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Reservoir properties of Turonian rudist-rich carbonates in Central Tunisia (the onshore of Sfax area)

  • Senda BoughalmiEmail author
  • Mohamed Hédi Negra
  • Danièle Grosheny
  • Yves Géraud
  • Moncef Saidi
AGIC 2017
  • 21 Downloads
Part of the following topical collections:
  1. Geology of North Africa and Mediterranean regions

Abstract

The present study is based on core petrographical analyses of an oil-producing Turonian carbonate reservoir in the Sfax area (central-eastern onshore of Tunisia). Sedimentological studies show that these Early-Middle Turonian carbonates consist of shallow marine bioclastic limestones, sometimes partly dolomitised, and are rich in rudists which can be associated to other bivalves, gastropods, oncoliths, benthic foraminifers and calcisphers. Facies are organised into metre-scale shallowing upward cycles, each comprising three units corresponding, from base to top, to the following: bedded, slightly argillaceous wackestones containing floating rudist debris and sometimes calcisphers; alternation of massively bedded partly dolomitised packstones rich in entire joined rudists and finely bedded wackestones-packstones containing miliolids, oncoliths and gastropods; and micritic carbonates, partly argillaceous, nodular shaped and laminated. In terms of reservoir properties, the highest values of helium porosity (reaching 27%) and permeability (reaching 700 mD) were measured in rudist-rich carbonates. Pores, which are partly filled with oil, mainly correspond to the Radiolitid cells. In addition, some diagenetic features such as dolomitisation, dedolomitisation and dissolution have created additional pores and have clearly enhanced the reservoir potential of these rudist-rich carbonates.

Keywords

Upper Cretaceous Turonian Bireno Reservoir Sedimentology Petrophysics 

Notes

Acknowledgements

This paper is a part of the PhD thesis of the first author at the University of Tunis El Manar. The authors greatly thank the anonymous reviewers for their helpful and constructive comments that improved the manuscript. We express our sincere thanks to Entreprise Tunisienne d’Activités Pétrolières (ETAP) for allowing the publication of these results.

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Senda Boughalmi
    • 1
    Email author
  • Mohamed Hédi Negra
    • 1
  • Danièle Grosheny
    • 2
  • Yves Géraud
    • 2
  • Moncef Saidi
    • 3
  1. 1.Faculty of Sciences of Tunis, U.R. Pétrologie Sédimentaire et CristallineTunis El Manar UniversityTunisTunisia
  2. 2.CNRS, CREGU, Ecole Nationale Supérieure de Géologie (ENSG)Université de LorraineVandoeuvre-les-NancyFrance
  3. 3.Entreprise Tunisienne d’Activités Pétrolières (ETAP)TunisTunisia

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