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C30 4,23,24-Trimethylsteranes in Niger Delta Oils: Discriminates Depobelts and Suggests Possible Sub-Petroleum Systems

	International Journal of Scientific Research and Engineering Development (IJSRED)	Full Text:
	Published Issue : Volume-3 Issue-4
	Year of Publication : 2020
	Unique Identification Number : IJSRED-V3I4P25
	Authors : Selegha Abrakasa, P.C. Ezidiegwu

MLA Style: Selegha Abrakasa, P.C. Ezidiegwu "C30 4,23,24-Trimethylsteranes in Niger Delta Oils: Discriminates Depobelts and Suggests Possible Sub-Petroleum Systems" International Journal of Scientific Research and Engineering Development (IJSRED) Vol3-Issue4 | 160-171.

APA Style: Selegha Abrakasa, P.C. Ezidiegwu.C30 4,23,24-Trimethylsteranes in Niger Delta Oils: Discriminates Depobelts and Suggests Possible Sub-Petroleum Systems. International Journal of Scientific Research and Engineering Development (IJSRED) Vol3-Issue4 | 160-171.

Abstract :

Some oils from different depobelts in the Niger Delta Basin were geochemically examine for the presence of C30 methylsteranes which were to serve the purpose of discriminating the depobelts upon the hypothesis that they were deposited at different geological times and different paleoenvironment with different degrees of marine organic matter contribution. The oils were fractionated and the aliphatic fraction was subjected to GC-MS analysis. C30 4-methysteranes and C30 4,23,24-trimethysterane were identified in the oils from the EIC (extracted ion chromatogram) on m/z 231 from the TIC (total ion chromatogram). A bivariant plot of B against Pr/Ph, [B= 4,23,24-trimethylsteranes/(4,23,24-trimethylsterane+4-methylsterane)] showed a gradual gradient-wise increase from the Greater Ughelli oils to the Offshore oils. This compositional variations could be due to the fact that depobelts are geologically independent indvidual megasequences impling the potential existence of sub-petroleum systems.