Infracambrian sediments in Libyan sedimentary basins
Published:January 01, 2009
H. Benshati, A. Khoja, M. Sola, 2009. "Infracambrian sediments in Libyan sedimentary basins", Global Neoproterozoic Petroleum Systems: The Emerging Potential in North Africa, J. Craig, J. Thurow, B. Thusu, A. Whitham, Y. Abutarruma
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Infracambrian sediments are widely distributed in Libya, outcropping on the eastern and western margins of Al Kufrah Basin and the eastern margin of Murzuq Basin. The sediments have been penetrated in the Central Cyrenaica Platform, Concession 10, NW Sirte Basin, and Block NC115, NW Murzuq Basin.
There are two main subdivisions. The first is metamorphosed due to local volcanism in the Murzuq and Al Kufrah basins. The second is unaltered and has been penetrated in the NW Sirte Basin. It occurs as outcropping limestone on the eastern margin of the Murzuq Basin.
These sediments generally show lateral thickness variability, with the thickest section, approximately 991–1067 m, in the Cyrenaica Platform. Individual units show thinning towards the Precambrian basement highs, and both fining-up and coarsening-up successions. Two-dimensional seismic data acquired by the operating companies AGIP and AGOCO in the southern Al Kufrah Basin image strata presumed to be Infracambrian.
The Infracambrian sediments were probably deposited as lens-shaped bodies in palaeo-lows (graben, half-graben and troughs) alongside Precambrian basement highs, trending NW–SE in the Cyrenaica platform and NE–SW in the Al Kufrah and Murzuq basins. These sediments show lateral facies changes and their nomenclature differs across the basins. Palynological and palaeontological studies suggest a Late Riphean age.
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Global Neoproterozoic Petroleum Systems: The Emerging Potential in North Africa
Neoproterozoic successions are major hydrocarbon producers around the world. In North Africa, large basins with significant surface outcrops and thick sedimentary fills are widespread. These basins are now emerging as potential sources of hydrocarbons and are attracting interest from geological researchers in academia and the oil and gas industry.
This volume focuses on recent developments in the understanding and correlation of North African basin fills and explores novel approaches to prospecting for source and reservoir rocks. The papers cover aspects of petroleum prospectivity and age-equivalent global petroleum systems, Neoproterozoic tectonics and palaeogeography, sequence stratigraphy, glacial events and global climatic models, faunal and floral evolution and the deposition of source rocks.
The broader aim of this volume is to compare major environmental change, the emergence of life, the global carbon cycle and the implications for hydrocarbon exploration of well-studied Neoproterozoic successions worldwide.