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        Multivariate analysis of source and maturity biomarker indices of crude oils from SW Niger Delta

        Leo C. Osuji,Nicolas C. Oforka,Mudiaga C. Onojake 한국지질과학협의회 2014 Geosciences Journal Vol.18 No.3

        Saturated biomarker source and maturity parametersobtained from Gas chromatography-mass spectrometry wereanalyzed using multivariate statistical methods to maximize diagnosticinformation on the hopanes and sterane spectrum. This statisticalmethod provided the identification of structural relationships(similarities and differences) between various fingerprint descriptorsfor the crude oil samples. The results emphasized the separation ofthe oil samples in regards to their locations into two genetic families. This separation pattern is more evident when principal componentanalysis was applied to biomarker data compared with the standardbiomarker cross-plots. Such compositional differences are commonlyattributed to unique source rock paleodepositional environments. The plotted source and maturity diagnostic parameter in a dendrogramseparated the oils into two families both having terrestrialinput. The group that have higher terrestrial input contain moreoleananes, and have the highest Pr/Ph ratio. They are generated fromsource rocks with a high abundance of terrestrial organic matter. Thesecond groups of oils have mixes of terrestrial and marine organicmatter with lesser amount of oleananes.

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