Hydrocarbon prospectivity of Nigeria's inland basins: From the viewpoint of organic geochemistry and organic petrology

Petrology, Rank And Geochemical Evaluation Of Maastrichtian Coals From Se Nigeria: Implication For Petroleum Generation.

“…With increasing maturity, 17α(H)-trisnorhopanes (T m ) normally transform to 18α(H)-trisnorneohopanes (T s ) and moretanes(m) to 17α(H)21β(H)-hopanes(αβH) (Meyers and Snowdon, 1993). However, the trend observed in this study shows that the Ts is dependent on the lithology and is generally suppressed in the coals compared to shales of the same vitrinite reflectance maturity (Obaje et al, 2004). 18α(H)-trisnorneohopanes does not appear in the coaly facies until a vitrinite reflectance maturity of about 0.7% (R o ) is attained, whereas in the shales the T s begins to appear already as early as R o maturity of about 0.5%.…”

“…7). However, the location of the highest HI samples could be assigned to a high-potential type III kerogen at the diagenesis/catagenesis boundary (Obaje et al, 2004). This backed up by the nonoccurrence of notable type I organic matter in the petrographic (maceral) facies (Fig.…”

“…www.iosrjournals.org 24 | Page north of the Benue Trough in Chad and the Sudan, and gas and oil shows have also been reported in Niger (Obaje et al, 2004). As a part of an on-going study of the evolution of the Nigerian coal basins and the burial histories of the Cretaceous-Tertiary sedimentary succession, we have carried out detailed petrographic analyses of 87 coal samples collected during field work between 2004 and 2006.…”

“…Petersen and Nytoft, 2006), the liptinite macerals are more paraffinic in structure and they are likely to be more oil-prone than the huminite. This is favourable for the oil-proneness of the coals, as the oil expulsion efficiency is dependent on the coals' ability to generate long-chain aliphatics (>C [20][21][22][23][24][25] ) (Isaksen et al, 1998). Gas chromatography and gas chromatography-mass spectrometry analyses of the lipid extracts reported biomarkers with a dominance of long-chain n-alkanes (C 24 -C 31 ) with obvious odd-over-even predominance (Fig.…”

Determination of Trace Metals and Depositional Environment of Organic Matter from Oil Sands, Ondo, SW Nigeria

“…These values of OEP for immature higher plant contributions are often >1.0 but approach 1.0 with increasing maturity [12], [14]. The CPI results gotten from tar sand could be said that majority of the terrestrial material is probably transported by fluvial processes and deposited under marginal to marine environments [15]- [16] which contribute to the marine source of OM in the Ondo samples. The ratio of C 31 / C 31 + C 29 varies from 1.00 and 3.60 with mean value of 1.95 (Table 3).…”