Subsidence and evolution of Nigeria's continental margin: implications of data from Afowo-1 well |
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| Institution: | 1. Department of Earth Sciences, Uppsala University, Uppsala, Sweden;2. Department of Geology, Salahaddin University, Erbil, Kurdistan Region, Iraq;1. Institute of Geophysics, ETH, Sonneggstr. 5, 8092 Zurich, Switzerland;2. Uppsala University, Department of Earth Sciences, Villavägen 16 B, 752 36 Uppsala, Sweden;3. Institute of Environmental Engineering, Wolfgang-Pauli-Str. 15, 8093 Zürich, Switzerland;4. Institute for Geoscience, Aarhus University, C F Moellers Allé 4, DK-8000 Aarhus C, Denmark;5. Department of Geological Survey, Private Bag 14, Lobatse, Botswana;6. Department of Geology, University of Botswana, Private Bag UB00704, Gaborone, Botswana;1. Key Laboratory of Geo-detection, China University of Geosciences, Beijing, Ministry of Education, Beijing, 100083, China;2. School of Geophysics and Information Technology, China University of Geosciences, Beijing, 100083, China;3. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing, 100083, China |
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| Abstract: | The Afowo-1 well is situated west of Lagos on the onshore part of the Dahomey basin. Biostratigraphic data from this exploratory well have been used to determine the subsidence history of the western part of the Nigerian continental margin. The formation of the Dahomey basin is associated with rifting and break-up of the African and South American plates. Lithospheric cooling and contraction probably produced post break-up subsidence of the basin. This concept of a thermally controlled isostatic subsidence is supported by reconstructed subsidence curves. After the component of subsidence due to sediment loading has been removed, it is found that the tectonic subsidence yt varies directly as √t, where t is the time since subsidence began.The time/temperature/depth relations for sediments in this part of the Nigerian continental margin have been reconstructed from the subsidence and palaeotemperature data. The results clearly indicate that most post-Turonian sediments have hardly been subjected to temperatures higher than 75°C at any time. Insight into the level of maturation of the organic matter contained in the sediments has been provided by the extent of ‘cooking’ to which these sediments have been subjected. The hydrocarbon prospects of this part of the Nigerian continental margin are poor. |
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