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) |
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| Affiliation: | 1. Department of Stratigraphy and Paleontology, Faculty of Science, University of Granada, Fuentenueva s/n Av., 18002, Granada, Spain;2. Department of Petrology and Geochemistry, Faculty of Geological Science, University Complutense Madrid, José Antonio Novais 12 St., 28040, Madrid, Spain;3. Institute of Geosciences, UCM-CSIC, José Antonio Novais 12 St., 28040, Madrid, Spain;4. Department of Earth Sciences, University of Zaragoza, Pedro Cerbuna 12 St., 50009, Zaragoza, Spain;1. University of Geneva, Department of Earth Sciences, Rue des Maraîchers 13, CH-1205 Genève, Switzerland;2. Asian School of the Environment, 62 Nanyang Drive, 637459, Singapore;3. Far Eastern Federal University, 690950, ul. Sukhanova, 8, Vladivostok, Russia;4. Far Eastern Geological Institute, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok, Russia |
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| 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 CT-scans 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. |
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| Keywords: | Paris Basin Ooids Tight carbonate reservoir Diagenesis Petrophysics Porosity Permeability Fluid-flow properties |
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