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Lien entre environnement de dépôt et diagenèse précoce : importance dans la prédiction des qualités réservoir

Abstract : Reservoir quality distribution in subsurface, within an aquifer, storage or a hydrocarbon bearing reservoir, is largely variable and hence, difficult to predict. This study focuses on the early diagenetic processes, which are considered as key in the next steps of the diagenesis of deeply buried reservoir. Based on the examples of sandstones deposited in glacial setting during Ordovician of a gas field in Algeria and tidal sandstones from a Permian formation in Australia, the objective is to show the role and control exerted by the depositional environment on early diagenesis, and especially the major role of sediment reworking to predict reservoir quality distribution. The studied reworking processes are responsible of clay incorporation into sand deposits, as clay coats around detrital gains or as pore linings. The nature of clay is then determinant in the diagenetic processes, as these coatings may enhance chemical compaction if illitic in nature, or reversely, may inhibit cementation and help preserving reservoir quality if they are made of ferrous chlorite. These reworkings are associated to fluid overpressure within the sediment in glacial settings, whilst they are associated to the permanent reworking of sands by tidal currents, enabling the agglomeration of clay flocs to detrital grains with biofilm elements acting as natural glue.
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Submitted on : Tuesday, May 19, 2020 - 5:36:08 PM
Last modification on : Wednesday, October 14, 2020 - 4:00:36 AM


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  • HAL Id : tel-02612990, version 1



Eric Portier. Lien entre environnement de dépôt et diagenèse précoce : importance dans la prédiction des qualités réservoir. Pétrographie. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLS548⟩. ⟨tel-02612990⟩



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