Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal

Mark Obinna Onyema; Michael Junior Ajie

doi:doi:10.11648/j.pse.20230701.11

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Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal

Mark Obinna Onyema, Michael Junior Ajie

Published in Petroleum Science and Engineering (Volume 7, Issue 1)

Received: 29 November 2022 Accepted: 26 December 2022 Published: 20 March 2023

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Abstract

The geochemistry of crude oils from the Niger Delta, Nigeria, were evaluated using the characterization of C₁₉ to C₃₅ terpanes. Analyses of two representative crude oils from Western and Central Niger Delta showed abundances of C₁₉ to C₂₉ tricyclic terpanes constituted 12.09% and 29.74%, C₂₄ tetracyclic terpane 0.31% and 0.15% and C₂₇ to C₃₅ pentacyclic terpanes 87.61% and 70.12%, respectively. Diagnostic ratios of terpanes indicated relatively low abundances of C₂₃, C₂₈ and C₂₉ tricyclic terpanes, low abundances of homohopanes, a significantly high abundance of oleanane and that the Niger Delta crude oils were derived from terrestrial organic matter source rocks deposited in an oxic environment during the Tertiary period. Multivariate oil-oil correlation plot showed the Western and Central Niger Delta crude oils are not distinct, but moderately related (genetically). However, diagnostic ratios of C₂₄ tetracyclic terpane, which was high and moderate and gammacerane, which was low and high, revealed crude oils from Western Niger Delta were derived from predominantly terrestrial source and crude oils from Central Niger Delta were derived from terrestrial source with input from marine organic matter, respectively. Tricyclic terpanes/hopanes and isomerization ratios of C₃₂ homohopanes indicated the Niger Delta crude oils were generated at high maturity, at top of the oil generation window.

Published in	Petroleum Science and Engineering (Volume 7, Issue 1)
DOI	10.11648/j.pse.20230701.11
Page(s)	1-6
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2023. Published by Science Publishing Group

Keywords

Geochemistry, Terpane, Correlation, Niger Delta, Gammacerane, Abundance, Crude Oil

References

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APA Style

Mark Obinna Onyema, Michael Junior Ajie. (2023). Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal. Petroleum Science and Engineering, 7(1), 1-6. https://doi.org/10.11648/j.pse.20230701.11

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ACS Style

Mark Obinna Onyema; Michael Junior Ajie. Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal. Pet. Sci. Eng. 2023, 7(1), 1-6. doi: 10.11648/j.pse.20230701.11

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AMA Style

Mark Obinna Onyema, Michael Junior Ajie. Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal. Pet Sci Eng. 2023;7(1):1-6. doi: 10.11648/j.pse.20230701.11

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@article{10.11648/j.pse.20230701.11,
  author = {Mark Obinna Onyema and Michael Junior Ajie},
  title = {Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal},
  journal = {Petroleum Science and Engineering},
  volume = {7},
  number = {1},
  pages = {1-6},
  doi = {10.11648/j.pse.20230701.11},
  url = {https://doi.org/10.11648/j.pse.20230701.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.pse.20230701.11},
  abstract = {The geochemistry of crude oils from the Niger Delta, Nigeria, were evaluated using the characterization of C19 to C35 terpanes. Analyses of two representative crude oils from Western and Central Niger Delta showed abundances of C19 to C29 tricyclic terpanes constituted 12.09% and 29.74%, C24 tetracyclic terpane 0.31% and 0.15% and C27 to C35 pentacyclic terpanes 87.61% and 70.12%, respectively. Diagnostic ratios of terpanes indicated relatively low abundances of C23, C28 and C29 tricyclic terpanes, low abundances of homohopanes, a significantly high abundance of oleanane and that the Niger Delta crude oils were derived from terrestrial organic matter source rocks deposited in an oxic environment during the Tertiary period. Multivariate oil-oil correlation plot showed the Western and Central Niger Delta crude oils are not distinct, but moderately related (genetically). However, diagnostic ratios of C24 tetracyclic terpane, which was high and moderate and gammacerane, which was low and high, revealed crude oils from Western Niger Delta were derived from predominantly terrestrial source and crude oils from Central Niger Delta were derived from terrestrial source with input from marine organic matter, respectively. Tricyclic terpanes/hopanes and isomerization ratios of C32 homohopanes indicated the Niger Delta crude oils were generated at high maturity, at top of the oil generation window.},
 year = {2023}
}

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TY  - JOUR
T1  - Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal
AU  - Mark Obinna Onyema
AU  - Michael Junior Ajie
Y1  - 2023/03/20
PY  - 2023
N1  - https://doi.org/10.11648/j.pse.20230701.11
DO  - 10.11648/j.pse.20230701.11
T2  - Petroleum Science and Engineering
JF  - Petroleum Science and Engineering
JO  - Petroleum Science and Engineering
SP  - 1
EP  - 6
PB  - Science Publishing Group
SN  - 2640-4516
UR  - https://doi.org/10.11648/j.pse.20230701.11
AB  - The geochemistry of crude oils from the Niger Delta, Nigeria, were evaluated using the characterization of C19 to C35 terpanes. Analyses of two representative crude oils from Western and Central Niger Delta showed abundances of C19 to C29 tricyclic terpanes constituted 12.09% and 29.74%, C24 tetracyclic terpane 0.31% and 0.15% and C27 to C35 pentacyclic terpanes 87.61% and 70.12%, respectively. Diagnostic ratios of terpanes indicated relatively low abundances of C23, C28 and C29 tricyclic terpanes, low abundances of homohopanes, a significantly high abundance of oleanane and that the Niger Delta crude oils were derived from terrestrial organic matter source rocks deposited in an oxic environment during the Tertiary period. Multivariate oil-oil correlation plot showed the Western and Central Niger Delta crude oils are not distinct, but moderately related (genetically). However, diagnostic ratios of C24 tetracyclic terpane, which was high and moderate and gammacerane, which was low and high, revealed crude oils from Western Niger Delta were derived from predominantly terrestrial source and crude oils from Central Niger Delta were derived from terrestrial source with input from marine organic matter, respectively. Tricyclic terpanes/hopanes and isomerization ratios of C32 homohopanes indicated the Niger Delta crude oils were generated at high maturity, at top of the oil generation window.
VL  - 7
IS  - 1
ER  -

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Author Information

Mark Obinna Onyema

Petroleum and Environmental Geochemistry Research Group, Department of Pure and Industrial Chemistry, University of Port Harcourt, Port Harcourt, Nigeria
Michael Junior Ajie

Petroleum and Environmental Geochemistry Research Group, Department of Pure and Industrial Chemistry, University of Port Harcourt, Port Harcourt, Nigeria

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APA Style

Mark Obinna Onyema, Michael Junior Ajie. (2023). Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal. Petroleum Science and Engineering, 7(1), 1-6. https://doi.org/10.11648/j.pse.20230701.11

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ACS Style

Mark Obinna Onyema; Michael Junior Ajie. Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal. Pet. Sci. Eng. 2023, 7(1), 1-6. doi: 10.11648/j.pse.20230701.11

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AMA Style

Mark Obinna Onyema, Michael Junior Ajie. Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal. Pet Sci Eng. 2023;7(1):1-6. doi: 10.11648/j.pse.20230701.11

Copy | Download

@article{10.11648/j.pse.20230701.11,
  author = {Mark Obinna Onyema and Michael Junior Ajie},
  title = {Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal},
  journal = {Petroleum Science and Engineering},
  volume = {7},
  number = {1},
  pages = {1-6},
  doi = {10.11648/j.pse.20230701.11},
  url = {https://doi.org/10.11648/j.pse.20230701.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.pse.20230701.11},
  abstract = {The geochemistry of crude oils from the Niger Delta, Nigeria, were evaluated using the characterization of C19 to C35 terpanes. Analyses of two representative crude oils from Western and Central Niger Delta showed abundances of C19 to C29 tricyclic terpanes constituted 12.09% and 29.74%, C24 tetracyclic terpane 0.31% and 0.15% and C27 to C35 pentacyclic terpanes 87.61% and 70.12%, respectively. Diagnostic ratios of terpanes indicated relatively low abundances of C23, C28 and C29 tricyclic terpanes, low abundances of homohopanes, a significantly high abundance of oleanane and that the Niger Delta crude oils were derived from terrestrial organic matter source rocks deposited in an oxic environment during the Tertiary period. Multivariate oil-oil correlation plot showed the Western and Central Niger Delta crude oils are not distinct, but moderately related (genetically). However, diagnostic ratios of C24 tetracyclic terpane, which was high and moderate and gammacerane, which was low and high, revealed crude oils from Western Niger Delta were derived from predominantly terrestrial source and crude oils from Central Niger Delta were derived from terrestrial source with input from marine organic matter, respectively. Tricyclic terpanes/hopanes and isomerization ratios of C32 homohopanes indicated the Niger Delta crude oils were generated at high maturity, at top of the oil generation window.},
 year = {2023}
}

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TY  - JOUR
T1  - Terpane Characterization of Crude Oils from Niger Delta, Nigeria: A Geochemical Appraisal
AU  - Mark Obinna Onyema
AU  - Michael Junior Ajie
Y1  - 2023/03/20
PY  - 2023
N1  - https://doi.org/10.11648/j.pse.20230701.11
DO  - 10.11648/j.pse.20230701.11
T2  - Petroleum Science and Engineering
JF  - Petroleum Science and Engineering
JO  - Petroleum Science and Engineering
SP  - 1
EP  - 6
PB  - Science Publishing Group
SN  - 2640-4516
UR  - https://doi.org/10.11648/j.pse.20230701.11
AB  - The geochemistry of crude oils from the Niger Delta, Nigeria, were evaluated using the characterization of C19 to C35 terpanes. Analyses of two representative crude oils from Western and Central Niger Delta showed abundances of C19 to C29 tricyclic terpanes constituted 12.09% and 29.74%, C24 tetracyclic terpane 0.31% and 0.15% and C27 to C35 pentacyclic terpanes 87.61% and 70.12%, respectively. Diagnostic ratios of terpanes indicated relatively low abundances of C23, C28 and C29 tricyclic terpanes, low abundances of homohopanes, a significantly high abundance of oleanane and that the Niger Delta crude oils were derived from terrestrial organic matter source rocks deposited in an oxic environment during the Tertiary period. Multivariate oil-oil correlation plot showed the Western and Central Niger Delta crude oils are not distinct, but moderately related (genetically). However, diagnostic ratios of C24 tetracyclic terpane, which was high and moderate and gammacerane, which was low and high, revealed crude oils from Western Niger Delta were derived from predominantly terrestrial source and crude oils from Central Niger Delta were derived from terrestrial source with input from marine organic matter, respectively. Tricyclic terpanes/hopanes and isomerization ratios of C32 homohopanes indicated the Niger Delta crude oils were generated at high maturity, at top of the oil generation window.
VL  - 7
IS  - 1
ER  -

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