Hydrocarbon Potential and Biomarker Studies of EE-1 Well, Offshore Eastern Dahomey Basin, SW Nigeria

Matthew E. Nton; Emeka E. Emordi; Irewole Ayodele

doi:10.2478/rmzmag-2021-0011

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Hydrocarbon Potential and Biomarker Studies of EE-1 Well, Offshore Eastern Dahomey Basin, SW Nigeria

Materials and Geoenvironment

Volume 69 (2022): Issue 1 (June 2022)

By: Matthew E. Nton, Emeka E. Emordi and Irewole Ayodele

Open Access

|Sep 2023

Abstract

The hydrocarbon potential, organic source input, and paleodepositional environment of subsurface sediments from EE-1 well, offshore Eastern Dahomey Basin, were assessed using Rock-Eval pyrolysis and biomarker geochemistry. The total organic carbon (TOC) and soluble organic matter (SOM) in the sediments ranged from 0.96wt% to 8.92wt% and 676.12 ppm to 2883.85 ppm, respectively, indicating adequate to excellent organic richness. The pseudo-Van Krevelen plot classified the sediments as types II and III kerogen, which have the potential to generate both oil and gas. The T_max and production index (PI) ranged from 422°C to 431°C (average, 426°C) and 0.03 to 0.24, respectively, suggesting low thermal maturity. The presence of C₂₇–C₂₉ steranes, oleanane, and hopane/sterane ratio (1.53/16.11), indicated organic matter from mixed sources with more terrigenous input. Cross plots of Pr/nC₁₇ against Ph/nC₁₈, C₃₅/C₃₁ – C₃₅ homohopane index (0.05 – 0.17) and other related biomarker ratios such as C₂₁/C₂₃ trycyclic terpane ratio (0.33 – 0.82) signified that the sediments were deposited in mixed marine/terrigenous environment under oxic – suboxic conditions. This study has demonstrated that sediments had adequate organic matter with the potential to generate both oil and gas at appropriate thermal maturity.

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Articles in this issue

DOI: https://doi.org/10.2478/rmzmag-2021-0011 | Journal eISSN: 1854-7400

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Language: English, Slovenian

Page range: 33 - 46

Submitted on: Jul 2, 2021

Accepted on: Jan 18, 2022

Published on: Sep 4, 2023

Published by: Sciendo

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

hydrocarbon potential,

biomarker,

Dahomey Basin

Related subjects:

Computer sciences,

Databases and data mining,

Geosciences,

Geodesy,

Geology and mineralogy,

Materials sciences,

Materials characterization and properties

© 2023 Matthew E. Nton, Emeka E. Emordi, Irewole Ayodele, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Volume 69 (2022): Issue 1 (June 2022)