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Caractérisation de l'espace poreux de roches sédimentaires par l'étude d'équilibres capillaires

Abstract : This research is a contribution to the characterisation of porous space in sedimentary rocks. This was done by the study of capillary equilibrium in twenty different samples of which the texture was well known, belonging to various geological and geographical layers. Petrographical characteristics of the studied rocks have been defined by using various classical methods such as: visual observation, thin sections, pictures obtained by scanning electron microscope and x-ray diffraction. Three petrophysical parameters were mesured: the porosity, the permeability and the formation factor. The texture analysis was conceived using two different technics, each based on the distribution of a pair of non miscible fluids (air-water and mercury-mercury vapour) in the porous environment. The used methods are restored states and mercury porosimetry. This permits obtaining the capillary pressure curves as a function of saturation (Pf and porosimetry curves). Several parameters related to the porous space geometry can be deducted from these curves, such as the decomposition of the porosity in 2 parts: The macroporosity (access radius > 1µm) and the microporosity (access radius < 1µm) as well as the average access radius of each of them. The result then allows a classification of the samples into two categories: the monoporous and the biporous. By combining petrophysical measurements with the parameters resulting from the capillary pressure curves, allow correlations between various factors. Comparing the observations obtained by the scanning electron microscope with the capillary pressure curves assimilated to a hyperbole Y=A/X, illustrates that the factor A is in direct relation with the distribution mode of the access radius. It has also been shown that the Pf curves and the porosimetry curve can be deducted, the one from the other, by using some simple complementary manipulations.
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https://pastel.archives-ouvertes.fr/pastel-00569140
Contributor : Ecole Des Ponts Paristech <>
Submitted on : Thursday, February 24, 2011 - 1:31:37 PM
Last modification on : Thursday, September 24, 2020 - 4:00:35 PM
Long-term archiving on: : Wednesday, May 25, 2011 - 2:44:33 AM

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  • HAL Id : pastel-00569140, version 1

Citation

Antoine Iskandar. Caractérisation de l'espace poreux de roches sédimentaires par l'étude d'équilibres capillaires. Géologie appliquée. Ecole Nationale des Ponts et Chaussées, 1990. Français. ⟨pastel-00569140⟩

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