Datation des hydrocarbures par la méthode Re-Os : étude expérimentale du comportement géochimique du couple Re-Os dans les pétroles durant l’évolution d’un système pétrolier

Abstract : The Re-Os radiogenic system is well adapted to the dating of oils and bitumen. However the meaning of the obtained age is ambiguous. This is mainly due to gaps in our knowledge of the geochemical behavior and the speciation of Re and Os in oils. Specifically, use of the Re-Os system requires an understanding of how Re-Os behavior can lead to the fulfillment of the conditions necessary for the development of an isochron. These conditions are: 1) the isotopic homogenization of oils at the scale of a petroleum field 2) the fractionation of Re from Os so as to obtain samples with various Re/Os ratios 3) the closure of the system during the period of radiogenic ingrowth of the daughter isotope, that is, from the time of the event of interest to the present day. Experimental investigation of the organic geochemical behavior of Re and Os in oils under various conditions, designed as analogs of the different stages of petroleum generation and evolution, were performed in order to evaluate the use of the Re-Os system as a geochronometer in the context of a direct use on petroleum. The possibility of Re-Os fractionation resulting from asphaltene loss during oil evolution was investigated by sequential asphaltene precipitation in the laboratory. The possibility of metal transfer from formation waters to petroleum was studied by performing contact experiments between oils and aqueous solutions of Re and Os of various concentrations over a wide range of temperatures and for varying periods of time. Finally, the study by X-ray absorption spectroscopy of Re and Os in oils artificially enriched in these elements contributed to the proposal of a mechanism for Re and Os incorporation at the oil-water interface
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Fatima Mahdaoui. Datation des hydrocarbures par la méthode Re-Os : étude expérimentale du comportement géochimique du couple Re-Os dans les pétroles durant l’évolution d’un système pétrolier. Sciences de la Terre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0356⟩. ⟨tel-01751650⟩

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