FORAMINIFERA AND AGE CHARACTERIZATION OF WLL X, ONSHORE NIGER DELTA, NIGERIA

June 28, 2023
-

FORAMINIFERA AND AGE CHARACTERIZATION OF WLL X, ONSHORE NIGER DELTA, NIGERIA

Tags : Age Biozonation Foraminifera micropaleontology Niger Delta Sedimentology

FORAMINIFERA AND AGE CHARACTERIZATION OF WLL X, ONSHORE NIGER DELTA, NIGERIA

Ajogu, G. E. and Asadu, A.N
Department of Earth Sciences, Federal university of Petroleum Resources Effurun, Nigeria.
Correspondence e-mail: asadu.anthonia@fupre.edu.ng

ABSTRACT

Micropaleontological analysis was carried out on one hundred and ninety-two (192) ditch cutting rock samples from interval, 5480 feet to 11256 feet of well-x, located between Longitude 0 3’47.677″E and latitude 0 2’30.506″N, onshore Niger Delta, The aim of the study was to erect biozonation model of foraminifera and use it to characterize the age of the sediments penetrated by the well section studied. The sedimentological sample investigation involved wet and dry sieve analysis using 63 micrometer mesh size, 250 micrometer mesh size and 500 micrometer mesh size while the micropaleontology samples was prepared through wet sieve analysis with sodium hexametaphosphate as a deflocculant and analyzed for foraminifera following the taxonomic classification of Loeblich and Tappan (2015) method for foraminifera analysis. The sedimentological description of the ditch cutting rock samples provided data for sand / shale ratio, sorting and gradational profile of the study well and show that the sediment under study penetrated the Parallic Agbada Formation. Micropalaeontological analysis result indicated that some intervals yielded a rich recovery of foraminiferal assemblage while other intervals were either completely barren or recorded few occurrences of foraminifera. A total number of Ninety-three (93) well preserved foraminiferal species were identified. Calcareous benthonics accounted for about 35% of the total recovery while the agglutinated benthonics constituted about 42% and the planktonic species made up the remaining 23%. Three biozone (Haplophragmoides sp, Valvulina flexilis / Haplophragmoides compressa and Globigerinoides ruber/ Alveolophragmium crassum) were recognised and compared with, ?N19/20, N18 – N19/20 and N17 of Blow (1979) zonation scheme respectively to assign early Pliocene to Late Miocene age for the rock succession studied.

Keywords: Foraminifera, micropaleontology, Age, Biozonation, Niger Delta, Sedimentology.

View/Print | Download Download full PDF

PALYNOFLORAL BIOSTRATIGRAPHY OF WELL AX, ONSHORE NIGER DELTA, NIGERIA

Tags : Age Biozonation Niger Delta Paleoenvironment Palynology Palynomorph

Category : SJSTRD: Volume 2, Issue 6

PALYNOFLORAL BIOSTRATIGRAPHY OF WELL AX, ONSHORE NIGER DELTA, NIGERIA

Asadu, A.N and Onowaro, V. O.

Department of Earth Sciences, Federal university of Petroleum Resources Effurun, Nigeria.

Correspondence e-mail: asadu.anthonia@fupre.edu.ng

Abstract

The Eighty -eight (88) ditch cutting rock samples from Well AX, between interval 5900 feet and 9000 feet were processed for palynomorphs using standard palynological sample processing procedures for their palynofloral contents for the purpose of establishing their biozonation, age and paleoenvironments. Lithologic description of the ditch cutting rock samples reveal that the sediments are mostly made of sandstone, with minor alterations of shale, mudstone, and siltstone as well as accessory minerals at some horizons. The shale is light grey, unconsolidated, sub fissile to fissile; the sandstone is made up of White to light grey, unconsolidated, well sorted, very fine grained to medium, sub-rounded to sub-angular grains while the mudstone is reddish and unconsolidated. The accessory minerals are pyrite and carbonaceous detritus, characteristically depicting Agbada Formation. Palynological analysis yielded ninety-six (96) well preserved miospores from which three biozones (Belskipollis elegans, Crassoretitriletes vanraadshooveni and Pachydermites diederixi zones were recognised and correlated with P740, P720 and P680 subzones of Evamy et al., 1978, respectively to assign early to middle Miocene age for the sediments. The abundance and diversity of terrestrially derived miospores and rare occurrence of marine derived types guided the interpretation of palaeo-environments in the studied section of the well AX. The sediments revealed fluctuations between continental/marginal marine to near shore/coastal deltaic paleo-environments.

Keywords: Palynomorph, Paleoenvironment, Age, Biozonation, Niger Delta, Palynology.

View/Print | Download Download full PDF

IJAAR is licensed under a Creative Commons Attribution.

Open Access Journals

Our open access publication model provides free, unrestricted access to scholarly research for everyone.

O.A. Database Indexing

Our indexing in databases such as Google Search Engine, Google Scholar, Academia, etc. increases the visibility and accessibility of published scholarly works.

Digital Object Identifier (DOI)

We assign Digital Object Identifier (DOI) to published papers to ensure a permanent, unique, and persistent link to the digital location of the research.

FORAMINIFERA AND AGE CHARACTERIZATION OF WLL X, ONSHORE NIGER DELTA, NIGERIA

-