Effect of the Deep Marin Balambo Formation on the Qamchuqa Reservoirs in Jambur Field


  • Ayub Mohammed Ahmed Shwani 5Geology Department, Field Division, North Oil Company, Ministry Oil, Kirkuk, Iraq
  • Jayran K. Qadir Geology Department, Field Division, North Oil Company, Ministry Oil, Kirkuk, Iraq
  • Shukur A. Rahman Quality Management section, North Oil Company, Ministry Oil, Kirkuk, Iraq
  • Ali S. Alsaqi Alsaqi Geology Department, Field Division, North Oil Company, Ministry Oil, Kirkuk, Iraq
  • Amel K. Nooralddin Geology Department, Field Division, North Oil Company, Ministry Oil, Kirkuk, Iraq




Qamchuqa Formation, Balambo Formation, Jambur Oil field, Interfingers, Reservoirs


A shallow-marine carbonate known as Qamchuqa Formation was originally discovered in northern Iraq's Qamchuqa Gorge at an outcrop section. For the present study the available conventional well logs include gamma ray, porosity logs (density, and neutron) with the resistivity logs used to achieve the depositional environment of the studied area in selected wells Ja-21, Ja-32, Ja-41, Ja-46, and Ja-18. The Aptian-Albian age include lower and upper Qamchuqa formations, respectively are considered a major reservoir in Jambur Oil field; therefore, the present study focused only on lower and upper Qamchuqa formations. Deep marine environment Balambo Formation separated the Aptian-Albian reservoir into three parts each part is different in petrophysical properties and lithology composition. Zone -1 is shoal facies including lower and upper Qamchuqa formations composed of dolomite, dolomitic limestone and limestone, this part is far from interfingers with Balambo Formation. Zone -2 is mixed facies between shoal facies and basinal facies composed of limestone, marly limestone,shaly limestone and with a few streaks of dolomitic limestone. This part includes well Ja-32, Ja-41, and Ja-46. Zone -3 basinal facies include Balambo Formation composed of limestone, shaly and marly limestone involving well Ja-18 only. These differences above caused interfingering and lateral change in both reservoir units (lower and upper Qamchuqa formations) with Balambo Formation, and both are not depicting reservoir in Zone -2 and especially in Zone -3. The current study explains well Ja-18 located on the permanent basin and well Ja-32, Ja-41, and Ja-46 located between permanent basin and neritic zone (mixed zone or slope margin); therefore, the south east of Jambur Oil field abandoned to drill in it to Cretaceous age.



N. A. Noori, S. J. Sa'ad, and S. I. Al-Dulaim, “Biostratigraphy of Mauddud Formation in Badra well–1; Eastern Iraq”, Journal of University of Babylon, vol. 24, no. 3, pp. 740-754, 2016.

T. Buday, “The regional geology of Iraq: Stratigraphy and Paleogeography”, Kassab, I.I. and Jassim, S.Z., (eds), Dar Al-Kutib Publ. House, Mosul, Iraq, vol. 1, pp. 445, 1980.

I. M. J. Mohialdeen, S. S. Fatah, R. A. Abdula, M. H. Hakimi, W. H. Abdullah, P. A. Khanaqa, and G. A. Lunn, “Stratigraphic correlation and source rock characteristics of the Baluti Formation from selected wells in the Zagros fold belt, Kurdistan Region, northern Iraq”, Journal of Petroleum Geology, vol. 45, no. 1, pp. 29-56, 2022. https://doi.org/10.1111/jpg.12806

NOC, “A geological study of the Cretaceous reservoirs in Jambur Oil field”, Northern Oil Company, Kirkuk, Internal report (in Arabic), pp.102-145, 1988.

B. Al-Qayim, S. Hussein, F. M. Qader, S. H. Al-Hakari, B. Shukor, Z. Sardar, D. Ahmed, and H. Abdullah, “Integrated stratigraphic study of the Cretaceous petroleum-potential succession, Sulaimani area, Kurdistan, Iraq”, Journal of Zankoy Sulaimani, Special Issue, GeoKurdistan II, pp. 420-421, 2016.

M. H. Kamel, and M. M. Mohamed, “Effective porosity determination in clean/shaly formations from acoustic logs”, Journal of Petroleum Science and Engineering, vol. 51, no. (3-4): pp. 267-274, 2006. https://doi.org/10.1016/j.petrol.2006.01.007

N. Ruhovets, W. H. Fertl, “Volumes, types, and distribution of clay minerals in reservoir rocks based on well logs”, Paper presented at the SPE Unconventional Gas Recovery Symposium, Pittsburgh, Pennsylvania, pp. 64-79, 1982. https://doi.org/10.2118/10796-MS

A. M. Abudeifa, M. M. Attiaa, A. E. Radwanb, “Petrophysical and petrographic evaluation of Sidri Member of Belayim Formation, Badri Field, Gulf of Suez, Egypt”, Journal of African Earth Sciences, vol. 115, pp.108-120, 2016. https://doi.org/10.1016/j.jafrearsci.2015.11.028

D. Tiab, and E. C. Donaldson, “Petrophysics – Theory and practice of measuring reservoir rock and fluid transport properties”, 4th Ed., Boston: Gulf Publishing Co., pp. 260-628, 2015.

P. W. J. Glover, “Petrophysics: MSc Petroleum Geology”, University of Aberdeen, UK, pp.4, 2008.

E. Flügel, “Microfacies of carbonate rocks, analysis interpretation and application”, Springer-Verlag, Berlin, pp. 278-281, 2004.

R. O. Baker, H. W. Yarranton, and J. L. Jensen, “Practical reservoir engineering and characterization”, Gulf Professional Publishing, 1st, Elsevier, Oxford, pp.40-44, 2015.

S. Canon, “Petrophysics: A practical Gguide”, Wiley Blackwell, pp,85, 2016.

Schlumberger, “Log Interpretation Principles/Applications”, Sguard Land, Texas, Chapter 8: pp. 1, 1989.

Lee M. Etnyre, “Finding oil and gas from well logs”, Springer Science and Business Media, New York, pp. 31-34, 1989. https://doi.org/10.1007/978-1-4757-5230-4

F. M. Qadir, “Formation evaluation of upper Qamchuqa reservoir”, Khabaz Oil field, Kirkuk area, northeastern Iraq, Unpublished Ph. D. Thesis, University of Sulaymaniyah, Iraq, pp.15-17, 2008.

M. A. Al-Eisa, “Stratigraphy of Early Cretaceous of subsurface sections from middle Iraq”, Mosul University, Unpublished Ph.D. (in Arabic), pp.7-10, 1997.




How to Cite

Shwani, A. M. A.; Qadir, J. K. .; Rahman, S. A.; Alsaqi, A. S. A.; Nooralddin, A. K. . Effect of the Deep Marin Balambo Formation on the Qamchuqa Reservoirs in Jambur Field . Journal of Petroleum Research and Studies 2024, 14, 1-16.