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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Document, Thesis/dissertation, Internet resource |
Document Type: | Internet Resource, Computer File |
All Authors / Contributors: |
Nihed Kracha; Jean-Luc Potdevin; Rémi Eschard; Université Lille 1 - Sciences et technologies (Villeneuve-d'Ascq / 1970-2017).; École doctorale Sciences de la matière, du rayonnement et de l'environnement (Villeneuve d'Ascq, Nord).; Géosystèmes.; IFP Energies nouvelles (Rueil-Malmaison, Hauts-de-Seine).; Société nationale pour la recherche, la production, le transport, la transformation et la commercialisation des hydrocarbures (Algérie). |
OCLC Number: | 1246682170 |
Notes: | Titre provenant de l'écran-titre. |
Description: | 1 online resource |
Responsibility: | Nihed Kracha ; sous la direction de Jean-Luc Potdevin et de Rémi Eschard. |
Abstract:
This PHD subject is related to the "Characterization of nonconventional reservoirs". It's purpose is to understand the interactions between sedimentary facies, fracturation and digenesis in a tight gas reservoir, in order to predict its hydraulic properties. This approach was applied to the "Quarzites de Hamra" formation, which is one of the most prolific reservoirs in the Algerian Paleozoic basins. This formation was deposited during Arenig time, in a shallow marine setting, and underwent during its burial history an important quartz cementation which modified its mechanical properties and porosity. Natural fractures are present at all levels and mitigate low matrix porosities, but their geometric attributes still poorly understood and difficult to predict. The thesis was focused on two field cases, located on the Panafrican suture zone, and a tight gas field located in the central part of Ahnet basin. The multi-disciplinary approach we used integrates satellite imagery, field and well data, and laboratory techniques. The results obtained show that the "Quarzites de Hamra" formation was deposited in a tidal clastic ramp. The fracture system is mainly controlled by the presence of faults. The quartz cementation was favored by the mineralogical maturity of the facies and their high mococristalline quartz content. The source of silica is internal, and related to pressure-solution phenomena. The digenetic history is succeeded by a complex history of deformation, during which a system of veins with crack-seal texture was created, followed by hydrothermal circulations resulting mainly in precipitation of phosphates and iron hydroxides.
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Related Subjects:(10)
- Réservoirs gréseux -- Perméabilité.
- Bassins sédimentaires -- Ahnet, Adrar (Algérie) -- Ordovicien.
- Silicification.
- Roches -- Fracturation.
- Sédiments (géologie) -- Ordovicien.
- Diagenèse -- Ahnet, Adrar (Algérie).
- Altération hydrothermale.
- Quartzites
- Réservoirs compacts (tight gas)
- Suture panafricaine