jzs-10724

Nannofossil distribution in the late Jurassic- Naokelekan and Barsarin Formations, Miran Oil field, well-2-, Kurdistan, Northeastern Iraq

Soran O. A. Kharajiany 1 & Ibrahim M. J. Mohialdeen 2

1Department of Plastic Art, Ceramics, College of Fine Arts, University of Sulaimani, Kurdistan, Iraq
2Department of Geology, College of Science, University of Sulaimani, Kurdistan, Iraq


Abstract

The Naokelekan and Barsarin Formations of the Upper Jurassic are studied in the oil well Miran -2- at the Sulaimani area of Kurdistan. The study is focused on the determination of
nannofossil contents and age of both rock units. Based on the calcareous nannofossil marker species, twelve cutting samples were selected from both formations in that well. The lithology of the Naokelekan Formation is dominated by black shale, and some white rock fragments, while the lithology of the Barsarin Formation is characterized by high abundance of darkgrey and grey limestone towards bottom, where the ratio of milky- white limestone is increased upward. The nannofossil species that identified for the first time here are
Conusphaera mexicana, Polycostella senaria, Nannoconus compressus, Helenea staurolithina, Watznaueria britannica, Watznaueria barnesiae, Lotharingius hauffii, Faviconus multicolumnatus and Parhabdolithus robustus. This assemblage proved the Late Jurassic; the index nannofossils and biostratigraphic zonation indicated that the age of the
Naokelekan Formation is dated back to Early Tithonian, and the Barsarin Formation to late Early-Middle Tithonian. Preservation of the calcareous nannofossils in the well is bad to
moderate. The calcite grains are re-crystallized and caused difficulty in the identification.

Key Words: Naokelekan, Barsarin, Jurassic, Calcareous nannofossils, Conusphaera mexicana, Watznaueria britannica, Nannoconus compressus, Polycostella senaria,  Miran Oil Field.


References: 

[1] Abdula, R. A. "Organic geochemical assessment of Jurassic potential source rock from Zab-1 well, Iraqi Kurdistan", Iraqi Bulletin of Geology and Mining Vol.12, No.3, pp.53-64. (2016a).

[2] Abdula, R. A. "Stratigraphy and Lithology of Naokelekan Formation in Iraqi Kurdistan-Review", The International Journal Of Engineering And Science (IJES), Vol.5, Issue 8, pp.7-17. (2016b).

[3] Ahmed, S. M. "Source Rock Evaluation of Naokelekan and Barsarin Formations (Upper Jurassic) Kurdistan Region/ N. Iraq", MSc.Thesis, University of Sulaimani, Kurdistan Region, Iraq, 174p, (2007).

[4] Ahmed, S. H., Qadir, B. O., and Müller, C. "Age determinations of Cretaceous sequences based on calcareous nannofossils in Zagros Thrust and Folded Zone in Kurdistan Region-Iraq", Journal of Zankoi Sulaimani, Vol.17, No.3, pp.185-195. (2015).

[5] Al-Ameri, T. K., and Zumberge, J. "Middle and Upper Jurassic hydrocarbon potential of the Zagross Fold Belt, North Iraq", Mar Pet Geol Vol. 36, pp.13-34. (2012).

[6] Al-Ameri, T. K., Najaf, A. A., Al-Khafaji, A. S., Zumberge, J., and Pitman, J." Hydrocarbon potential of the Sargelu Formation, North Iraq", Arabian Journal of Geosciences, DOI 10.1007/s12517-013-0875-8. (2013).

[7] Al-Hussaini, M. "Jurassic Sequence stratigraphy of the Western and southern Arabian Gulf ", Geo Arabia, Vol.2, No.4, pp.361-382. (1997).

[8] Al-Badry, A. M. S. "Stratigraphy and geochemistry of Jurassic formations in selected sections -northern Iraq", unpublished PhD. dissertation, College of Science, University of Baghdad, Baghdad, Iraq, 162p. (2012).

[9] Aqrawi, A. A. M., Horbury, A. D., Goff, J. C., and Sadooni, F. N. "The Petroleum Geology of Iraq", Beaconsfield, Bucks, UK: Scientific Press Ltd, 424p. (2010).

[10]Baban, D. H., and Ahmed, S. M. "Vitrinite reflectance as a tool for determining level of thermal maturity for the Upper Jurassic Naokelekan and Barsarin Formations in Sargelu location, Kurdistan Region, NE Iraq", Arabian Journal of Geosciences, DOI 10.1007/s12517-013-0938-x. (2013).

[11]Bellen, R. C. Van, Dunnington, H. V., Wetzel, R., and Morton, D. M. "Lexique Stratigraphique International", Paris, Iraq: Fascicule 10a, 333p: (1959).

[12]Bown, P. R., & Cooper, M. K. E. "Jurassic. In: Bown, P. R., (Editor), Calcareous Nannofossil Biostratigraphy", British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp.34-85. (1998).

[13]Bralower, T. J., Monechi, S., & Thierstein, H. R. "Calcareous nannofossil zonation of the Jurassic- Cretaceous boundary interval and correlation with the geomagnetic polarity timescale", Marine Micropaleontology, Vol. 14, pp. 153-235. (1989).

[14]Buday, T. "The Regional Geology of Iraq. Stratigraphy and Paleogeography", (Vol.1). Mosul, Iraq: Dar Al-Kutib Publishing house, University of Mosul, 445p. (1980).

[15]Fatah. S. S. "Source Rock evaluation and Biomarker distribution of Middle Jurassic sargelu Formation, Sulaimani area, Kurdistan region NE-Iraq", unpublished Msc. thesis, 116 p. (2014).

[16]Heritage report, Project Ref: ECV1851, (2012).

[17]International Nannoplankton Association (INA) website, http://ina.tmsoc.org/Nannotax3/ntaxchartS. html.ersity, (2013).

[18]Jassim, S. Z., & Goff, C. "Geology of Iraq", Dolin, Prague and Moravian Museum, Brno, 341p. (2006).

[19]Mohialdeen, I. M. J., Hakimi, M. H., and Al-Beyati, F. M. "Geochemical and petrographic characterization of Late Jurassic-Early Cretaceous Chia GaraFormation in Northern Iraq", Palaeoenvironment and oil-generation potential, Marine and Petroleum Geology, Vol. 43. pp.166-177. (2013).

[20]Mohialdeen, I.M.J., Mustafa, K.A., Salih, D.A., Sephton, M.A., and Saeed, D.A. "Biomarker analysis of the Upper Jurassic Naokelekan and Barsarin formations in Miran Well-2, Miran Oil Field, Kurdistan Region, Iraq", Arabian Journal of Geosciences, Vol. 11, pp. 51. (2018). https://doi.org/10.1007/s12517- 018-3405-x.

[21]Murris, R. J. "Middle East: stratigraphic evolution and oil habitat", American Association of Petroleum Geologists Bulletin, Vol. 64, pp. 597-618. (1980).

[22]Salae, A. T. "Stratigraphy and Sedimentology of the Upper Jurassic Succession, NE Iraq", M Sc. thesis, University of Baghdad, 95p. (2004).

[23]Sadooni, F. N. "Stratigraphy and petroleum prospects of Upper Jurassic carbonates in Iraq", Pet.Geosci., Vol. 3, pp.233–243. DOI:10.1144/petgeo.3.3.233. (1997).

[24]Wimbledon, W. A. P., Mohialdeen, I. M. J., Andreini, G., Rehakova, D., and Stoykova, K. "The Jurassic /Cretaceous boundary beds in Kurdistan- a preliminary note on wider correlations", Journal of Zankoy Sulaimani, Special Issue, GeoKurdistan II, pp.269-276. (2016).