European Academic Research ISSN 2286-4822
ISSN-L 2286-4822
Impact Factor: 3.4546 (UIF)
DRJI Value : 5.9 (B+)
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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