N. G. Obaje, M. K. Musa, A. N. Odoma2, and H. Hamza
The sedimentary succession in the Bida Basin, central Nigeria, has the potential to include an active petroleum system with the generation, migration and accumulation of hydrocarbons in commercial quantities. Hydrocarbon seepages have been reported in the basin around Pategi/Muregi on the River Niger in Niger State and around Ahoko near Lokoja in Kogi State. Field sedimentological evaluation in four localities, namely, Lokoja, Agbaja, Ahoko, and Abaji, indicates braided - fluvial depositional facies for the Lokoja Formation; fluvial - flood plain–marine (shelf) facies for the Patti Formation and marginal marine–fluvial channels for the Agbaja Formation. Geochemical investigations show that potential source rocks in the Bida Basin are gas-prone. Potential reservoir units occur in the fluvial sandstones of the Lokoja Formation and in the shelf and flood plain sandstones of the Patti Formation. The shales and claystones of the Patti and Agbaja Formations may provide regional seals. Different trap configurations are possible in the basin, ranging from traps within uplifted blocks, traps in drapes and/or compacted structures over deep horsts to stratigraphic traps along flanks of uplifted blocks. Cross-sections indicate that the area around Bida, and to the south of Bida around Pategi, Muregi, Baro, Agbaja, Ahoko, Abaji, Gada Biyu, are particularly prospective.
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