000			02097nab a2200193 4500
005			20260520001805.0
008			260224s2009 xxu
245	0	0	_aGeochemical characterization of Central Niger Delta Oils
260			_a _b _coct. 2009
270			_a28/06/2010 ; 28/06/2010
300			_a16 p. ; 373-382
520			_aTranscripción del resumen del autor. Oil samples from six oilfields in the Central Niger Delta were analyzed for normal alkanes, aliphatic isoprenoid hydrocarbons, aromatic hydrocarbons and biomarkers using gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The study was carried out with the aim of assessing the origin and thermal maturity of the oils and the depositional environment of the organic matter from which they were derived, and to evaluate similarities (or differences) among the oils from the Central Niger Delta in comparison to those from other parts of the Delta. The ratios of n-alkanes and aliphatic isoprenoids showed that Pr/nC17 ranged from 0.56 to 0.86 while Ph/nC18 ranged from 0.22 to 0.31 indicating that the oils were derived from organic matter of both terrestrial and marine origin. Pristane/phytane ratios ranged from 2.67 to 3.50, suggesting that the organic matter was deposited in generally oxidizing environments. The oleanane index, which ranged from 0.07 to 1.39, and other biomarker data also indicate contributions from both marine and terrestrial organic matter. Both saturated and aromatic hydrocarbon biomarker data indicate that the oils are thermally mature. The study showed that the Central Niger Delta oils have organic geochemical characteristics similar to those of oils from other parts of the Delta. However, there is a striking difference in the distribution of aromatic hydrocarbons, and this may in future be used as a tool with which oils from different parts of the Delta can be differentiated.
581			_a4
773	0		_tJournal of Petroleum Geology _g32
942			_cARTICULO
100	1		_aAkinlua, A. _935188
100	1		_aAjayi, M.A. _943251
999			_c171481 _d171481