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Histoire de la diagenèse et des remplissages des réservoirs pétroliers carbonatés d'âge mésozoïque du bassin du Sud-Est mexicain : Calage par l'approche expérimentale du comportement des inclusions fluides hydrocarbonées et aqueuses dans la calcite

Abstract : A petrographic and geochemical study of 17 well-cores from Mesozoic oil carbonate reservoirs in southern Gulf of Mexico, allowed the reconstruction of the diagenetical history mostly consisting of a primarily total dolomitisation of the onshore intern part and of the offshore part and by successive fracturing and cementing stages. An isotopic signature of carbon and oxygen cements indicates a temperature increase, and then a sudden change in the nature of the fluids at the dolomite / calcite cements transition. A PVTX study based on fluid inclusion contents of these cements allowed reconstructions of their PT trapping conditions. Fluid inclusions analytical tools and procedures have been adapted to fragile minerals. Experiments in autoclaves were used to examine trapping and reequilibration of fluid inclusions in fragile minerals. The wells have allowed the reconstruction of the burial history using PetroMod® 1D modeling tool. The combination of experimental results, 1D well models and the analytical results performed on the Mexican samples helped to date the accumulation of hydrocarbons in the reservoirs between 5.3 and 1 m.y.. Episodes of overpressure and fracturing, influenced by the diapiric activity in the basin, more intense in the northern part, led to the leak of the reservoirs during the Pliocene and Pleistocene. The study is concluded by the development of the evolution model of the Mexican deeply buried reservoirs, usable to other deeply buried reservoirs in similar tectonic context.
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https://hal.univ-lorraine.fr/tel-01748344
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Julien Bourdet. Histoire de la diagenèse et des remplissages des réservoirs pétroliers carbonatés d'âge mésozoïque du bassin du Sud-Est mexicain : Calage par l'approche expérimentale du comportement des inclusions fluides hydrocarbonées et aqueuses dans la calcite. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10003⟩. ⟨tel-01748344⟩

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