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

Matthew E. Nton
Matthew E. Nton
, 
Emeka E. Emordi
Emeka E. Emordi
 and 
Irewole Ayodele
Irewole Ayodele
   | Sep 04, 2023
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Article Category: Original Scientific Article
Published Online: Sep 04, 2023
Page range: 33 - 46
Received: Jul 02, 2021
Accepted: Jan 18, 2022
DOI: https://doi.org/10.2478/rmzmag-2021-0011
Keywords
© 2022 Matthew E. Nton et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Regional map of four countries showing the location of the Benin (Dahomey) Basin in the Gulf of Guinea [11].
Regional map of four countries showing the location of the Benin (Dahomey) Basin in the Gulf of Guinea [11].

Figure 2

Dahomey embayment showing the study area (after d’Almeida et al. [14]).
Dahomey embayment showing the study area (after d’Almeida et al. [14]).

Figure 3

Lithological log of the studied section of EE-1 Well.
Lithological log of the studied section of EE-1 Well.

Figure 4

A cross plot of hydrogen index (HI) versus oxygen index (OI) showing that the organic matter of the studied well is of types II and type III kerogen (Modified after Van Krevelen [29]).
A cross plot of hydrogen index (HI) versus oxygen index (OI) showing that the organic matter of the studied well is of types II and type III kerogen (Modified after Van Krevelen [29]).

Figure 5

A cross plot of remaining hydrocarbon potential (S2) against total organic content (TOC) showing the organic matter type and origin (after Jackson et al. [30]).
A cross plot of remaining hydrocarbon potential (S2) against total organic content (TOC) showing the organic matter type and origin (after Jackson et al. [30]).

Figure 6

Plot of hydrogen index (HI) against Tmax showing that the kerogen is in the immature window [33].
Plot of hydrogen index (HI) against Tmax showing that the kerogen is in the immature window [33].

Figure 7

Total ion chromatograms showing the distribution of the saturated hydrocarbon fraction of representative Samples 4B and 6B from the study well.
Total ion chromatograms showing the distribution of the saturated hydrocarbon fraction of representative Samples 4B and 6B from the study well.

Figure 8

Cross plot of Pr/n-C17 versus Ph/n-C18 showing the sources of organic matter and the depositional environment (Modified after Cortes et al. [39]).
Cross plot of Pr/n-C17 versus Ph/n-C18 showing the sources of organic matter and the depositional environment (Modified after Cortes et al. [39]).

Figure 9

m/z 217 mass chromatograms showing the distribution of steranes and diasteranes in the selected samples 4B and 12B.
m/z 217 mass chromatograms showing the distribution of steranes and diasteranes in the selected samples 4B and 12B.

Figure 10

m/z 191 mass chromatograms showing the distribution of terpanes and hopanes in the EE-1 Well samples 4B and 12B.12B.
m/z 191 mass chromatograms showing the distribution of terpanes and hopanes in the EE-1 Well samples 4B and 12B.12B.

Figure 11

Ternary plot showing distribution of C27, C28, and C29 steranes for EE-1 Well. (After Huang and Meinschein [49]).
Ternary plot showing distribution of C27, C28, and C29 steranes for EE-1 Well. (After Huang and Meinschein [49]).

Data showing values of isoprenoids, isoprenoids/n-alkane ratios and other parameters for EE-1 well.

Sample ID Pr/Ph Pr/n-C17 Ph/n-C18 CPI OEP-1 OEP-2
1B 1.47 0.98 0.62 1.93 0.51 0.83
2B 1.74 1.20 0.90 1.66 0.45 0.76
4B 2.38 2.41 1.08 1.70 0.51 0.8
6B 2.05 2.99 1.83 1.51 0.46 0.62
7B 3.20 2.42 1.40 1.67 0.53 0.7
8B 2.33 1.58 0.76 1.23 0.39 0.51
9B 1.49 2.31 1.55 1.27 0.47 0.49
10B 1.78 1.24 0.63 1.01 0.35 0.41
11B 2.20 0.99 0.51 1.12 0.39 0.44
12B 1.65 0.92 0.54 1.04 0.37 0.4
14B 1.94 0.60 0.46 0.37 0.4 0.08
15B 1.80 0.80 0.42 1.12 0.41 0.42

Results of TOC and Rock-Eval Pyrolysis of the studied samples.

Sample ID Depth (m) SOM (ppm) TOC S1 S2 S3 Tmax Calc. %Ro GP (S1 + S2) HI OI SOM/TOC S1/TOC PI
S1 1240 676.12 1.14 0.13 1.11 2.23 423 0.45 1.24 97 196 59.31 11 0.10
S2 1340 2004.31 1.01 0.16 1.02 2.36 422 0.44 1.18 101 234 198.45 16 0.14
S3 1410 ND 1.19 0.16 1.31 2.78 425 0.49 1.47 110 234 ND 13 0.11
S4 1480 1417.71 1.41 0.19 1.93 2.55 428 0.54 2.12 137 181 100.55 13 0.09
S5 1560 ND 0.96 0.15 1.15 2.51 429 0.56 1.3 120 262 ND 16 0.12
S6 1620 2456.23 0.97 0.15 1.26 1.96 429 0.56 1.41 131 203 43.03 16 0.11
S7 1700 2883.85 1.02 0.21 1.66 2.79 427 0.53 1.87 163 274 13.04 21 0.11
S8 1760 1835.19 1.47 0.25 2.60 2.39 430 0.58 2.85 177 163 15.28 17 0.09
S9 1830 1599.37 1.94 0.34 5.84 2.51 426 0.51 6.18 301 129 11.96 18 0.06
S10 1906 1205.55 2.63 0.93 8.24 2.53 427 0.53 9.17 313 96 6.13 35 0.10
S11 1965 2698.84 1.91 1.00 4.11 2.51 431 0.60 5.11 215 131 23.64 52 0.20
S12 2040 1826.01 2.03 0.95 2.99 3.29 425 0.49 3.94 147 162 6.28 47 0.24
S13 2118 ND 1.18 0.39 2.94 2.30 429 0.56 3.33 249 195 ND 33 0.12
S14 2180 2143.91 1.15 0.63 3.25 2.79 422 0.44 3.88 283 243 186.43 55 0.16
S15 2257.5 1978.45 8.92 1.35 43.18 3.15 426 0.51 44.53 484 35 22.18 15 0.03

Source and depositional environment parameters computed from the saturate biomarkers of the EE-1 well.

Sample ID %C27 Sterane %C28 Sterane %C29 Sterane C21T/C23T C23T/C24T Hop/Ster dia/reg Ole/Hop Gam/Hop C24 Tet/(C26 (S+R) + C24 Tet) C25/C26 (S+R) C35/C31-C35Hom
1B 33.50% 19.68% 46.82% 0.58 1.49 4.13 0.18 0.1 0.08 0.52 0.69 0.06
2B 34.79% 22.11% 43.10% 0.8 1.59 2.99 0.15 0.11 0.1 0.49 0.54 0.14
4B 27.36% 19.31% 53.33% 0.49 1.33 1.98 0.28 0.62 0.04 0.6 0.48 0.05
6B 33.10% 20.73% 46.18% 0.82 1.66 1.62 0.21 0.42 0.05 0.62 0.89 0.05
7B 33.35% 20.97% 45.68% 0.78 1.39 3.65 0.27 0.29 0.04 0.67 0.48 0.05
8B 36.81% 21.02% 42.17% 0.62 1.73 4.1 0.23 0.33 0.04 0.64 0.41 0.05
9B 36.85% 25.19% 37.96% 0.55 1.98 1.53 0.13 0.21 0.04 0.6 0.44 0.07
10B 40.18% 25.85% 33.97% 0.33 3.45 6.04 0.33 0.07 0.04 0.52 0.69 0.09
11B 38.09% 24.36% 37.55% 0.39 3.1 11.45 0.42 0.04 0.03 0.72 0.67 0.06
12B 38.86% 27.19% 33.95% 0.36 2.57 16.11 0.48 0.06 0.04 0.45 0.67 0.09
14B 36.49% 23.80% 39.71% 0.46 1.91 6.27 0.35 0.14 0.06 0.5 0.56 0.11
15B 37.53% 41.63% 45.42% 0.37 1.92 6.91 0.38 0.08 0.09 0.45 0.63 0.17

Biomarker maturity parameters computed for the studied well samples.

Sample ID Ts /Tm Mor / Hop αββ/αββ+ααα C29 Sterane 22S/22S+22R MPI-1 DMN TMN-1 MDBT
1B 0.22 0.26 0.28 0.37 1.72 3.56 0.89 2.98
2B 0.25 0.26 0.25 0.34 1.46 2.96 0.73 3.35
4B 0.35 0.48 0.06 0.40 1.75 4.19 0.91 2.83
6B 0.32 0.29 0.21 0.38 1.37 4.04 1.13 3.11
7B 0.27 0.22 0.24 0.42 1.41 3.53 0.97 6.21
8B 0.34 0.18 0.23 0.46 1.35 2.25 1.06 1.81
9B 0.32 0.16 0.18 0.48 1.48 3.74 1.05 1.98
10B 0.35 0.14 0.30 0.57 1.12 3.01 1.17 0.82
11B 0.48 0.13 0.34 0.60 1.16 3.33 0.79 1.07
12B 0.50 0.11 0.44 0.58 1.01 3.25 0.67 1.51
14B 0.44 0.14 0.35 0.58 1.28 4.96 1.11 2.19
15B 0.45 0.10 0.42 0.59 1.32 4.36 0.79 1.47
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