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This makes the study of reactive phenomena at the pore-scale particularly relevant. Fluid-mineral interactions occur inherently at the pore (micron) scale, and the representation of pore-scale heterogeneities in effective (averaged) models is not straightforward. There is a strong coupling between flow and reaction, not directly described in terms of an ideal reactor or equilibrium models. The flow of reactive fluids through geologic reservoirs is a complex phenomenon that occurs over a wide range of spatial and temporal scales. In most cases, at the pore-scale, dissolution preferentially enlarges fast-flow channels which greatly restricts the effective surface available for reaction. Furthermore, we provide new insights for the dissolution regime that would be traditionally characterized as uniform. The most heterogeneous rock may exhibit a decrease of up to two orders of magnitude in the sample-averaged reaction rates in comparison with the batch rate. The average dissolution rates depend on both the heterogeneity of the sample and on the flow rate.
#OOLITE GROWTH RATE DIAGRAM SERIES#
The impact of the flow heterogeneity on reactive transport is illustrated in a series of simulations performed at different flow rates. Mineral dissolution is defined in terms of the particle flux through the pore-solid interface, which can be related analytically to the batch (intrinsic) reaction rate. Particle advection is performed with a semianalytical streamline method and diffusion is simulated via a random walk. Reactive transport is simulated with a hybrid approach that combines a Lagrangian method for transport and reaction with the Eulerian flow field obtained by solving the incompressible Navier-Stokes equations directly on the voxels of three-dimensional images. Simulations are performed with a particle tracking approach on images of three porous rocks of increasing pore-space complexity: a bead pack, a Ketton oolite, and an Estaillades limestone. The representation of the pore space is obtained directly from micro-CT images with a resolution of a few microns. Updated MaBug fixes.We study the influence of the pore-space geometry on sample-averaged dissolution rates in millimeter-scale carbonate samples undergoing reaction-controlled mineral dissolution upon the injection of a Updated MaNow supports saving search queries from PubMed and Google Scholar to My Folders! Look for the DeepDyve button next to your search results to add an article to a folder youĪs always, find the articles that are available to read on DeepDyve by looking for the orange 'available' Updated ApYou can now keep track of any article you find in PubMed or Google Scholar in Updated ApUse DeepDyve to automatically keep track of what documents were interesting during your searches on PubMedĪnd Google Scholar! Find your combined document viewing history in the updated Updated Bug fixes and performance improvements. Updated See your Recent Activity directly from the popup!Īlso included: various bug fixes and improvements for automatically saving Recent Activity. Updated Updating popup to properly display Science Direct searches and articles in your Recent Activity Updated Adding support for Science Direct searches and articles in your Recent Activity Updated Bug fixes and minor improvements to metadata collection for Recent Activity.