3D Pore-network quantitative analysis in deformed carbonate grainstones

This study consists of a three-dimensional (3D) assessment of the pore network in deformed carbonate grainstones cropping out in Sicily and Abruzzo regions (Italy). Previous studies, including microphotography, mercury injection analysis and in-situ air permeameter measurements, have reported permeability differences (in the range of two-to-three orders of magnitude) among these rocks, that cannot be explained only considering the differences of porosity. This study aims to analyze quantitatively the pore network properties (porosity, pore connectivity, specific surface area) of deformed porous carbonates by means of X-ray micro-CT techniques (synchrotron and microfocus-based). Both connected and isolated pore network are investigated for making inferences about their control on permeability. In addition, the effects of diagenesis and deformation on the pore network properties are also illustrated. The variability of the results and the existence of REV were evaluated. Finally, the capability of the X-ray micro-CT for obtaining the main textural and hydraulic properties in deformed porous carbonates was demonstrated.