Article Details : |
| | Article Name : | | Late Eocene—Early Oligocene Foraminiferal
Biostratigraphy and Paleoenvironment of
Sediments from Beta- 24 Well Niger Delta Basin,
South Eastern Nigeria | Author Name : | | UKPONG, ANIEDIOBONG JONAH, ANYANWU, TIMOTHY CHIBUIKE
| Publisher : | | Bridge Center | Article URL : | | | Abstract : | | Foraminiferal and lithological analyses of ditch cutting
samples and well logs from depth interval 2008 – 3396 meters in Beta24 well in the Niger Delta basin of Nigeria was carried out in order to
determine the biostratigraphy and paleoenvironment of the sequences
penetrated by the well. Standard foraminiferal sample preparation
method which involved sample disaggregation and washing through a
63 micron mesh sieve, drying and picking of the foraminifera and
accessory fauna were employed. The result showed that the well
penetrated the alternating sand and shale sequences of the Agbada
Formation. A Late Eocene to Early Oligocene age was assigned to the
well section based on the presence of some characteristic Late Eocene to
Early Oligocene foraminifera assemblages of the Niger Delta such as
Bolivina tenuicostata, Bolivina imperatrix, Bolivina ihuoensis and
Globigerina ampliapertura. The P16/17 and P16/17 – P18/19
foraminiferal biozones were erected for the studied interval of the well.
The P16/17 foraminiferal biozone was delineated on the basis of the
Last Downhole Occurrence (LDO) of Globigerina ampliapertura at
2928m and the First Downhole Occurrence (FDO) of Bolivina
ihuoensis at 2768m while the top of the P16/17-P18/19 zone was tentatively defined at 2248m based on the occurrences of Bolivina
tenuicostata and Bolivina imperatrix and the base was placed at
2648m on account of the LDO of Bolivina imperatrix.
Paleoenvironmental interpretation based on the foraminiferal
assemblages recovered revealed that the lithologic units were deposited
within the non-marine through shallow inner neritic, inner neritic,
middle neritic to outer neritic environments. | Keywords : | | Foraminifera, Eocene, Oligocene, Neritic,
Biostratigraphy, Paleoenvironment, Niger Delta.
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