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International Journal of Scientific and Engineering Research
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ISSN Print: 2229-5518 7    
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scirp IJSER >> Volume 3,Issue 7,July 2012
Biostratigraphy, Depositional Environment and Sequence Stratigraphy of Akata Field (Akata 2, 4, 6 and 7 Wells), Eastern Niger Delta, Nigeria
Full Text(PDF, )  PP.34-60  
E.A. Okosun, J.N.Chukwu, E.O. Ajayi, O.A. Olatunji
Akata field, Benthic foraminifera, Biostratigraphy, Calcareous nannofossils, Depositional Environment, Niger Delta, Planktic foraminifera, Sequence stratigraphy
Foraminiferal biostratigraphy and sequence stratigraphic analysis were carried out in the Akata Field from Akata-2, Akata-4, Akata-6 and Akata-7 wells in the eastern Niger Delta. Three planktic foraminiferal zones Globorotalia continuosa, Globorotalia obesa/Globorotalia mayeri, and Globorotalia peripheroacuta together with three benthic zones of Spirosigmoilina oligocaenica, Uvigerina sparsicostata, and Eponides eshira/Brizalina mandorovensis were established in both Akata-2 and Akata-4 wells. One planktic foraminiferal zone of Praeorbulina glomerosa was proposed for Akata-6 and Akata-7 wells. One benthic zone of Brizalina mandorovensis/Eponides eshira and Poritextularia panamensis are proposed for Akata-6 and Akata-7 wells respectively. Calcareous nannofossil analysis was also carried out in Akata-6 and Akata-7 wells, Sphenolithus heteromorphus Zone was established in both wells. Miocene age has been assigned to the studied intervals of the four wells based on the foraminiferal assemblages. The studied wells were correlated using the established biostratigraphic zones. A littoral (deltaic) to marine (outer neritic) environments of deposition has been inferred for the four wells based largely on the presence of environmentally restricted benthic foraminifera species. Three third order maximum flooding surfaces were recognized in Akata-2 and 4 while two were recognized in Akata-6 and 7 wells. The wells have been divided into sequences and systems tracts.
[1] E.A. Fayose, “Stratigraphical paleontology of Afowo-1 well, Southern Nigeria,”J. Minning and Geology, vol. 5, pp. 1-97, 1970.

[2] S.W. Petters, “Some Late Tertiary foraminifera from parabe-1 well, Eastern Niger Delta,” J. Revista Espanola de micropaleontologia, vol. 11, pp.1190-1333, 1979.

[3] B.V. Adeniran, “Quantitative Neogene Planktic foraminiferal biostratigraphy of western Niger Delta, Nigeria,” J. Nigerian Association of Petroleum Exploration, vol.12, no.1, pp. 54- 69, 1997.

[4] E.A. Okosun and A. Liebau, “Foraminiferal Biostratigraphy of Eastern Niger Delta, Nigeria,” J. Nigerian Association of Petroleum Explorationist, vol.14, no.2, pp. 136 -156, Nov. 1999.

[5] M.B. Ozumba and L.C. Amajor, “Evolutionary Relationships in some Benthic Foraminifera of the Middle to Late Miocene, Niger Delta”, J. Nigeria Association of Petroleum Explorationist, vol.14, no.2, pp. 157-167, Nov. 1999.

[6] O. Ogunjobi “Calcareous Nannofossils Index for Recognition of Marine Transgressions”, J. Nigeria Association of Petroleum Exploration, submitted for publication.

[7] S.A. Oyebamiji, “Calcareous Nannofossil Biostratigraphy of a well in the Niger Delta, Nigeria,” M.Sc. Thesis, Dept. of Geology University College, London, 1997.

[8] S.L. Fadiya, “Foraminifera and Calcareous Nannofossil Biostratigraphy and well log Sequence Stratigraphic Analysis of Opolo-5 and Opolo-9 wells, Niger Delta,” M.Sc. Thesis, Dept. of Geology, Obafemi Awolowo, University, Ile-Ife, 1999.

[9] E. Martini, “Standard Tertiary and Quaternary Calcareous Nannoplankton from the Experimental Mahole Drilling,” J. Paleontology, Vol.37, pp. 845 –855, 1971.

[10] H. Okada and D. Bukry, “Supplementary Modification and Introduction of code numbers to Low Latitude Coccolith Biostratigraphic Zonation”, J, Marine Micropaleontology, Vol.5, pp. 321-325, 1980.

[11] E.A. Farnacci, A. Distefano, D. Rio and A. Negri, “Middle Miocene Quantitative Calcareous Nannofossil Biostratigraphy in the Mediterranean Region”, J. Micropaleontology, Vol.42, pp. 38-64, 1996.

[12] E. Farnacci, “Calcareous Nannofossil Biostratigraphy of the California Margin Proceedings of the Ocean Drilling Program”, J. Scientific Results, Vol.167, pp. 3 -40, 2000.

[13] W.H. Blow, “The Late Middle Eocene to Recent Planktonic Foraminiferal Biostratigraphy”, First Geneva Conf. Planktonics, pp. 199-422, 1969.

[14] W.H. Blow, “The Cainozoic Globigerinida”, Leiden, E.J. Brill, 2-1413 (1979).

[15] P. Stracher, “Present Understanding of the Niger Delta Hydrocarbon Habitat” Geology of Deltas, M.N. Oti and G. Postma, eds. Balkema, Rotter-dam, pp.1-267, 1995.

[16] M.B. Ozumba, “Late Miocene-Pliocene Biostratgraphy Offshore Niger Delta,” J. Nigerian Association of Petroleum Explorationist, Vol.10, pp. 40-48, 1995.

[17] A.R.Jr. Loeblich and H. Tappan, “Sarcodina Chiefly Thecamoebians and Foraminiferida”,Treatise on Invertebrate Paleontology, part C, Protista, Vols. 1 and 2, R.C. Moore, ed., U.S.A., Geological Society of American and University of Kansas Press, pp. C1 –C900, 1964.

[18] J.W. Murray, “Ecology and Paleoecology of Benthic Foraminifera”, New York, John Willey and Sons Inc. pp.5-397, 1991.

[19] S.W. Petters, “Nigerian Paleocene Benthonic Foraminiferal Biostratigraphy, Paleoecology and Paleobiologeography”, J. Marine micropaleontology, vol. 4, pp. 85-99, 1979.

[20] S.W. Petters, “Central West African Cretaceous-Tertiary Benthic Foraminifera and Stratigraphy”, J. Paleontographical, vol.179, pp. 1-104, 1982.

[21] J.A. Postuma, “Manual of Planktonic Foraminifera”, London, Elsevier Publishing company Amsterdam, pp.1-150, 1971.

[22] B. Haq, J. Hardenbol and P.R. Vail, “The Chronology of Fluctuating Sea Level since the Triassic”, J. Science, vol.235, pp. 1156-1167, 1987.

[23] J. Backman, “Miocene-Pliocene nannofossils and sedimentation rates in Hatton-Rockall Basin, NE Atlantic Ocean”, J. Stockholm contribution in Geology, vol. 36, pp. 1-91, 1980.

[24] K. Perch-Nielsen, “Cenozoic Calcareous Nannofossil,” Plankton Stratigraphy, H.M. Bolli, J.B. Saunders and K. Perch-Nielsen, eds. Cambridge Earth Sciences Series, Cambridge University press, pp. 100-554, 1985.

*25+ W. H. Blow, “Late Middle Eocene to Recent Planktonic Foraminiferal Biostratigraphy,” Proc. First International Conf. Planktonic Microfossils, pp.199 – 422, 1969.

*26+ W.H. Blow, “The Cainozoic Globigerinida,” Leiden, E.J. Brill, pp.1400- 1413, 1979.

[27] H.M. Bolli and J. B. Saunders, “Oligocene to Holocene Low Latitude Planktic Foraminifera”, Plankton Stratigraphy, H.M. Bolli, J.B. Saunders and K. Perch-Nielsen, eds. Cambridge Earth Sciences Series, Cambridge University Press, pp. 165-262, 1985.

*28+ A. Boersma, “Foraminifera,” Introduction to Marine Micropaleontology, B. U. Haq and A. Boersma, eds. Elsevier North Holland Inc. pp.50- 69, 1978.

[29] O.L. Bandy and R. E. Arnal, “Concept in Foraminiferal Biostratigraphy,” J. American Association of Petroleum Geologists Bulletin, vol. 44, no.12, pp. 1921 – 1932, 1960.

[30] O.L. Bandy and R. E. Arnal, “Distribution of Recent Foraminifera off the West Coast of Central America,” J. American Association of Petroleum Geologists Bulletin, vol. 41, no. 9, pp. 2037 – 2052, 1957.

[31] J.C. Van Wagoner, R.M.Jr. Mitchum, H.W. Posamentier and P.R. Vail, “Key Definitions of Sequence Stratigraphy,” Atlas of Seismic Stratigraphy, part 2, A. W. Bally, ed. American Association of Petroleum Geologists studies in Geology, Tulsa Oklahoma 74101, U.S.A. pp. 10-14, 1987.

[32] J.C. Van Wagoner, H.W. Posamentier, R.M.Jr. Mitchum, P.R. Vail, J.F. Sarg, T.S. Loutit, and J. Hardenbol, “An Overview of Sequence Stratigraphy and Definitions,” Sea level changes, an integrated approach, C. K. Wilgus, B. S. Hastings, H.M. Posamentier, J.C. Van Wagoner, C.A. Ross, and C. G. Kendall, eds. Society of Economic Paleontologist and Mineralogist special publications, vol.42, pp. 39 – 45, 1988.

[33] B.U. Haq and W.A. Beggren, “Late Neogene Calacreous Nannoplankton Biochronology of the Rio Grande Rise (Southern Atlantic),” J. Paleontology, vol. 52, pp.1167 – 1194, 1978.

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