Abstract
A total of 17 crude oil samples from producing wells in the eastern Niger Delta were analyzed for their thermal maturity status. The study is aimed at establishing maturity trends across the area and identifying maturity parameters that can be reliably used for maturity assessment of the area. On the basis of the geography, the study area has been subdivided into eastern, western, and central areas. The oils were analyzed using gas chromatography (GC) and gas chromatography–mass spectrometry (GC–MS). The results showed that the pristane/phytane (Pr/Ph) ratio ranges from 2.3 to 5.1, which indicates that the oils were derived from mixed terrigenous/marine organic matter. The sterane and hopane results based on thermal maturity parameters were unreliable for oil maturity assessment. Aromatic maturity parameters worked better for thermal maturity assessment of the oil samples analyzed. The conclusion was based on the plots of 4-methyl dibenzothiophene/1-methyl dibenzothiophene (MDR), C27 17α (H)/C27 18α (H) (...
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