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Study of reservoir analogues in foreland fold-and-thrust belts: sedimentology, diagenesis, deformation and fracturing of the upper cretaceous-eocene carbonate systems of the ionian zone (Southern Albania)

Abstract : The Albanian fold-and-thrust belt is well documented by means of seismic reflection profiles, potential data, wells and outcrops. The continuous Oligocene to Plio-Quaternary sedimentary records help to constrain the burial history of Mesozoic carbonate reservoirs, the deformation timing and the coupled fluid flow and diagenetic scenarios. The fracturing of the reservoir intervals has a pre-folding origin and relates to the regional flexuring in the foreland. The first cement has a meteoric origin, implying downward migration and the development of an earlier forebulge in the Ionian Basin. This fluid is highly enriched in strontium, attesting for important fluid-rock interaction with the Triassic evaporites located in diapirs. From this stage, the horizontal tectonic compression increases and the majority of the fluid migrated under high pressure, characterised by crack-seal vein. The tectonic burial increased due to the overthrusting, pointed out by the increase of the precipitation temperature of the cements. Afterwards, up- or downward migration of sulphate rich fluids allows a precipitation in thermal disequilibrium. This period corresponds to the onset of the thrusting in the Ionian Zone. The last stage characterised the uplift of the Berati belt, developing a selective karstification due to the circulation of meteoric fluid. The main results of the fluid flow modelling show that the Upper Cretaceous-Paleocene carbonate reservoirs in the Ionian zone have been charged from the Tortonian onward. Concerning the migration paths, the thrusts act principally as flow barriers in Albania, mainly due the occurrence of evaporites, except in the foreland, where they do not occur.
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Submitted on : Tuesday, June 8, 2010 - 8:00:00 AM
Last modification on : Friday, October 23, 2020 - 4:52:05 PM
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Nadège Vilasi. Study of reservoir analogues in foreland fold-and-thrust belts: sedimentology, diagenesis, deformation and fracturing of the upper cretaceous-eocene carbonate systems of the ionian zone (Southern Albania). Sciences of the Universe [physics]. École Nationale Supérieure des Mines de Paris, 2009. English. ⟨pastel-00006128⟩

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