Description de carottes par Y. Makhloufi à la carothèque de Total (Photo P.-Y. Collin)
L’article : “Impact of sedimentology and diagenesis on the petrophysical properties of a tight oolitic carbonate reservoir. The case of the Oolithe Blanche Formation (Bathonian, Paris Basin, France)” Makhloufi, Y.; Collin, P.Y.; Bergerat, F.; Casteleyn, L.; Claes, S.; David, C.; Menendez, B.; Monna, F.; Robion, P.; Sizun, J.-P.; Swennen, R.; Rigollet, C. vient d’être publiée à Marine and Petroleum Geology. (2013) 48, 323-340. [pdf]
Dans le cadre de sa thèse de doctorat Yasin Makhloufi (email: yasin.makhloufi@gmail.com; co-dir thèse: P.-Y. Collin, Lab. Biogéosciences) a étudié plus particulièrement la formation “Oolithe Blanche” du bassin de Paris. Le but est d’identifier les paramètres qui gouvernent la qualité des réservoirs: conditions de dépôt, histoire diagénétique et propriétés pétrophysiques…
Abstract: The Oolithe Blanche Formation was studied in three quarries, located at the south-eastern edge of the Paris Basin (France). Heterogeneities in reservoir properties were assessed through a sedimentological, diagenetic and petrophysical study. The relationships between depositional settings, diagenesis and petrophysical properties were analysed using detailed petrographic studies, image analysis, Nano CTscans and petrophysical measurements. The carbonate reservoir pore network is mainly controlled by intraparticle microporosity which ensures the connectivity with interparticle meso- and macroporosity. Early cementation vs. early compaction processes (mainly grain interpenetration) may have considerable influence on fluid-flow properties and parameters such as permeability, acoustic velocities and tortuosity. Better reservoir properties are found when compaction processes begin before cementation. From statistical analyses, e.g. Principal Component Analysis and Linear Discriminant Analysis, a sedimentological/diagenetic and petrophysical model is proposed that is in a good agreement with the geological model developed from field work.