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Title: Sedimentology and petroleum prospects of the Qamchuqa Group, northern Iraq
Author: Al-Sadooni, Fadhil Noomas
ISNI:       0000 0004 2699 1834
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 1978
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The Middle-Lower Cretaceous sediments of northern Iraq consist of massive dolostone and dolomitic limestone. These are exposed extensively in the Folded Zone and represent potential oil reservoirs in the subsurface of both the Foothill Zone and the Mesoptamian Plain. Stratigraphically, these sediments consist of three neritic formations, Mauddud with its lateral equivalent the lagoonal-supratidal Jawan formation, the Shuiaba and the Garague. Previous conflicts in the stratigraphy are reviewed in the light of recent subsurface data from Kirkuk, Bai Hassan and Jambur oi1fie1ds. This stratigraphy is compared with outcrops at Sefin-Dagh and Geli Ali Beg. As a result, a new group, the Qamchuqa is introduced to include all these formations. A new carbonate rock classification is introduced to deal with both the complicated depositional and diagenetic fabrics of this group. Integrated logs, facies analysis and especially cluster analysis have shown that the Qamchuqa is a rudist-algalhydrozoan bank (not a reef), grading westwards into mi1io1idic - pelwackestone, stromatolitic limestone and nodular anhydrite. Intertonguing with basinal, globigerinal mudstone and wackestone occurs towards the east. The following diagenetic features occur within the group. Micritization and algal borings are selective with relation to fossil-test architecture. Three dolomite generations are found, these are related to refluxion, schizoh&line and cannibalization processes. Porosity is mainly secondary in origin, related to dolomitization. Two generations of cement are present. A new type of secondary silica termed rosette-quartz is described. Chemical analyse.s of seventy-two samples have shown that these rocks are mainly dolomitic limestone and dolomite with MgO content up to 21%. Strontium is considered to be the most useful trace element as its concentration increases with evaporite and clay content but decreases with magnesium. Aluminium, titanium and potassium have a similar behaviour and are dependent on the clay content. The Mauddud and Shuiaba in Jambur and eastern Kirkuk oilfields are considered to be the main potential areas for hydro-carbon accumulations.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available