Earth and Planetary Science

Fault Seal Integrity Assessment of the Bornu Basin Using Advanced Software Techniques

Chekwube Nnamdi Didi

Petroleum Geoscience Program, Pan African University Institute of Life and Earth Sciences (Including Health and Agriculture), University of Ibadan, Ibadan 200005, Nigeria

DOI: https://doi.org/10.36956/eps.v4i2.2752

Received: 10 August 2025 | Revised: 17 September 2025 | Accepted: 20 September 2025 | Published Online: 2 October 2025

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Abstract

The Bornu Basin, located in northeastern Nigeria, is a sub-basin of the larger Chad Basin and has long been considered a prospective area for hydrocarbon exploration. Despite the presence of quality source rocks, favorable reservoir properties, and structural traps, exploration efforts have largely resulted in dry wells. This study investigates the fault seal integrity of the Bornu Basin as a potential explanation for this paradox. Using 3D seismic data and well logs from the Bulte-1 well, fault seal analysis was conducted with Move and Petrel software (2018 versions). Key techniques included the interpretation of fault geometries, stratigraphic modeling, and quantitative analyses such as Shale Gouge Ratio (SGR), Shale Smear Factor (SSF), Probabilistic SSF, Clay Smear Potential (CSP), and Hydrocarbon Column Height (HCCH) estimations. The F13 fault was identified as a regional structure of interest, and detailed analyses revealed heterogeneous sealing behavior along its plane. Results show that while some intervals demonstrate high sealing potential (high SGR and low permeability), other segments, particularly at greater depths, exhibit high fault throw, low smear continuity, and high leakage risk. These findings suggest that fault-related leakage and early hydrocarbon migration, possibly induced by tectonic or magmatic activity, are key factors limiting successful hydrocarbon entrapment in the basin. The study concludes that fault seal integrity is a critical risk factor in the Bornu Basin, and integrating advanced fault modeling into exploration workflows is essential for future prospect evaluation.

Keywords: Bornu Basin; Fault Seal Integrity; Hydrocarbon Exploration; Shale Gouge Ratio (SGR); Move Software; Structural Trap Leakage

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References

[1] Adepelumi, A.A., Falebita, D.E., Olorunfemi, A.O., et al., 2010. Source-Rock Investigation of the Turonian–Maastrichtian Fika Shale From Wireline Logs, Chad Basin, Nigeria. International Journal of Petroleum Science and Technology. 4(1), 19–42.

[2] Olugbemiro, O.R., 1997. Hydrocarbon Potential, Maturation and Palaeoenvironments of the Cretaceous (Cenomanian to Santonian) Series in the Bornu (Chad) Basin, Northeastern Nigeria. Tuebinger Mikropalaeontologische Mitteilungen. 14, 150. (in German)

[3] Olugbemiro, R.O., Ligouis, B., Abaa, S.I., 1997. The Cretaceous Series in the Chad Basin, Northeastern Nigeria: Source Rock Potential and Thermal Maturity. Journal of Petroleum Geology. 20(1), 51–68.

[4] Alalade, B., Tyson, R.V., 2010. Hydrocarbon Potential of the Late Cretaceous Gongila and Fika Formations, Bornu (Chad) Basin, Northeastern Nigeria. Journal of Petroleum Geology. 33(4), 339–353.

[5] Okeke, S., Khitev, Y., Akpunonu, E., et al., 2025. Integrated Environmental Risk Assessment and Climate Resilience Framework for Water-Saturated Reservoirs: A Petrophysical Approach with Cross-Continental Applications. E3S Web of Conferences. 682, 02005. DOI: https://doi.org/10.1051/e3sconf/202568202005

[6] Okosun, E.A., 2000. Preliminary Assessment of the Petroleum Potentials From Southwest Chad Basin, Nigeria. Borno Journal of Geology. 2(2), 40–50.

[7] Okpikoro, F.E., Olorunniwo, M., 2010. Seismic Sequence Architecture and Structural Analysis of Northeastern Nigeria Chad (Bornu) Basin. Continental Journal of Earth Sciences. 5(2), 1–9.

[8] Mohammed, A.Y., Pearson, M.J., Ashcroft, W.A., et al., 1999. Modeling Petroleum Generation in the Southern Muglad Rift Basin, Sudan. Bulletin of the American Association of Petroleum Geologists. 83, 1943–1964.

[9] Adekoya, J.A., Ola, P., Olabode, S., 2014. Possible Bornu Basin Hydrocarbon Habitat: A Review. International Journal of Geosciences. 5(9), 983–996.

[10] Moumouni, A., Obaje, N., Nzegbuna, A.I., et al., 2007. Bulk Geochemical Parameters and Biomarker Characteristics of Organic Matter in Two Wells (Gaibu-1 and Kasade-1) from the Bornu Basin: Implications on the Hydrocarbon Potential. Journal of Petroleum Science and Engineering. 58(3–4), 275–282.

[11] Sunday, O., Adeyinka, A., Ojo, O.S., 2017. Source Rock Evaluation in the Lake Chad Area of the Bornu Basin, Nigeria. Journal of Petroleum and Environmental Biotechnology. 8(1), 1–9.

[12] Didi, C.N., Osinowo, O.O., Akpunonu, O.E., et al., 2025. Multi-Disciplinary Approach to Evaluate Hydrocarbon Potential in the Bornu Basin, Northeastern Nigeria. Journal of African Earth Sciences. 230, 105742. DOI: https://doi.org/10.1016/j.jafrearsci.2025.105742

[13] Uzoma, P.T., Booth, J., Uzoma, K., et al., 2024. Assessing the Impact of Fault Seal on Hydrocarbon Accumulation: The Result of a Blind Well Test, Onshore Niger Delta. In Proceedings of the SPE Nigeria Annual International Conference and Exhibition, Lagos, Nigeria, 5–7 August 2024. DOI: https://doi.org/10.2118/221652-MS

[14] Ahmed, K., Liu, K., Moussa, H., et al., 2022. Assessment of Petroleum System Elements and Migration Pattern of Borno (Chad) Basin, Northeastern Nigeria. Journal of Petroleum Science and Engineering. 208, 109505. DOI: https://doi.org/10.1016/j.petrol.2021.109505

[15] Genik, G.J., 1991. Petroleum Geology of Rift Basins in Niger, Chad, and the Central African Republic. Bulletin of the American Association of Petroleum Geologists. 75, 1405–1434.

[16] Genik, G.J., 1992. Regional Framework, Structural and Petroleum Aspects of Rift Basins in Niger, Chad and the Central African Republic. Tectonophysics. 213, 169–185.

[17] Didi, C.N., Obiadi, I.I., Okeke, S.E., et al., 2020. Structural Architecture of Chad (Bornu) Basin Using 3-D Seismic Data. IOSR Journal of Applied Geology and Geophysics. 8(4), 42–55.

[18] Adepelumi, A., Alao, O., Ako, B., et al., 2012. Modeling of Hydrocarbon Potential and Thermal Maturity of Gongila Shale, Chad Basin, Northeastern Nigeria. Oil Shale. 29(2), 151.

[19] Fairhead, J.D., 1986. Geophysical Controls on Sedimentation within the African Rift Systems. Geological Society of London Special Publications. 25, 19–27.

[20] Binks, R.M., Fairhead, J.D., 1992. A Plate Tectonic Setting for Mesozoic Rifts of West and Central Africa. Tectonophysics. 213, 141–151.

[21] Fairhead, J.D., Green, C.M., 1989. Controls on Rifting in Africa and the Regional Tectonic Model for the Nigeria and Niger Rift Basins. Journal of African Earth Sciences. 8, 231–249.

[22] Burke, K.C., 1969. Seismic Areas of the Guinea Coast Where Atlantic Fracture Zones Reach Africa. Nature. 222, 655–677.

[23] Avbovbo, A.A., Ayoola, E.O., Osahon, G.A., 1986. Depositional and Structural Styles in Chad Basin of Northeastern Nigeria. Bulletin of the American Association of Petroleum Geologists. 70, 1787–1798.

[24] Isyaku, A., Rust, D., Teeuw, R., et al., 2014. Remote Sensing and Geosciences Interpretation of Lineaments for Tectonic and Hydrocarbon Studies in the Bornu Basin. In Proceedings of the Third EAGE Exploration Workshop, Abu Dhabi, United Arab Emirates, 6–9 April 2014. DOI: https://doi.org/10.3997/2214-4609.20140059

[25] Guiraud, R., Maurin, J.-C., 1992. Early Cretaceous Rifts of Western and Central Africa: An Overview. Tectonophysics. 213(1–2), 153–168.

[26] Yusuf, S.N., Yenne, E.Y., Faruk, M.U., 2026. Basement Architecture and Structural Styles of Part of the Nigerian Sector of the Chad Basin (Bornu Basin). Journal of African Earth Sciences. 235, 105979. DOI: https://doi.org/10.1016/j.jafrearsci.2025.105979

[27] Sanusi, Y.A., Likkason, O., 2015. Delineation of Deep-Seated Structural Features Beneath Western Parts of Bornu Basin and Its Adjoining Areas Using Aeromagnetic Data. Nigerian Journal of Physics. 26(1), 34–48.

[28] Zaborski, P., Ugodulunwa, F., Idornigie, A., et al., 1997. Stratigraphy and Structure of the Cretaceous Gongola Basin, Northeastern Nigeria. Bulletin des Centres de Recherches Exploration-Production Elf-Aquitaine. 21, 153–185.

[29] Boboye, O., Akaegbobi, I., 2012. Sedimentological and Palyno-Environmental Appraisal of the Late Quaternary Sediments, Northeastern Bornu Basin. Quaternary International. 262(7), 14–19.

[30] Adeigbe, O.C., Abimbola, A.F., 2013. The Cretaceous–Tertiary Clastic Rocks Weathering Indices: A Case Study of Maastrichtian–Paleocene Rock Succession, Bornu Basin, Northeastern Nigeria. International Journal of Engineering Sciences and Research Technology. 2(2), 122–130.

[31] Adegoke, A.K., Abdullah, W.H., Hakimi, M.H., et al., 2014. Geochemical Characterisation of Fika Formation in the Chad (Bornu) Basin, Northeastern Nigeria: Implications for Depositional Environment and Tectonic Setting. Applied Geochemistry. 43, 1–12.

[32] Adewumi, T., Salako, A.K., Muztaza, N.M., et al., 2022. Mapping of Subsurface Geological Structures and Depth to the Top of Magnetic Basement in Bornu Basin and Its Environs, Northeastern Nigeria. Arabian Journal of Geosciences. 15(18), 1521. DOI: https://doi.org/10.1007/s12517-022-10818-8

[33] Carter, J.D., Barber, W., Tait, E.A., et al., 1963. The Geology of Parts of Adamawa, Bauchi and Bornu Provinces in Northeastern Nigeria. Bulletin of the Geological Survey of Nigeria. 30, 1–108.

[34] Mohammed, Y., Wulo, I.B., Abdullahi, J., et al., 2019. Geomorphometric and Terrain Analysis of the Nigerian Section of the Chad Basin (Bornu Basin), Northeastern Nigeria. Journal of Geography and Geology. 11(4), 1.

[35] Hamza, H., Hamidu, I., 2012. Hydrocarbon Resource Potential of the Bornu Basin, Northeastern Nigeria. Global Journal of Geological Sciences. 10(1), 71–84.

[36] Ekwok, E., Achadu, M., Ugar, I., et al., 2023. Appraisal of the Magnetic and Geothermal Anomalies of Bornu Basin, Northeastern Nigeria Involving Aeromagnetic Data. Global Journal of Geological Sciences. 21(1), 117–128. DOI: https://doi.org/10.4314/gjgs.v21i1.8

[37] Popoff, M., Benkhelil, J., Simon, B., et al., 1983. Geodynamic Approach to the Benue Trough (Nigeria) Based on Field Data and Remote Sensing. Bulletin des Centres de Recherches Exploration-Production Elf-Aquitaine. 7, 323–337. (in French)

[38] Cratchley, C.R., Jones, P.E., Ajakaiye, D.E., 1984. Geophysical and Geological Evidence for the Benue–Chad Basin Rift System. Journal of African Earth Sciences. 2(2), 141–150.

[39] Benkhelil, J., 1988. Structure and Geodynamic Evolution of the Intracontinental Benue Basin, Nigeria. Bulletin des Centres de Recherches Exploration-Production Elf-Aquitaine. 2(1), 29–128. (in French)

[40] Genik, G.J., 1993. Petroleum Geology of Cretaceous to Tertiary Rift Basins in Niger, Chad and the Central African Republic. Bulletin of the American Association of Petroleum Geologists. 77, 1405–1434.

[41] Suleiman, A.A., Magee, C., Jackson, C.A.L., et al., 2017. Igneous Activity in the Bornu Basin, Onshore Northeastern Nigeria: Implications for Opening of the South Atlantic. Journal of the Geological Society. 174, 667–678. DOI: https://doi.org/10.1144/jgs2016-107

[42] Fisher, Q.J., Knipe, R.J., 2001. The Permeability of Faults Within Siliciclastic Petroleum Reservoirs of the North Sea and Norwegian Continental Shelf. Marine and Petroleum Geology. 18(10), 1063–1081.

[43] Childs, C., Manzocchi, T., Walsh, J.J., et al., 1997. Geometric Controls on Fault Zone Flow Conduits and Barriers. Bulletin of the American Association of Petroleum Geologists. 81(10), 1794–1809.

[44] Yielding, G., Freeman, B., Needham, D.T., 1997. Quantitative Fault Seal Prediction. Bulletin of the American Association of Petroleum Geologists. 81(6), 897–917.

[45] Oluwadare, O.A., Ayefohanne, P.H., 2025. Integration of Artificial Neural Network and Move Fault Analysis Model for Predicting Fault Seals: A Case Study in “Swan” Field, Niger Delta Basin. Arabian Journal of Geosciences. 18, 181. DOI: https://doi.org/10.1007/s12517-025-12312-3

[46] Lindsay, N.G., Murphy, F.C., Walsh, J.J., et al., 1993. Outcrop Studies of Shale Smear on Fault Surfaces. Geological Society of London Special Publications. 70(1), 113–123.

[47] Knipe, R.J., Jones, G., Fisher, Q.J., 2004. Faulting, Fault Sealing and Fluid Flow in Hydrocarbon Reservoirs: An Introduction. Geological Society of London Special Publications. 147, 1–6.

[48] Allan, U.S., 1989. Model for Hydrocarbon Migration and Entrapment Within Faulted Structures. Bulletin of the American Association of Petroleum Geologists. 73(7), 803–811.

[49] Hu, X., Lv, Y., Liu, Y., et al., 2023. Quantitative Study of the Lateral Sealing Ability of Faults Considering the Diagenesis Degree of the Fault Rock: An Example from the Nantun Formation in the Wuerxun-Beier Sag in the Hailar Basin, China. Resources. 12(9), 98. DOI: https://doi.org/10.3390/resources12090098

[50] Zhu, W., Gong, J., 2016. Fault Sealing Evaluation and Hydrocarbon Migration Prediction: A Case Study From Bohai Bay Basin, China. Marine and Petroleum Geology. 77, 275–289.

[51] Watts, N.L., 1987. Theoretical Aspects of Cap-Rock and Fault Seals for Single- and Two-Phase Hydrocarbon Columns. Marine and Petroleum Geology. 4(4), 274–307.

[52] Caillet, G., 1993. Fault Seal Analysis in the Sirte Basin (Libya): A Tool for Risk Evaluation. Petroleum Geoscience. 1, 39–48.

[53] Schlumberger, 1989. Log Interpretation Charts, 4th ed. Schlumberger Wireline and Testing: Houston, TX, USA.

[54] Corredor, F., Shaw, J.H., Bilotti, F., 2005. Structural Styles in the Deep-Water Fold and Thrust Belts of the Niger Delta. Bulletin of the American Association of Petroleum Geologists. 89(6), 753–780.

[55] Evamy, B.D., Haremboure, J., Kamerling, P., et al., 1978. Hydrocarbon Habitat of Tertiary Niger Delta. Bulletin of the American Association of Petroleum Geologists. 62(1), 1–39.

[56] Chukwuemeka, E.V., Ogbamikhumi, A., Salami, S.A., et al., 2025. Structural Evaluation and Hydrocarbon Potentials of Emil Field, Offshore Niger Delta Basin. Results in Earth Sciences. 3, 100142. DOI: https://doi.org/10.1016/j.rines.2025.100142

[57] Weber, K.J., Daukoru, E.M., 1975. Petroleum Geology of the Niger Delta. Proceedings of the 9th World Petroleum Congress. 2, 209–221.

[58] Ding, W., Liu, T., Cao, Z., et al., 2024. Current Research Status and Development Trends of Fault Sealing. Petroleum Geology and Experiment. 46(4), 641–656. DOI: https://doi.org/10.11781/sysydz202404647 (in Chinese)

[59] Didi, C.N., Osinowo, O.O., Akpunonu, O.E., et al., 2025. Reservoir Characterization of Kolmani Field, Northeast Nigeria, Using Well Log Data and 3D Seismic Data for Enhanced Hydrocarbon Prospectivity. Arabian Journal of Geosciences. 18, 161. DOI: https://doi.org/10.1007/s12517-025-12302-5

[60] Ji, J., Wu, K., Pei, Y., et al., 2021. Fault Sealing Evaluation of a Strike-Slip Fault Based on Normal Stress: Eastern Junggar Basin, NW China. Energies. 14(5), 1468.

[61] Amponsah-Dacosta, M., Opuwari, M., Titinchi, S., et al., 2025. Fault Seal Analysis for Geological Carbon Dioxide Storage in the Pletmos Basin, Offshore South Africa. Marine Georesources and Geotechnology. 43(1), 1–15.

[62] Andrews, B.J., Mildon, Z.K., Jackson, C.A.L., et al., 2024. Quantifying Fault Interpretation Uncertainties and Their Impact on Fault Seal and Seismic Hazard Analysis. Journal of Structural Geology. 183, 105158.

[63] Aditama, M.R., Laksono, F.A.T., Fadlin, et al., 2025. Structural Framework and Fault Seal Prediction of the Central Slyne Basin Prospect, Irish Atlantic Margin. Geo-Marine Letters. 45(1), 85–101.

[64] Li, K., Zhang, B., Wu, J., et al., 2025. Comprehensive Evaluation of Fault Sealing for CO₂ Geological Storage. Greenhouse Gases: Science and Technology. e70006. DOI: https://doi.org/10.1002/ghg.70006

[65] El-Qalamoshy, T.R., Abdel-Fattah, M.I., Reda, M., et al., 2023. A Multi-Disciplinary Approach for Trap Identification Including Fault Seal Analysis in the Western Desert of Egypt. Geomechanics and Geophysics for Geo-Energy and Geo-Resources. 9, 157. DOI: https://doi.org/10.1007/s40948-023-00699-w

[66] Michie, E.A.H., Schuller, V., 2024. Fault and Top Seals 2022: A Perspective. Petroleum Geoscience. 30(3), 301–310.

[67] Didi, C.N., Osinowo, O.O., Akpunonu, O.E., 2025. Structural Interpretation and Sequence Stratigraphy of Kolmani Field, Northeast Nigeria, Using 3D Seismic Data and Well Log Data for Enhanced Hydrocarbon Prospectivity. Journal of Sedimentary Environments. 10, 893–923. DOI: https://doi.org/10.1007/s43217-025-00249-2

[68] Bönke, W., Alaei, B., Torabi, A., 2024. Data Augmentation for 3D Seismic Fault Interpretation Using Deep Learning. Marine and Petroleum Geology. 162, 106706. DOI: https://doi.org/10.1016/j.marpetgeo.2024.106706

[69] Xu, M., Guo, Y., Mao, H., et al., 2025. Experimental Investigation on the Shear Behavior of Different Faults in Depleted Gas Storage Reservoirs. Applied Sciences. 15(23), 12489. DOI: https://doi.org/10.3390/app152312489

[70] Jiang, M., Jin, Y., Hu, Z., et al., 2025. Prediction and Evaluation of Fault Lateral Sealing Ability: A New Approach to Integrating Comprehensive Controlling Factors Based on BP Neural Network. Journal of Earth Science. 1–18.

[71] Fisher, Q., Kaminskaite, I., del Pino Sanchez, A., 2023. Shale Barrier Performance in Petroleum Systems: Implications for CO2 Storage and Nuclear Waste Disposal. Geoenergy. 1(1), geoenergy2023-006. DOI: https://doi.org/10.1144/geoenergy2023-006

[72] Holden, N., Osmond, J.L., Mulrooney, M.J., et al., 2022. Structural Characterization and Across-Fault Seal Assessment of the Aurora CO2 Storage Site, Northern North Sea. Petroleum Geoscience. 28(4), petgeo2022-036. DOI: https://doi.org/10.1144/petgeo2022-036

[73] Wu, L., Thorsen, R., Ottesen, S., et al., 2021. Significance of Fault Seal in Assessing CO2 Storage Capacity and Containment Risks—An Example From the Horda Platform, Northern North Sea. Petroleum Geoscience. 27(3), petgeo2020-102. DOI: https://doi.org/10.1144/petgeo2020-102