Late miocene to pleistocene planktonic foraminiferal biostratigraphy and palaeoecology of North Apoi C Well, offshore western Niger Delta, Nigeria

2005 ◽  
Vol 41 (1) ◽  
Author(s):  
CE Bassey ◽  
B Alalade
Keyword(s):  
Late Miocene ◽  
Niger Delta ◽  
Foraminiferal Biostratigraphy

scholarly journals Late Miocene–Early Pliocene planktic foraminiferal biostratigraphy of deep offshore southwestern Niger Delta

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Bamidele Adeniyi Adebambo ◽  
Suyi Lawrence Fadiya
Keyword(s):  
Late Miocene ◽  
Niger Delta ◽  
Early Pliocene ◽  
Foraminiferal Species ◽  
Processing Techniques ◽  
Foraminiferal Biostratigraphy

AbstractThe planktic foraminiferal biostratigraphy of the deep offshore southwestern Niger Delta has been studied from three wells (DPW-1, DPW-2 and DPW-3). A total of 418 ditch cutting samples (104 samples from DPW-1, 165 from DPW-2 and 149 from DPW-3) taken at 18-m intervals were subjected to standard micropaleontological processing techniques. In total, 42, 52 and 40 planktic foraminiferal species were identified from DPW-1, DPW-2 and DPW-3, respectively. The identified planktic species allow the delineation of the studied section into four biozones—Globorotalia acostaensis (N16), Globigerinoides obliquus extremus/Globorotalia merotumida (N17), Globorotalia margaritae primitiva (N18) and Globorotalia margaritae evoluta/Globigerina nepenthes (N19) zones, based on the first appearance datums (FADs), last appearance datums (LADs) of the nominate taxa and associated assemblages. The well sections dated Late Miocene to Early Pliocene based on the occurrence of certain diagnostic planktic foraminiferal datums such as FADs Globorotalia acostaensis, Globigerinoides obliquus extremus, Globorotalia merotumida/plesiotumida, Globorotalia margaritae primitiva and the LADs Globigerina nepenthes, Globorotalia margaritae primitiva and Globorotalia margaritae evoluta. The Miocene/Pliocene boundary was placed at the FAD Globorotalia margaritae primitiva. In the Niger Delta, this boundary is commonly placed at the FADs Globorotalia margaritae margaritae and Globorotalia crassaformis probably due to nonrecovery of Globorotalia margaritae primitiva. However, in this studied section of the deep offshore southwestern Niger Delta, FAD Globorotalia margaritae primitiva occurs consistently in the three study wells and is therefore considered an appropriate datum for the placement of the Miocene/Pliocene boundary.

scholarly journals Foraminiferal analysis and paleoenvironments of sediments in well -Aa, deepwater offshore, Niger Delta, Nigeria

2020 ◽  
Vol 26 (1) ◽  
pp. 9-14
Author(s):  
Umoh Ekaete Enamekere ◽  
Fasina Peace Oluwaseyi
Keyword(s):  
Deep Water ◽  
Late Miocene ◽  
Benthic Foraminifera ◽  
Niger Delta ◽  
Planktonic Foraminifera ◽  
Older Age ◽  
Outer Shelf ◽  
Depth Interval ◽  
Entire Interval ◽  
Agglutinated Foraminifera

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.

scholarly journals Geological Evaluation of Hydrocarbon Prospect of FOB-field, Coastal Swamp Depobelt, Onshore, Niger Delta Basin, Nigeria

2019 ◽  
pp. 1-12
Author(s):  
Frankie O. Balogun ◽  
Franklin A. Lucas ◽  
Osarodion Ebomwonyi
Keyword(s):  
Late Miocene ◽  
Niger Delta ◽  
Seismic Facies ◽  
Well Logs ◽  
Environment Model ◽  
Multidisciplinary Data ◽  
Sedimentary Succession ◽  
Sequence Boundaries ◽  
Niger Delta Basin ◽  
Geological Position

Well logs, biostratigraphic data, seismic data and semblance map which together form a multidisciplinary data approach, were utilized in the geological evaluation of hydrocarbon prospect FOB-Field, onshore Coastal Swamp Depobelt in the Niger Delta Basin. Structural interpretation of faults, correlation of wells and 3D seismic interpretation were carried out using Schlumberger’s window based petrel software integrated with various lines of evidence such as sequence boundaries and maximum flooding surfaces. The penetrated sedimentary succession was established to constrain the alternation of sand packages from proximal to distal. The studied wells were dated mid to late Miocene based on the geological position of the sequence boundary (10.35Ma) and geological ages of the Mfs (9.5MaMfs) and (10.4MaMfs) respectively corresponding to the Coastal Swamp Depobelt of the Niger Delta Basin. Integration of well logs, seismic, semblance, paleobathymetric and biostratigraphic data indicated mid to late Miocene and neritic to bathyal paleoenvironment of deposition. Integration of fault integrity, seismic, well logs and key stratigraphic markers were utilized to build a seismic facies model and a gross depositional environment model for the FOB-Field.

scholarly journals Foraminifera biostratigraphy and paleoenvironmental studies of well-x, eastern Niger delta

2021 ◽  
Vol 9 (1) ◽  
pp. 28
Author(s):  
Samuel Ibukunoluwa Adeola ◽  
John Adewole Adeola ◽  
Victoria Abiola Dairo
Keyword(s):  
Marine Environment ◽  
Late Miocene ◽  
Niger Delta ◽  
Middle Miocene ◽  
Shallow Marine ◽  
Shallow Marine Environment ◽  
Foraminiferal Species ◽  
Neogloboquadrina Dutertrei

Ditch cutting samples from Well-X drilled in the Eastern part of the Niger delta were subjected to biostratigraphy and paleoenvironmental studies using micropaleontological analysis to identify the foraminifera present in the sections penetrated by the well.A total of 50 (fifty) foraminifera species made up of benthonic and planktic spp were recovered from the sections. The marker species identified are Globorotalia acostaensis, Globorotalia mernadii cultrate, Neogloboquadrina dutertrei, Globorotalia plesiotumida, Globorotalia obesa, Globorotalia nepenthes, Sphaeroidinella subdehiscens, Neogloboquadrina dutertrei, Globigerinoides sudquadratus.The four (4) biozones identified are N16 (Late Miocene 9.5Ma - 10.9Ma), N15-N14, N13-N12 and N12-N11 (Middle Miocene with corresponding ages 10.9Ma -11.8Ma, 11.8Ma-12.2Ma and 12.2Ma respectively).Using the encountered benthonic foraminiferal species, the paleoecology was determined; and it was revealed that the paleoenvironment of the section ranges from Inner Neritic to Outer Neritic Environment. Also, the lithological analysis revealed an intercalation of Shale, Mudstone and Sand which indicates various paleoecological episodes that led to their deposition.The age of the well was inferred from the bioevents of the marker species to be Middle Miocene to Late Miocene with the sparse occurrence of the Calcareous Benthic and the Plankonic species suggesting a shallow marine environment.   

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