Abstract
Foraminiferal analysis was carried out on twenty five (25) ditch cutting samples from well -AA, offsore Niger Delta covering a depth interval of 9000ft-11025f. The study was aimed at age deduction, zoning the well, and interpreting the paleoenvironment of deposition. Lithostratigraphic description carried out on the sample revealed that the bulk lithofacies constitute shale with streaks of sand (fine-medium) between 9170ft - 9210ft and 9360ft -9380ft. The entire analysed interval was barren of planktonic foraminifera while depth 9960ft revealed a spot occurrence of Lagena spp,representing the only calcareous benthic foraminifera recovered in the entire interval. Few to common occurrences of deepwater agglutinated foraminifera were found in the well, dominated by some species of Haplophragmoides spp and Haplophragmoides narivaensis. Other foraminifera with rare and scattered occurrence includes, Cribrostomides spp, Bathysiphon spp, Troahammina spp, Cyclammina spp, Cyclammina cancellata, Valvulina spp, and Glomospira spp. The only microfaunal associated accessory recovered is ostracod at depth 1080ft. The analysed intervals was assigned a Middle – Late Miocene (N17 and older age) based on the FDO of Haplophragmoides narivaensis. The environment of deposition is based on the distribution of typical deep water arenaeceous foraminifera species recovered in the study. The predominance of the arenaeceous forms over calcareous forms suggest outer shelf environment of deposition.
 Keywords: Foraminifera, Palaeoenvironment, Niger delta, Biostratigraphy.
Highlights
The Niger Delta is an important sedimentary basin with oil and gas fields in Nigeria
The Niger Delta basin contains one recognized petroleum system the Akata-Agbada Petroleum System with numerous exploratory wells (Ekweozor and Daukoru, 1994; Kulke,1995).The relatively large amount of data obtained from several researchers (Ozumba, 1995; Fadiya, 1999; Bassey and Alalade, 2005; Umoh et al, 2011; Omoboriowo et al, 2011, Oloto and Promise, 2014; Fadiya et al, 2014; Umoh, 2015; Boboye et al, 2017; Ifeoluwadun and Saka, 2018) in the Niger delta has led to a better understanding of the subsurface formations that characterise the basin and more quest to the discovery of oil and gas in the region
MATERIALS AND METHODS Twenty-five (25) ditch cutting samples from well AA, Offshore Niger Delta, at depth interval of 9000ft- 11025ft and Gamma ray log data were provided by Shell Petroleum Company, Nigeria
Summary
The Niger Delta is an important sedimentary basin with oil and gas fields in Nigeria. The Niger Delta basin contains one recognized petroleum system the Akata-Agbada Petroleum System with numerous exploratory wells (Ekweozor and Daukoru, 1994; Kulke,1995).The relatively large amount of data obtained from several researchers (Ozumba, 1995; Fadiya, 1999; Bassey and Alalade, 2005; Umoh et al, 2011; Omoboriowo et al, 2011, Oloto and Promise, 2014; Fadiya et al, 2014; Umoh, 2015; Boboye et al, 2017; Ifeoluwadun and Saka, 2018) in the Niger delta has led to a better understanding of the subsurface formations that characterise the basin and more quest to the discovery of oil and gas in the region. The study area lies within the Niger Delta between Longitudes 3oE and 9oE and Latitudes 4oN and 5o2’N. The study well –AA, is an offshore well belonging to the OML 118 block
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