Palynological Study of Vida-1 Well, Central Niger Delta Basin, Nigeria
Keywords:Palynomorphs, Environment, Marine, Zone, Assemblages, Age, Terrestrial
Palynological examination of forty (40) microscopic slides prepared from direct specimen of Agbada Formation core samples between (6,963ft – 9,866 ft), were carried out with a view to determining the age and paleoenviroment of deposition. Standard palynological procedure was followed and the slides yielded excellent to well preserved distribution of miospore assemblages. Diagnosis uncovered one hundred and twenty-three (123) miospores. Delineation of the well section produced four palynological zones based on stratigraphic distribution. Crassoretitriletes vanraadshooveni/P700 Zone characterized by the quantitative base occurrence of Crassoretitriletes vanraadshooveni and co-occurrence of Belskipollis elegans, Crassoretitriletes vanraadshooveni, Pachydermites diederix, Gemmastephanocolporites sp., Echiperiporites estalae, Verrutricolporites rotundiporus and Stephanoporites echinatus. Magnastriatites howardii/P600 Zone characterized by quantitative base occurrence of Praedapollis flexibilis and co-occurrence of Magnastriatites howardii, Peregrinipollis nigericus, Praedapollis flexibilis Spirosyncolpites brunni, Verrucatosporites usmensis, Retitricolporites irregularis. Verrucatosporites usmensis /P500 Zone characterized by the co-occurrence of Arecipites exilimuratus, Verrucatosporites usmensis and Gemmamonoporites sp. Verrucatosporites usmensis /P400 Zone characterized by the quantitative base occurrence of Verrucatosporites usmensis and co-occurrences of Psilatricolporites crassus, Pachydermites diederix and Monoporites annulatus. Paleoecological grouping of the recovered palynomorphs assemblages revealed the presence of mangrove, freshwater swamp, coastal. riverine and savana vegetation types. However, the assemblages retrieved are dominated by terrestrially derived palynomorphs, such as spores (ferns and fungi) and pollens alongside depicting the brackish to freshwater colonial algae, marine indicator palynomorphs, including dinoflagellate cysts and foraminiferal linings, which were relatively low, indicating paralic environment with the shaly sediments being deposited in a marginally marine environment under a terrestrial influence. The palynofloral assemblage within this interval suggests deposition in environments fluctuating between marine and nearshore. The interval in the well section is dated Late Eocene - Middle Miocene.
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