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https://doi.org/10.51984/jopas.v20i4.1742
Copy DOIPublication Date: Dec 30, 2021 | |
License type: CC BY 4.0 |
The Sirt Basin important oil producing area in Libya is one of the richest regions in terms of hydrocarbon resources. Exploration studies of this area have shown that the oils are mixtures of several charges and may be from different source rocks particularly in the upper Cretaceous sediments this study based on organic geochemistry and organic petrographic analysis carried out on 179 cutting samples collected from four wells. From Cenomanian to upper Eocene succession within the central Sirt basin, the main aim of this study geochemical evaluation of source rocks, thermal maturation and estimate the other source rock in the area. The recorded geochemical values varied in these wells from one formation to another depending on lithology, paleoenvironment and tectonic events. Our results exposed that, The total organic carbon (TOC) values using Rock-Eval analysis showed that the Sirt Shale is considered the most important regard to hydrocarbon source potential, since it was found to reflect a high total organic carbon content 4.98 %. , (TOC) ranging (average 2.61), type–II kerogen (oil prone) and, with Hydrogen index (HI) mostly below 500. Rachmat average HI = 176 (kerogen types II, III), Organic facies analysis classified Sirt Shale in class B with dominantly amorphous high quality organic matter deposited in anoxic marine environment. Maturity evaluation result of Ro %, SCI, and Tmax oC, Formations are late immature to early mature stages.
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