of Civil and Environmental Engineering, Duke University. He earned a Ph.D. in 2010 from the Department of Mechanics of the National Technical University of Athens, Greece, under the supervision of late Prof. I. Vardoulakis. Before joining Duke University, he was a Senior Lecturer at UNSW's School of Petroleum Engineering since 2014 and a Research Scientist in CSIRO's Division of Earth Sciences and Resource Engineering before that. Veveakis holds a Diploma (BSc+MEng) in Applied Mathematics and Physics (MEng in Materials Engineering), an MSc in Applied Mechanics and a PhD in Geomechanics.
TIME Wednesday October 16, 2019 at 11:00 AM - 12:00 PM
LOCATION A230, Technological Institute map it
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CONTACT Tierney Acott tierney-acott@northwestern.edu
CALENDAR McCormick - Civil and Environmental Engineering