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

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

Saturated biomarker source and maturity parameters obtained from Gas chromatography-mass spectrometry were analyzed using multivariate statistical methods to maximize diagnostic information on the hopanes and sterane spectrum. This statistical method provided the identification of structural relatio...

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Bibliographic Details
Published in:Geosciences journal (Seoul, Korea) Vol. 18; no. 3; pp. 365 - 371
Main Authors: Osuji, Leo C., Oforka, Nicolas C., Onojake, Mudiaga C.
Format: Journal Article
Language:English
Published: Heidelberg The Geological Society of Korea 01-09-2014
Springer Nature B.V
한국지질과학협의회
Subjects:
Biomarkers
Crude oil
Earth and Environmental Science
Earth Sciences
Gas chromatography
Mass spectrometry
Maturity
Multivariate analysis
Organic matter
Principal components analysis
Rocks
Statistical methods
Terrestrial environments
지질학
Niger Delta
multivariate
oleananes
saturated biomarker
hopanes
steranes
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Summary:Saturated biomarker source and maturity parameters obtained from Gas chromatography-mass spectrometry were analyzed using multivariate statistical methods to maximize diagnostic information on the hopanes and sterane spectrum. This statistical method provided the identification of structural relationships (similarities and differences) between various fingerprint descriptors for the crude oil samples. The results emphasized the separation of the oil samples in regards to their locations into two genetic families. This separation pattern is more evident when principal component analysis was applied to biomarker data compared with the standard biomarker cross-plots. Such compositional differences are commonly attributed to unique source rock paleodepositional environments. The plotted source and maturity diagnostic parameter in a dendrogram separated the oils into two families both having terrestrial input. The group that have higher terrestrial input contain more oleananes, and have the highest Pr/Ph ratio. They are generated from source rocks with a high abundance of terrestrial organic matter. The second groups of oils have mixes of terrestrial and marine organic matter with lesser amount of oleananes.
Bibliography:G704-000565.2014.18.3.009
ISSN:1226-4806
1598-7477
DOI:10.1007/s12303-014-0001-2