الملخص

The Kirkuk oil field is one of Iraq's large and old oil fields, as it was produced in the thirties of the previous century (twentieth century). The production of oil for long periods may lead to a decrease in the pressure of the hydrocarbon flow inside the wells, which may require development operations for these wells, and these operations require sufficient knowledge of the petrophysical properties, the most important of which is the porosity of rocks.The main objective of this study was to evaluate the proportions and types of porosity within the rocks of the Bajawan Formation, which is considered one of the oil-producing Tertiary formations in the Kirkuk oil field.In this study, twenty thin sections were analyzed as well as porosity logs for three wells (K-183, K-218, and K-246) drilled in the Baba dome, which is one of the three domes of the Kirkuk anticline.The results of the study showed that the proportion of porosity in the formation was relatively high, that there were multiple types of primary and secondary porosity, and that the effective porosity was close to the total porosity due to the low percentage of shale in the formation. The results of the study also showed that there are some limited areas that may contain gas.