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Paleozoic stratigraphy and petroleum systems of the Western and Southwestern Deserts of Iraq

Adnan A. M. Aqrawi
Paleozoic stratigraphy and petroleum systems of the Western and Southwestern Deserts of Iraq
GeoArabia (Manama) (April 1998) 3 (2): 417-418


A stratigraphic scheme for the Paleozoic of the Southwestern Desert of Iraq is proposed based upon the review of recently published data from several deep wells in the western part of the country and from outcrops in other regions in Iraq. The main formations are described in terms of facies distribution, probable age, regional thickness, and correlations with the well-reported Paleozoic successions of the adjacent countries (e.g. Jordan and Saudi Arabia), as well as with the Thrust Zone of North Iraq. The Paleozoic depositional and tectonic evolution of the Western and Southwestern Deserts of Iraq, particularly during Cambrian, Ordovician and Silurian, shows marked similarity to those of eastern Jordan and northern Saudi Arabia. However, local lithological variations, which are due to Late Paleozoic Hercynian tectonics, characterize the Upper Paleozoic sequences. The Lower Silurian marine "hot" shale, 65 meters thick in the Akkas-1 well in the Western Desert, is believed to be the main Paleozoic source rock in the Western and Southwestern Deserts. Additional potential source rocks in this region could be the black shales of the Ordovician Khabour Formation, the Upper Devonian to Lower Carboniferous Ora Shale Formation, and the lower shaly beds of the Upper Permian Chia Zairi Formation. The main target reservoirs are of Ordovician, Silurian, Carboniferous and Permian ages. Similar reservoirs have recently been reported for the Western Desert of Iraq, eastern Jordan and northern Saudi Arabia. In addition, two main regional seals (Lower Silurian shales and Permian evaporites) of northeastern Arabia extend over most of the Southwestern Desert, together with several other local seals. These considerations render the unexplored Paleozoic Southwestern Desert of Iraq prospective.

ISSN: 1025-6059
Serial Title: GeoArabia (Manama)
Serial Volume: 3
Serial Issue: 2
Title: Paleozoic stratigraphy and petroleum systems of the Western and Southwestern Deserts of Iraq
Author(s): Aqrawi, Adnan A. M.
Affiliation: Smedvig Technologies, Stavanger, Norway
Pages: 417-418
Published: 199804
Text Language: English
Publisher: Gulf Petrolink in Bahrain, Manama, Bahrain
References: 68
Accession Number: 2019-017075
Categories: StratigraphyEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., geol. sketch maps, strat. cols.
N29°00'00" - N33°30'00", E34°30'00" - E39°00'00"
N17°00'00" - N32°30'00", E34°45'00" - E57°00'00"
N29°00'00" - N37°15'00", E39°00'00" - E48°30'00"
Country of Publication: Bahrain
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute.
Update Code: 201911
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