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The wireline logs analysis have been used to study the cretaceous rocks of Qamchuqa formation in the Kirkuk oil field. The area is tectonically leaving the foothill zone.The field subsurface anticline is asymmetrical with a length of 20 km and width of 4 km.The field has a couple pay area.TheKhabbaz oilfield reservoir is formed of two main parts which are tertiary (Jerbe reservoir) and cretaceous (upper and lower Qamchuqa reservoir). The upper part of Qamchuqa in the Khabbaz oilfield is divided into three groups. From the surface, unit A is between 156 to 180m and has an average thickness of 66 m. Unit B has an average thickness of 73m and unit C has an average of 34m.From the log data, the petrophysical properties of the Khabbaz oilfield’s four wells [Kz-1,Kz-5,Kz-11and Kz-16] have been assessed. The corrected useful log contains GR log, acoustic log, N-log, D-log and resistivity log. Both (Rxo and Rt) have the very good characteristic reservoir to unit A.The result shows that unit A have the best reservoir characteristics. The unit A is subdivided into six subunits (1-A, 2-A, 3-A, 4-A, 5-A and 6-A) which are distinguished by five non-reservoir subunits (1-N,2-N, 3-N, 4-N, and 5-N).In addition, the unit B and unit C are less porous reservoirs. Unit B is divided into three subunits (1-B, 2-B, and 3-B) which are distinguished by two non-reservoirs (1-N and 2-N).Furthermore, the results have indicated high levels of hydrocarbon saturation, permeability and porosity in certain degrees of formation particularly in unit A.

Petrophysical Assessment of the Cretaceous Upper Qamchuqa (Mauddud) Formation, Khabbaz Oilfield, Northern Iraq