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Diagenetic and thermal history of the Jurassic-Tertiary succession of the Zagros Mountains in the Dezful Embayment (SW Iran): constraints from fluid inclusions

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Abstract

To constraint the diagenetic and thermal history in the Mesozoic-Tertiary succession of the Zagros Fold-Belt, a study was performed on fluid inclusions trapped in intergranular, vug, and fracture-filling cements in Jurassic to Miocene outcrop samples collected along the Anneh and Fahliyan Valleys of Khuzestan Province, southwest Iran. Petrographic observations showed at least two systems of fractures that postdate intergranular cementation. Two different types of oil-filled fluid inclusions occur in the intergranular cements and in the first fracture network, but they are absent in the second fracture network. Microthermometry of fluid inclusions was used to determine the temperature and salinity of fluids responsible for mineral precipitation. Within intergranular cements and calcite fillings the oldest fractures, precipitation occurred from high saline fluids in a temperature range of 60–120°C, depending on the stratigraphic depth. The strong correlation between fluid inclusions temperature and stratigraphic depth suggests that the intergranular cementation and the first fracture-filling event occurred prior to structural deformation. Furthermore, this correlation indicates a relatively constant paleogeothermal gradient at the time of cement precipitation of about 28°C/Km. On the contrary, fluid inclusions trapped in cements within the second fracture network lack oil and contain freshwater trapped at low temperatures that do not correlate to the stratigraphic position. This suggests second fracturing event occurred after oil migration and during or after deformation of the Zagros Fold-Belt, when the samples were in a near-surface position.

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Acknowledgments

This research is part of an Edison R&D project dealing with diagenesis in carbonate reservoirs. Financial support was provided by Edison S.p.A. and FAR (Pavia University). Anita Csoma, Jürgen Grötsch, and Conxita Taberner are kindly acknowledged for their careful reviews and for their contributions that allowed improving the original manuscript.

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Authors and Affiliations

  1. Dipartimento di Scienze della Terra, Università di Pavia, Pavia, Italy

    A. Ceriani & A. Di Giulio

  2. Edison S.p.A., Milan, Italy

    R. Calabrò & R. Buonaguro

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  1. A. Ceriani
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  2. R. Calabrò
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  3. A. Di Giulio
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  4. R. Buonaguro
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Correspondence to A. Ceriani.

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Ceriani, A., Calabrò, R., Di Giulio, A. et al. Diagenetic and thermal history of the Jurassic-Tertiary succession of the Zagros Mountains in the Dezful Embayment (SW Iran): constraints from fluid inclusions. Int J Earth Sci (Geol Rundsch) 100, 1265–1281 (2011). https://doi.org/10.1007/s00531-010-0530-5

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  • DOI: https://doi.org/10.1007/s00531-010-0530-5

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