Porosity Evolution of the Early Cretaceous, Qamchuqa Formation in northeastern part, Iraq
DOI:
https://doi.org/10.24237/ASJ.03.01.824AKeywords:
Key words: Qamchuqa Formation, Porosity evolution, vuggy pores, intercrystal dolomite pores, microfracturs poresAbstract
The Qamchuqa Formation was studied in Kosrat Anticline in Dokan area in Sulaimanyia governorate, Kurdistan region, Northeastern Iraq. The 14 slides of 14 rock samples were maked and studied under different microscopes. Petrographic properties and types of pores determined in this study, related to Qamchuqa Formation. The formation consists of three units. Lower Unit (162 m) consists of dark grey, massive limestone. Middle Unit (139 m) consists of alternation of grey very coarse crystalline dolomitic limestone and yellowish green marl. Upper Unit (384 m) consists of grey massive limestone and dolomitic limestone.
The high values of porosity in the Qamchuqa Formation can be resulted from vuggy porosity and the stylolite systems too. The high values of porosity in last stage of pores evolution can be attributed to intercrystal porosity, vuggy porosity and secondary fractures systems.
Three types of pores were found in Qamchuqa Formation, these are intercrystal dolomite pores, vuggy pores, and microfracturs pores. The Qamchuqa Formation in the present study at Kosrt anticline can be considered as a petroleum reservoir because of the ratio of bitumen materials to the size of pores. As well as, Qamchuqa Formation in the present study is characterized by leakage of petroleum materials to the surface.
References
V. K. Sissakian, B. M. Al-Jiburi, Stratigraphy of the high folded zone, Iraqi
Bulletin of Geology and Mining, 6, 73-16(2014)
F. N. Sadooni, A.S. Alsharhan, Stratigraphy, microfacies, and petroleum potential
of the Mauddud Formation (Albian–Cenomanian) in the Arabian Gulf basin,
American Association of Petroleum Geologists Bulletin, 87, 10, 1653-
(2003), DOI(https://doi.org/10.1306/04220301111)
B. Al-Qayim, F. Rashid, Resevoir Characteristics of The Albian Upper
Qamchuqa Formation Carbonate, TaqTaq Oil Field, Kurdistan, Iraq, (2012),
DOI(https://doi.org/10.1111/j.1747-5457.2012.00533.x)
K. M. Al-Naqib, Geology of the southern area of Kirkuk Liwa, Iraq, Technical
Publication, Iraq Petroleum Company Ltd, 50(1960)
J. Al-Shakiry, The petrology of part of the Qamchuqa Formation in Jambur oil
field .Iraq, Un.pub, Ms.c. Thesis University of Baghdad, 155(1977)
T. Buday, The regional geology of Iraq, Stratigraphy and paleogeography,
Publications of Geological Survey of Iraq, Baghdad, 1, 445(1980)
F. N. Al-Sadooni, Sedimentary and Petroleum Prospect of Qamchuqa GroupNorthern Iraq, Unpublished Ph. D Thesis, University of Bristol, 363(1978)
A. Sahar, Dolomitization of Upper Qamchuqa Formation northern Iraq,
Unpublished, MSc thesis, University of Baghdad, Iraq, 182(1987)
S. Al-Shdidi, G. Thomas, J. Delfaud, Sedimentology, Diagenesis and Oil Habit of
Lower Cretaceous Qamchuqa Group, Northern Iraq, American Association of
Petroleum Geologists Bulletin 79, 5, 763-779(1995)
Al-Juboury, B. AL-Zoobay, Q. AL-Juwainy, Facies analysis of the
AlbianCenomanian carbonates, northeastern Iraq, Earth and Life, 1, 1-14(2006)
B. M. Ameen, Sedimentary and Lithostratigraphy of Qamchuqa Formation from
Kurdistan Region, NE-Iraq, Unupublished Ph. D. Thesis, University of
Sulaimaniya, (2008), DOI(https://doi.org/10.46717/igj.54.1B.9Ms-2021-02-27)
B. Al-Qayim, F. Qadir, F. AL-Biaty, Dolomitization and porosity evaluation of
the Cretaceous Upper Qamchuqa (Mauddud) Formation, Khabbaz oilfield,
Kirkuk area, northern Iraq, GeoArabia 15, 4, 49-76(2010),
DOI(https://doi.org/10.2113/geoarabia150449)
M. Chatton, E. Hart, Revision of Tithonian –Albian Stratigraphy of Iraq
Manuscript report ,GEOSURV ,Baghdad, (1960)
V. K. Sissakian, S. F. Fouad, Geological map of Iraq, scale 1: 1000 000,
, Iraqi Bulletin of Geology and Mining, 11(1), 9-16(2015)
S. Z. Jassim, J. C. Goff, Geology of Iraq, Published by Dolin, Prague and
Moravian Museum, Berno, 341(2006)
K. H. Karim, Basic Principle of Geology of Iraq, University of Sulaimaniya,
(2011)
L. S. Land, D. R. Prezbindowski, The origin and evolution of saline formation
water, Lower Cretaceous carbonates, south-central Texas, USA, Journal of
Hydrology, 54(1-3), 51-74(1981), DOI(https://doi.org/10.1016/0022-
(81)90152-9)
A. Collins, Geochemistry of oilfield waters,( Elsevier, 1975)
E. Heydari, Hydrotectonic models of burial diagenesis in platform carbonates
based on formation water geochemistry in North American sedimentary basins,
(1997)
W. J. Harrison, R. N. Tempel, Diagenetic Pathways in Sedimentary Basins:
Chapter 6, DIAGENESIS AND BASIN HYDRODYNAMICS, (1993)
P. W. Choquette, L.C. Pray, Geologic Nomenclature and Classification of
Porosity in Sedimentary Carbonates. American Association of Petroleum
Geologists Bulletin, 54, 2, 207-250(1970)
C. H. Moore, Diagenetic environments of porosity modification and tools for
their recognition in the geologic record. Carbonate reservoirs porosity evolution
and diagenesis in a sequence stratigraphic framework, Developments in
Sedimentology, 55, 61-88(2001)
C. H. Moore, Upper Jurassic subsurface cements: a case history, (1985)
R. Sassen, C. H. Moore, Framework of hydrocarbon generation and destruction in
eastern Smackover trend, AAPG Bulletin, 72(6), 649-663(1988)
E. Heydari, C. H. Moore, Burial diagenesis and thermochemical sulfate
reduction, Smackover Formation, southeastern Mississippi salt
basin, Geology, 17(12), 1080-1084(1989)
C. H. Moore, Carbonate diagenesis and porosity, (Elsevier, 1989)
A. Sahaab, Paleoenvironmental conditions and diagenetic evolution of the
mishrif formation (Nasiriyah oil field, Iraq) (Doctoral dissertation, Lille 1),
(2017)
M. W. Longman, Fracture porosity in reef talus of a Miocene pinnacle-reef
reservoir, Nido B Field, the Philippines, in Carbonate petroleum reservoirs,
(Springer, 1985), 547–560
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