Impact of hydro-chemical conditions on structural and hydro-mechanical properties of chalk samples during dissolution experiments

The importance of karst reservoirs for water resources, and their complexity in terms structural properties hydraulic responses, require a better understanding the formation location conduits these systems, particular chalk reservoirs. For this purpose, we conduct laboratory experiments acid solutions injection core samples using homemade experimental device. Three different flow rates two concentrations are applied on six at atmospheric conditions with Peclet numbers ranging from 0.1 to 1.7 Damköhler 10?6 10?3. Hydraulic chemical measurements carried out during experiments, while petrophysical characterization is conducted before after reactive percolation experiments. analysis data shows an increase permeability rock due calcite dissolution, which associated creation preferential conduits. We also observe that initial control dissolution regime following main conclusions. homogeneous overall rate time directly linked considered injected concentration. heterogeneous (i) pre-existing large-scale heterogeneities newly created paths reducing value rate, (ii) micro-scale result highly general structures, responsible channels applying low numbers.