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Caractérisation, estimation et valorisation de gisements d'argiles kaoliniques du bassin des Charentes

Abstract : The kaolinitic clays have been exploited for more than a hundred years, in the western part of the Charentes basin, and belong to the paleo-deltaic network. The genesis of the kaolin deposit of the Charentes basin obeys the simple geological rules, but their detailed geometry has a great complexity, reinforced by the fact that one must distinguish from clays, very different qualities.
The recent deposits are relatively richer in alumina in comparison with the older ones. These deposits which are deeper than the old ones have undergone often more intense post-sedimentary phenomena. In this study, the chemical composition of the various deposits of this basin is studied. The formation of hyperaluminous clays is particularly studied.
The available data are the results of chemical analysis of the kaolinitic core samples. This data are used to improve our knowledge on the kaolins compositions of different classes and different deposits by using the statistical analyses.
Geostatistical methods are proposed for the study of the Charentes deposits and are applied to some of them. The problems of the application of the geostatistical tools for this kind of deposit are described, and the more adapted methods are proposed.
We insist on the importance of the spatial variability of the chemical composition on the management of exploration, extraction/classification and production. We show how the use of these tools can help us to better manage the production, from the kaolin deposits.
The geostatistical simulations help us to visualize the spatial variability of the various categories of kaolins. They were implemented within the framework of the trucked gaussian methods (pluri-gaussians). Two cases were treated: simulation of argillaceous facies (distinguished mainly by the visual criteria), and simulation of kaolin classes defined by their content of Al2O3.
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Submitted on : Tuesday, December 18, 2007 - 4:21:56 PM
Last modification on : Thursday, September 24, 2020 - 4:34:09 PM
Long-term archiving on: : Thursday, September 27, 2012 - 11:50:09 AM

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  • HAL Id : tel-00199226, version 1

Citation

Mohammad Koneshloo. Caractérisation, estimation et valorisation de gisements d'argiles kaoliniques du bassin des Charentes. Sciences de l'ingénieur [physics]. École Nationale Supérieure des Mines de Paris, 2007. Français. ⟨NNT : 2007ENMP1486⟩. ⟨tel-00199226⟩

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