3D Pore-network quantitative analysis in deformed carbonate grainstones |
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| Institution: | 1. Department of Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA;2. Department of Chemical Engineering, University of Wyoming, Laramie, WY 82071, USA;3. Department of Mathematics and Statistics, University of Wyoming, Laramie, WY 82071, USA |
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| Abstract: | This study consists of a three-dimensional (3D) assessment of the pore network properties (i.e., porosity, pore connectivity, specific surface area) 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) between the carbonate grainstones exposed in Sicily and Abruzzo, that cannot be explained by only considering the differences of porosity. In this study, the pore network properties of suitable rock samples were studied by quantitative analysis of X-ray micro-CT images using both synchrotron and microfocus sources. On the basis of the results, inferences about the control of pore network properties on permeability were made for both host rock and deformation bands. In the host rocks, high values of connectivity seem to be associated with high values of permeability, whereas higher values of the specific surface area seem to correspond to lower permeability. Within the deformation bands (DBs), both porosity and pore connectivity are reduced except for local solution-enlarged stylolites and fractures (slip surfaces) preferentially connected parallel to the DB. |
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| Keywords: | Porosity Specific surface area Connectivity density X-ray computed tomography Deformation bands |
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