Abstract
A calcareous nannofossils biostratigraphic study has been carried out on the strata penetrated of well 02 located in the shallow offshore area of the Niger Delta, Nigeria. The study is aimed at establishing the age and nannofossils biozonations of the well. The samples were prepared using smear slide technique. Forty calcareous nannofossils species were identified and used to make biostratigraphic deductions of zonations and dating of the sequence.The distribution of the calcareous nannofossils enabled the establishment of three zones of Helicosphaera ampliaperta (NN4),Sphenolithus heteromorphus (NN5) and Catinaster coalitus (NN8) belonging to early Miocene - late Miocene following standard zonation schemes of previous workers. The zones were based on the first and last occurrences of marker species. Nannofossil abundance / diversity patterns calibrated with chronostratigraphical bioevents reveals four condensed sections when correlated to the Global Cycle Chart. This is associated with the 16.0 Ma, 14.8 Ma and 13.4 Ma and 10.89 Ma maximum flooding surfaces.
Highlights
This study focuses on the nannofossils Biostratigraphy of well-02, located on the shallow offshore portion of the Niger Delta. (Fig. 1) The aim of the study is to present biostratigraphic information from the nannofossils recovered from the strata penetrated
One hundred and twelve ditch cutting samples obtained at 30 ft interval within the range of 6000 -11000 ft from well 02 located in the shallow offshore Niger Delta was utilized for this study
The well is code named well 02 for confidential reasons and the sample were provided by one of the multinational oil companies operating in the Niger Delta
Summary
This study focuses on the nannofossils Biostratigraphy of well-02, located on the shallow offshore portion of the Niger Delta. (Fig. 1) The aim of the study is to present biostratigraphic information from the nannofossils recovered from the strata penetrated.Calcareous nannofossils are tiny (less than 30 microns) marine phytoplanktons. Tappan, 1980 considers the size of Nannoplankton to be less than 2 μm and referred to those between size range of 2-20 μm as ultramicroplankton. Tappan, 1980 considers the size of Nannoplankton to be less than 2 μm and referred to those between size range of 2-20 μm as ultramicroplankton. They are classified as coccolith and nannolith, Perch- Nielsen, 1985. Coccoliths are disc-shaped plates ,while the nannolith has various shapes including the star- shaped discoasters. They strive in normal marine environments and rarely tolerate turbidity and freshwater environment, Hay et al., Calcareous nannofossils have been studied and reported in several literatures, but not much from the Niger Delta basin
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