Gas Chromatography Application as a Tool for Correlation of Crudes from Some Wells in Eastern Niger Delta Basin

Six crude samples from wells in Eastern Niger Delta were correlated using gas chromatography. These samples were collected from X1, X2, X3, X4, X5 and X6 wells in the Eastern Niger Delta Port Harcourt and Eket areas. The main objective of this study was to identify the sources rocks, nature of organic matter (OM), environment of deposition and the redox potentials in the environment. The method of interpretation involves the use of Gas Chromatographic fingerprints to know the distribution of the chemical constituents, the invariance ratio in isoheptanes, mango C7 hydrocarbon parameters and ratios of pristane to phytane, isoprenoids to Nalkane were used as tools in the correlation. The Oils separated into two groups based on distinctions in invariance ratios of light hydrocarbon from Pristane/Phytane (Pr/Ph) ratios, the sources rocks responsible for Oils in wells X4,X5 and X6 received more terrigeneous organic matter than Oils from wells X1,X2,X3 with inputs of marine organic matter but their environment of deposition was the same (Oxic environment).The Pristane/C17 ratios show they were not deposited under marine conditions. Their Phytane/nC18 ratios indicate they are characteristic of petroleum from shale source rocks.