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title of the reference :  Diagenesis and formation water chemistry of triassic reservoir sandstones from southern Tunisia.
Publication Date: 1994
Author : Morad S., Ben Ismail Mohamed Hédi, De Ros, Al Aasm I.S.
Catalogue type : Livre
Catalogue reference : Vol.41 (NLD) Sedimentology Vol.41 Diagenesis and formation water chemistry of triassic reservoir sandstones from southern Tunisia. The fluvial Triassic reservoir subarkoses and arkoses (2409.5-2519.45 m)of the El Borma oilfield, southern Tunisia, were subjected to cementation by haematite, anatase, infiltrated clays, kaolonite and K-feldspar at shallow burial depths from meteoric waters. Subsequently, basinal brines controlled the diagenetic evolution of the sanstones and resulted initially in the precipitation of quartz overgrowths, magnesian siderite, minor ferroan magnesite and anhydrite. the enrichment of siderite en 12C isotope results from derivation of carbon from the thermal decarboxylation of organic matter. During further burial, the precipitation of dickite and pervasive transformation of kaolonite into dickite occurred, followed by the formation of microcrystalline K-feldspar and quatz, chlorite and illite, prior to the emplacement for oil. Present day formation waters are Na-Ca-Cl brines evolved by the evaporation of seawater and water/mineral interaction and are in equilibrium with the deep burial minerals. These waters are suggested to be derived from the underlying Silurian and Devonien dolomitic mudstones. bibliogr. diagenèse ; radiocarbone ; Trias ; Silurien ; Dévonien ; Tunisie ; Tunisie Sud Occidentale ; el Borma Ben Ismail Mohamed Hédi De Ros Al Aasm I.S. Morad S. Roches Sédmentaires, Sédimentologie
Indexation decimale : Roches Sédmentaires, Sédimentologie
Keywords : diagenèse ; radiocarbone ; Trias ; Silurien ; Dévonien ; Tunisie ; Tunisie Sud Occidentale ; el Borma
Summary : The fluvial Triassic reservoir subarkoses and arkoses (2409.5-2519.45 m)of the El Borma oilfield, southern Tunisia, were subjected to cementation by haematite, anatase, infiltrated clays, kaolonite and K-feldspar at shallow burial depths from meteoric waters. Subsequently, basinal brines controlled the diagenetic evolution of the sanstones and resulted initially in the precipitation of quartz overgrowths, magnesian siderite, minor ferroan magnesite and anhydrite. the enrichment of siderite en 12C isotope results from derivation of carbon from the thermal decarboxylation of organic matter. During further burial, the precipitation of dickite and pervasive transformation of kaolonite into dickite occurred, followed by the formation of microcrystalline K-feldspar and quatz, chlorite and illite, prior to the emplacement for oil. Present day formation waters are Na-Ca-Cl brines evolved by the evaporation of seawater and water/mineral interaction and are in equilibrium with the deep burial minerals. These waters are suggested to be derived from the underlying Silurian and Devonien dolomitic mudstones.
Exemplaries : TU1810B, TU1810A


 

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