Argiles d’Azzel Formation

Argiles d’Azzel Fm

Period:

Silurian

Age Interval:

Darriwilian – Dapingian.

Province:
Oued Mya Basin

Type Locality and Naming

Synonym: Azzel Fm

References: Klett, 2000.

Lithology and Thickness

The Azzel Formation is made up entirely of silty black mudstone. Its lateral equivalents in both the Illizi and Ghadames Basins are the Edjeleh Fm and Melez Chograne Fm respectively (Klett, 2000).

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

It conformably overlies the Gres d’Ouargla Fm in the Oued Mya Basin, while it unconformably overlies the Hamra Fm in the Chotts Basin.

Upper contact

It is conformably overlain by the Gres d’Oued Saret Fm in the Oued Mya Basin, while it is unconformably overlain by the Fegaguira Fm in the Chotts Basin.

Regional extent

GeoJSON

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Fossils

Age

Age Span:

Beginning stage:

Dapingian

Fraction up in beginning stage:

0.00

Beginning date (Ma):

471.26

Ending stage:

Darriwilian

Fraction up in the ending stage:

1.0

Ending date (Ma):

458.18

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Enam O. Obiosio, Solomon Joshua Avong and Henry Nasir Suleiman (2024) - Stratigraphic Lexicon compiled from the following books:

Baouche, R., Ganguli, S. S., Sen, S., Radwan A. E. (2023): Assessment of reservoir stress state and its implications for Paleozoic tight oil reservoir development in the Oued Mya Basin, northeastern Algerian Sahara. Geosystems and Geoenvironment 2: pp.1-18. https://doi.org/10.1016/j.geogeo.2022.100112

Fadila B. (2004): Reservoir Characterization and Reservoir Modeling in the Northwestern Part of Hassi Massaoud Field Algeria. A PhD thesis at the University of Hamburg, Hamburg, Germany.

T.R. Klett (2000): Total Petroleum Systems of the Trias/Ghadames Province, Algeria, Tunisia, and Libya - The Tanezzuft-Oued Mya, Tanezzuft-Melrhir, and Tanezzuft-Ghadames. U.S. Geological Survey Bulletin, 2202-C.

Kraouia et al., (2023): Ordovician–Upper Silurian–Triassic Petroleum System Assessment in the Chotts Area. In S. Khomsi and F. Roure (eds.), Geology of North Africa and the Mediterranean: Sedimentary Basins and Georesources, Regional Geology Reviews, https://doi.org/10.1007/978-3-031-18747-6_7