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STRATI 2013 pp 815-820 | Cite as

Sequence Stratigraphy of the Cambrian and Ordovician Series in the Illizi Basin (Algeria)

  • Khemissi ZelloufEmail author
  • Hamid Aït Salem
Conference paper
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

The Cambro–Ordovician sediments of the Southeast Saharan Platform show a facies evolution from continent to platform rather than from platform to basin and, for that reason, faciological stratigraphy (Homewood et al. 1992) has been applied. The genetic sequences are limited at their bases and tops by Maximum Flooding Surfaces (MFSs). These surfaces mark the transition between retrogradation and progradation, and are the best isochronous surfaces and easy to identify. The “Infra Tassilian Surface” or “Pan-African Surface” marking the contact between the basement and the sedimentary facies is flat and no alteration horizon is visible. The sediments are anisometric and clean, with conglomerates containing rounded gravel and sandy quartz grains. Kazi Tani (2000) considered the contact to be a marine abrasion surface. Evidence exists for eight third-order cycles, and the key surfaces (MFSs) that define them have been dated using biostratigraphy. Correlations have been made between the Tassilis outcrop series and wells. New oil stratigraphic traps and argillaceous seal rocks have been found. In this study, it was discovered that the marine flooding surfaces present two important characteristics in the formation of the stratigraphic traps: the formation of pinch-out reservoirs, and the very widespread, impermeable argillaceous facies constituting the cover of the traps. Therefore, the MFSs are presented as a new feature to be considered in the exploration for oil in this region.

Keywords

Cambro–Ordovician Genetic sequences Flooding surfaces Correlations Stratigraphic traps Southeastern Sahara 

References

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Département gisementUniversité de BoumerdèsBoumerdèsAlgeria
  2. 2.Sonatrach/CRD (Centre de Recherche et Développement)BoumerdèsAlgeria

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