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title of the reference :
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Amélioration des caractéristiques pétrophysiques des calcaires crayeux pélagiques par les processus de dolomitisation-dédolomitisation. Exemple des carbonates du Sénonien supérieur de Tunisie centrale.
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Publication Date:
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1992
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Author :
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Negra Mohamed Hédi, M'rabet Ali
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Catalogue type :
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Livre
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Catalogue reference :
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(FRA) C. R. Acad. Sci. Amélioration des caractéristiques pétrophysiques des calcaires crayeux pélagiques par les processus de dolomitisation-dédolomitisation. Exemple des carbonates du Sénonien supérieur de Tunisie centrale. The Upper Senonian chalky and partly conglomeratic limestones, constituting the Abiod Formation in Maknassy area, exhibit relatively high porosity values (up to 19 per cent)but low permeability (less than 1 md). Dolomitization-dedolomitization processes which create a secondary porosity (mainly intercrystalline and intracrystalline)improve the porosity and, especially, the permeability values. The improvement of petrophysical properties is particularly obvious within the chalky limestones when they are completely dolomitized: their average porosity is increased by about 5 per cent (from 14 to 19 per cent)and their permeability is multiplied by 300 (from 0.2 to 302 md). These porosity and permeability values which, at least locally, are relatively high, indicate that the Abiod Formation carbonates are considered as potential reservoir rocks in Tunisia.
Hydrocarbure ; Dolomitisation ; Pétrophysique ; Calcaire ; Milieu pélagique ; Sénonien ; Porosité ; Perméabilité ; Gisement potentiel ; Roche carbonée ; Roche carbonatée ; Crétacé supérieur ; Formation Abiod ; Tunisie M'rabet Ali Negra Mohamed Hédi Roches Sédmentaires, Sédimentologie
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Indexation decimale :
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Roches Sédmentaires, Sédimentologie
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Keywords :
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Hydrocarbure ; Dolomitisation ; Pétrophysique ; Calcaire ; Milieu pélagique ; Sénonien ; Porosité ; Perméabilité ; Gisement potentiel ; Roche carbonée ; Roche carbonatée ; Crétacé supérieur ; Formation Abiod ; Tunisie
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Summary :
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The Upper Senonian chalky and partly conglomeratic limestones, constituting the Abiod Formation in Maknassy area, exhibit relatively high porosity values (up to 19 per cent)but low permeability (less than 1 md). Dolomitization-dedolomitization processes which create a secondary porosity (mainly intercrystalline and intracrystalline)improve the porosity and, especially, the permeability values. The improvement of petrophysical properties is particularly obvious within the chalky limestones when they are completely dolomitized: their average porosity is increased by about 5 per cent (from 14 to 19 per cent)and their permeability is multiplied by 300 (from 0.2 to 302 md). These porosity and permeability values which, at least locally, are relatively high, indicate that the Abiod Formation carbonates are considered as potential reservoir rocks in Tunisia.
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