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- W1497118962 abstract "Campanian–Maastrichtian sedimentation in Tunisia is dominated by well-bedded micritic limestones rich in planktonic foraminifera. However, in Central Tunisia, notably in Wadi Abiod, lensoid bodies of massively bedded carbonates are frequently intercalated within the chalky pelagic lime mudstones. These lenses, whose properties are both sedimentary and diagenetic, correspond mainly to conglomeratic and bioclastic bodies related to gravity flows. They are affected by dolomitization, which modified several original textures. In terms of reservoir properties, this dolomitization can be destructive or constructive. The pelagic lime mudstones have median porosities and permeabilities which are markedly lower than those of the dolomites that have replaced them locally. Although the lower porosities in the non-dolomitized micrites could result from differential compaction, the absence of visible burial compaction fabrics suggests that the more elevated porosities in the dolomites are the consequence of dolomitization. The amelioration of permeability (0.2–300 mD) is probably the direct result of an increase in crystal size, from an average of 2 µm in the micrite to more than 150 µm in the dolomite, and, as such, is the consequence of dolomitization." @default.
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- W1497118962 date "1994-05-25" @default.
- W1497118962 modified "2023-10-11" @default.
- W1497118962 title "Permeability and Porosity Evolution in Dolomitized Upper Cretaceous Pelagic Limestones of Central Tunisia" @default.
- W1497118962 doi "https://doi.org/10.1002/9781444304077.ch17" @default.
- W1497118962 hasPublicationYear "1994" @default.
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