Reservoir characterization of the Dokan and Gulneri Formations (Upper Cretaceous) from selected wells in Khabbaz Oil Field, Kirkuk area, Northern Iraq

Volume 20 , Issue 2 , June 2018 , Pages 109-128

Authors

¹ Department Geology, College of Science, University of Sulaimani, Kurdistan Region, Iraq

The evaluations of reservoir characterization for Cretaceous Dokan and Gulneri Formations

have been selected for this study in Khabbaz Oil Field- Northern Iraq. The Cenomanian

Dokan Formation is an open marine oligosteginal limestone ranged in thickness between 21

and 29 meters in this field, and it is overlain by 11 to 14m thick of Gulneri Shale Formation,

both are underlying by the thick rock unit of Qamchuqa Formation (Mauddud and Shu'aiba).

The full set log data for the seven wells of (Kz-1, Kz-3, Kz-4, Kz-5, Kz-11, Kz-14, and Kz-

16) were available, also some general data derived from the wells (Kz-2, Kz-6, Kz-7, Kz-8,

Kz-9, Kz-10, Kz-12, Kz-13, Kz-15, and Kz-21). The log data have been used in evaluating

the reservoir properties of the two rock units. The detected lithologies from Neutron-Density

combination log showed that Dokan Formation is mostly limestone dominated, and the

Gulneri Formation is shale rock. From the log data different type of reservoir properties (clay

content, porosity, fracture index, and gas crossover) have been estimated. Additional core

sample measurements (capillary pressure, porosity, permeability, and thin sections) were used

for supplementary analysis.

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