Geochemical Characteristics of Six Formations Based on Organic Geochemical Parameters, Murzuq Basin, Libya | Chapter 11 | Current Research in Science and Technology Vol. 1
Cutting samples (n = 150) and Core
samples (n = 6) from the Taouratine, Dembaba, Assedjefar Marar, Awaynat Wanin,
Tanezzuft and Mamuniyat Formations (Jurassic to Ordovician), derived from wells
(A-3, B-1, H-1 and H-15), locate in the A, B and H fields, present in Murzuq
Basin were analysed. Rock-Eval Pyrolysis, Total Organic Carbon and specific
Aromatic Molecular Biomarker (by the use of chromatography- mass spectrometry
GC-MS) as geochemical parameters implemented to investigate their Lithology,
kerogen type, organic matter (OM) richness and maturity evaluation. Such
Formations are fair to very good quantity of organic matter passing in the
course of excellent source rocks, have average of organic carbon richness (TOC)
value ranged between 0.2% to 16.7% with
one anomalously rich sample at 666m (well H-1) where a dark grey shale has a TOC
content of 46.1% and high potential yield over 90000 ppm. The studied rocks are
ranged from immature to mature of hydrogen index (HI) ranged between 24 - 302
mg HC/g TOC versus pyrolysis Tmax, with dominance of kerogen II/III Type,
resulted based on HI versus oxygen index
(OI), ranged from 3 to 161 mg CO2/g TOC. The Tmax , spore colouration
(SCI) and Vitrinite Reflectance (% Ro)
as maturity parameters ranged among 425
- 445, 5 - 8.5 and 0.35 - 3 respectively. Aromatic hydrocarbon ratios by use of
gas chromatography - mass spectrometry pointed to two levels of thermal
maturity, where the high level of thermal maturity recorded in lower Silurian,
whereas the less maturity was from other formations.
Author(s) Details
Dr. S. Aboglila
Department of Geochemistry
and Environmental Chemistry, Tripoli University, Tripoli, Libya.
Dr. M. Elaalem
Department of Geochemistry
and Environmental Chemistry, Tripoli University, Tripoli, Libya.
Dr. E. Farifr
Department of Geochemistry
and Environmental Chemistry, Tripoli University, Tripoli, Libya.
Y. Ezlit
Department of Geochemistry
and Environmental Chemistry, Tripoli University, Tripoli, Libya.
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