Much of the nation’s strategic approach to energy security in coming decades will involve subsurface engineering in the realms of resource extraction and byproduct storage. This is evident by recent attention in domestic shale gas, carbon capture and storage, and geothermal energy. In addition, the question of future geologic storage of the nation’s nuclear waste is being addressed by the Presidential Blue Ribbon Commission on America’s Nuclear Future. These subsurface endeavors share themes in nonlinearly coupled, far-from-equilibrium thermal, mechanical, hydrological, and chemical dynamics.
To help the nation fulfill energy security goals, we are investigating three related tasks examining coupled deformation and fluid flow in heterogeneous geologic systems that often comprise reservoirs or sealing lithologies for waste and resources. We focus on non-Darcian, low–Reynolds number flows in saturated or unsaturated porous media, applicable to subsurface engineering endeavors for post-closure or post-injection periods of hundreds to thousands to tens of thousands of years.
Deliverables include experimentally validated constitutive laws, innovative computational tools, and related publications and presentations. These deliverables can be used to improve nonlinear modeling schemes that couple single- and multiphase fluid flow and deformation. Such modeling schemes will factor importantly in predictions and performance assessment for subsurface engineering pursuits, as well as in a basic understanding of how fluids interact with and in deforming, porous media.