Abstract
The present paper compares Rock-Eval pyrolysis (RE), liquid chromatography (L.C), and gas chromatography-mass spectrometry (GC–MS) data from a geochemical study of Jebel Chaker organic-rich facies, in central-northern Tunisia, in order to obtain independent parameters on organic matter source, composition, and thermal maturity. This study shows a clear evidence of planktonic organic matter as indicated by the hydrogen index, n-alkanes distribution, predominance of saturated, and the high concentration of cholestane. The thermal maturity of Ypresian organic matter was estimated by T max, abundance of hetero (N.S.O) compounds, and sterane geochemical parameters such as C 29 αα 20S / (20S + 20R) and C 29 ββ (ββ + αα) maturity ratios…, to be of low thermal maturity (end of diagenesis–beginning of catagenesis). These data reveal a close concordance between RE, L.C., and GC/MS data, and show that these methods remain valuable and practical for geochemical characterization of sedimentary organic matter.
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