Compositional Heterogeneity of Hopanoid in Crude Oil: A Case Study of Selected Wells from Eric Field, Niger Delta Nigeria
- September 22, 2020
- Posted by: RSIS Team
- Categories: Automobile Engineering, IJRIAS
International Journal of Research and Innovation in Applied Science (IJRIAS) | Volume V, Issue III, January 2020 | ISSN 2454–6186
Eric U. Eche1, AbrakasaSelegha.2, Nnamdi J. Ajah1, Joshua O. Mene2, Kenechukwu O. Ezebialu3, Frank A. Diete- Spiff1
1Centre for Petroleum Geosciences, University of Port Harcourt, Port Harcourt, Nigeria
2Department of Geology, University of Port Harcourt, Port Harcourt, Nigeria
3Center of Excellence in Geosciences and Petroleum Engineering, University of Benin, Nigeria
Abstract- The research aims at evaluating compositional heterogeneity of biomarkers in crude oils from Eric Field by means of biomarker parameters and ratios. Four oil samples were obtained from Eric Field Off-shore Niger Delta Nigeria. The oils were studied by means of gas chromatography mass spectrometry (GC-MS) to obtain information on origin, occurrence, environment of deposition and thermal maturity. The thermal maturity parameter calculated from GC/GC-MS analysis ranges from Ts/Ts+Tm (0.42-0.17), C3122S/C3122S+22R (0.51-0.53), C31/C32-C34 and C30Ol/C30Ol+C30H (0.16-0.590). Biomarker parameters and ratios calculated shows that the studied oil is from clay-rich organic matter input, deposited under suboxic-oxic condition with high marine organic material input and low mixed organic material input. The lateral thermal maturity gradient indicates that the source rock is uniformly matured from North to South, these suggests high prospectivity from North to South of the Field. The Field section within the study area indicates variation in oil water contact due to faulting and tectonic activities.Assessment of compositional variation in these oil samples using biomarker ratios and parameters revealed compositionalheterogeneity. And this suggests that the reservoir is compartmentalized, andthe fluids are not communicating.
Keywords- Homohopane; Hopanoid; Oleanane; Crude oil; Heterogeneity
