Calcareous Nannofossil Biostratigraphy Studies of IZA-1 Well, Offshore Depobelt, Niger Delta

Authors

  • Shima Amashegh Department of Earth Sciences, Federal University of Petroleum Resources, Effurun, Nigeria
  • Aladin Anthony Ese Department of Geology, University of Benin, Benin City, Edo State, Nigeria

Keywords:

Zonation, Nannofossil, Calcareous, Biostratigraphic, Chronostratigraphic

Abstract

Calcareous nannofossil biostratigraphic analysis was conducted on 20 ditch cutting samples from the IZA-1 well, located in the offshore deep-water area of the Niger Delta. The study employed the pipette strew preparation method to establish nannofossil biozonation and determine the age of the study intervals. Lithologically, the examined sequences consist of grey shales, siltstones, and mudstones, with intercalations of thin-bedded sandstones. The analysis revealed a moderately diverse assemblage of calcareous nannofossils. Nannofossil zones were identified based on the first and last occurrences of easily recognizable marker species and their relative abundances. These zones facilitated the age determination of the sequences, which range from the Early Miocene to the Middle Miocene. Key marker species and diagnostic assemblages, including Sphenolithus abies, Sphenolithus heteromorphus and Discoaster drugii, were used to assign ages from NN5 to NN3, according to the classic zonation scheme of Martini (1971).

Author Biography

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2025-04-30

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