The Late Cretaceous X Reservoir petrophysics properties and its Oil Geochemistry in the Nameless Oilfield, Mesopotamian Basin, South Iraq

Authors

  • Fahad M. Al-Najm University of Basra, College of Science
  • Amer Jassim Al-Khafaji University of Babylon, College of Science
  • Fadhil N. Sadooni Qatar University

DOI:

https://doi.org/10.52716/jprs.v12i1(Suppl.).622

Keywords:

X reservoir, Depositional System, Porosity, Reservoir units, Biomarkers, Nameless field, Iraq

Abstract

The X Formation, which dates from the Late Cenomanian to the early Turonian, is the largest carbonate reservoir in Iraq's South Mesopotamian Basin. There are two shallowing-up depositional periods in it, which begin with deep water mudstone associated with wackestone, which gradually shallows into rudist and is dominated by big foraminifera shoals and barriers, which are followed by lagoonal and intertidal facies. The identification of five distinct reservoir rock types, including mB2, mB1, CRII, mA, and CRI, was based on a combination of sediment types and diagenetic processes that influenced porosity types. The formation oil geochemical studies point to a Lower Cretaceous marine carbonate source depositional environment that is early mature and anoxic.

References

A. Aqrawi, J. C. Goff, . A. D. Horbury and F. N. Sadooni, The Petroleum Geology of Iraq, Beaconsfield, United Kingdom: Scientific Press Ltd, PO Box 21, Beaconsfield, Bucks, HP9 1NS., 2010.

K. Al-Naqib, "Geology of Arabian Peninsula Southern Iraq," U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 560-G, USA, 1967.

R. Sharland, D. M. Archer, D. M. Casey, R. B. Davies, S. H. Hall, A. P. Heward, A. . D. Horbury and M. Simmons, Arabian Plate Sequence Stratigraphy, Manama, Bahrain: Geo Arabia Special Publication, Gulf Petro link, 2011.

T. A. Mahdi and A. A. Aqrawi, "Sequence stratigraphic analysis of the mid-Cretaceous X formation, southern Mesopotamian basin, Iraq," Journal of Petroleum Geology, vol. 37, no. 3, pp. 287-312, 2014.

A. Aqrawi, G. A. Thehni, G. H. Sherwani and B. M. Kareem , "Mid-Cretaceous rudist-bearing carbonates of the X Formation: An important reservoir sequence in the Mesopotamian Basin, Iraq," Journal of Petroleum Geology, vol. 21, no. 1, pp. 57-82, 1998.

A. Al-Khafaji, M. H. Hakimi and A. A. Najaf , "Organic geochemistry characterization of crude oils from X reservoir rocks in the Southern Mesopotamian basin, South Iraq: Implication for source input and paleoenvironmental conditions," Egyptian Journal of Petroleum, vol. 27, no. 1, pp. 117-130, 2018.

H. S. Afrah, "Microfacies analysis and petrographic study of the X Formation, in selected wells from southeastern of Iraq," ournal of Petroleum Research and Studies, vol. 9, no. 1, 2019.

F. M. Al-Najm, M. F. Al-Shahwan and F. M. Al-Beyati , "Petrophysical Characteristics and Reservoir Modeling of X Formation at W Oil Field, South of Iraq," Journal of Petroleum Research and Studies, vol. 7, no. 1, 2017.

T. K. Al-Amer and A. J. Al Khafaji , "X Formation oil biomarkers used to assess hydrocarbon generation, migration path and accumulation sites in the B, C, A North and South oil fields, southern Iraq.," in European Association of Geoscientists & Engineers, GEO 2008, Manama, 2008.

T. K. Al-Ameri, A. J. Al Khafaji and J. Zumberge , "Petroleum system analysis of the X reservoir in D, A, North and South A oil fields, southern Iraq," GeoArbia, vol. 14, p. 91–108, 2009.

A. Embry and . J. E. Klovan, "A Late Devonian Reef Tract on Northeasterm Banks Island," Canadian Petroleum Geology, vol. 19, pp. 730-781, 1971.

P. W. Choquette and L. C. Pray, "Geologic nomenclature and classification of porosity in sedimentary carbonates," AAPG Bulletin, vol. 54, pp. 207-250, 1970.

Z. Sofer, "Stable carbon isotope compositions of crude oils: application to source depositional environments and petroleum alteration," Am. Assoc. Petrol. Geol. Bull, vol. 68, p. 31–49, 1984.

F. Sadooni, "Impact of the demise mechanisms of the Cretaceous rudist buildups in the Arabian Plate on their reservoir characteristics.," Carbonates and Evaporites, vol. 33, p. 465–476, 2017.

A. A. Al-Siddiki, "Subsurface stratigraphy of southern Iraq. Proceedings," in Proceedings 10th Arab Petroleum Congress,, Libya, 1978.

K. E. Peter, C. W. Cliford and J. M. Moldowan, The biomarker guide, volume 2–Biomarkers and isotopes in petroleum exploration and earth history, UK: Cambridge University Press, 2005.

A. A. Aqrawi and B. Balazs , "Geochemical characterisation, volumetric assessment and shale-oil/gas potential of the Middle Jurassic–Lower Cretaceous source rocks of NE Arabian Plate.," GeoArabia, vol. 20, no. 3, pp. 99-140, 2015.

A. Al-Khafaji, F. M. Al Najm, R. N. Al Ibrahim and F. N. Sadooni, "Geochemical investigation of Y5 crude oils and their inferred source rocks in the Mesopotamian Basin, Southern Iraq," Petroleum science and technology, vol. 37, no. 18, p. 025–2033, 2019.

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Published

2022-04-21

How to Cite

(1)
Al-Najm, F. M.; Al-Khafaji, A. J.; Sadooni, F. N. . The Late Cretaceous X Reservoir Petrophysics Properties and Its Oil Geochemistry in the Nameless Oilfield, Mesopotamian Basin, South Iraq. Journal of Petroleum Research and Studies 2022, 12, 54-67.