ORGANIC GEOCHEMISTRY OF THE LOWER SILURIAN TANEZZUFT FORMATION AND BIOMARKER CHARACTERISTICS OF CRUDE OILS FROM THE GHADAMES BASIN, LIBYA
作者： W. Sh. El Diasty , S. Y. El Beialy , F. I. Fadeel , K. E. Peters , D. J. Batten
DOI: 10.1111/JPG.12677
关键词:
摘要: The Ghadames Basin of NW Libya contains more than 10 B brls oil-equivalent in Palaeozoic siliciclastic reservoirs which are charged by organic-rich “hot shales” the Lower Silurian (Rhuddanian) Tanezzuft Formation. Geochemical analysis 85 shale samples and ten oils from three fields (NC2, NC4 NC7) central northern part basin provides a robust description – Mamuniyat/Acacus petroleum system this region, associated source facies oil families. underwent total organic carbon (TOC) Rock-Eval pyrolysis, crude were analysed gas chromatography flame ionization detection (GC-FID) GC-mass spectrometry (GC-MS) saturated aromatic hydrocarbon fractions, accompanied stable isotopic analysis. Organic matter ranges Type II to mixed II/III kerogen with varying generation potential early main stages window. The characterised low sulphur, nickel vanadium contents, relatively high API gravity (34.9–46.8oAPI). Biomarkers suggest that they generated marine shales containing abundant deposited mildly anoxic suboxic conditions dominance C29 over C27 or C28 steranes, indicative rich brown algae cyanobacteria. Their close stratigraphic association biomarker characteristics support for Mamuniyat Acacus fields. Maturity-related parameters based on terpanes, hydrocarbons molecular-weight hydrocarbons, peak oil-generation window. ZE3-NC7, A19-NC7 A20 NC7 field significantly mature those NC2 This indicates difference expulsion timing may be related presence two fault-triggered vertical migration preceding during Neogene.
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