Petrophysical Evaluation and Reservoir Characterization of the Lower Jurassic Mus Formation Using Wireline Logs: A case study from the Harir Oil Field, Kurdistan Region, Iraq

The Lower Jurassic Mus Formation is a significant hydrocarbon reservoir in northern Iraq. The interpretations of the petrophysical property using wireline logs play an important role in the reservoir characterization, providing key insights into lithology, shale volume, porosity, permeability, flow zone indicator, as well as water and hydrocarbon saturations. In this study, Petrophysical techniques were applied to evaluate the Mus Formation in the Harir oil field, Kurdistan region of Iraq. The analysis was wireline log data from Well JSK-1, using a suite of logs that consisted of Gamma Ray, Caliper, Density, Neutron, and Resistivity Logs to evaluate the petrophysical properties of the Mus Formation. The Mus Formation was determined from the subsurface with a total thickness of about 40m. The main lithologies include limestone, dolomitic limestone, dolomite, and minor sandstone fragments with minimal shale content. The average porosity within the pay zone was 10%, with a permeability of 400mD. The water and hydrocarbon saturation in the pay zone was 70% and 30% respectively. The total thickness of the reservoir rock was 40m, with a pay zone thickness of 2.1m. The findings indicate that the upper part of the Mus Formation shows a good reservoir quality, as evidenced by the presence of the pay zone and resistivity value of the formation. These results suggest that the Mus Formation contains an active hydrocarbon-bearing interval and the potential to contribute to the future hydrocarbon exploration and production in different oil fields of northern Iraq.