The College of Engineering at the University of Baghdad witnessed the public defense of the master’s thesis by Hayder Mahdi Ghargan, a student in the Petroleum Engineering Department. His thesis is titled:
“ Evaluation of Mishrif Formation in Garraf Oilfield Using Conventional and Optimization Techniques” supervised by the esteemed Assist. Prof Dr. Omar Falih Hassan.
The defense took place on Wednesday, September 4, 2024, in the Graduate Studies Hall of the Petroleum Engineering Department. The examination committee was composed of the following distinguished professors:
By the Hayder Mahdi Ghargan and supervised by Assist. Prof Dr. Omar Falih Hassan. The examination committee consisted of Prof. Dr. Manal Shaker Ali as Chairman and the membership of Assist. Prof Dr. Rwaida Kaiser AbdulMajeed and Lecturer Dr. Jihad Husain Al-Joumaa. The thesis was summarized as follows:
The Mishrif Formation within the Garraf Oilfield is a critical carbonate reservoir, essential to Iraq’s oil production. This study aimed to enhancing the accuracy of petrophysical parameter estimation for the Mishrif Formation in the Garraf Oil Field. The research involved the selection of seven wells. The study identified the Mishrif Formation as comprising five distinct zones: Barrier 1, Upper Mishrif, Barrier 2, Middle Mishrif, and Lower Mishrif.
The lithological analysis revealed that the Mishrif Formation is primarily composed of limestone and shale, with minor occurrences of dolomite, as confirmed through neutron-density and photoelectric effect (PE) versus porosity cross-plots. Multiple methodologies were employed to calculate shale volume and porosity, with gamma-ray logs proving most effective for determining shale volume and density logs providing the closest porosity estimates relative to core data. Archie’s parameters, derived through the Pickett plot method, The analysis produced parameters a=1.1, m=2.2, n=2.25, and Rw=0.019. These values facilitated a detailed evaluation of water saturation. The study further established cutoff values for porosity (0.11), shale volume (0.22), and water saturation (0.65) through classical methods and sensitivity analysis, which were pivotal in calculating the net-to-gross (NTG) for each zone. The Upper Mishrif demonstrated the highest NTG, underscoring its superior reservoir quality. followed by the Middle Mishrif and Lower Mishrif, while Barrier 1 and Barrier 2 were identified as non-reservoir zones due to their higher shale content and lower porosity.
Mineralogical optimization was achieved using the Quanti-Elan model, which allowed for precise characterization of the Mishrif Formation’s rock composition. Additionally, rock typing was conducted using the Integrated Self-Organizing Map (IPSOM) and Heterogeneous Rock Analysis (HRA), with HRA proving particularly effective in optimizing rock classification. The combination of the Lorenz plot, Flow Zone Indicator (FZI) method, and Rock Fabric Number (RFN) enabled precise definition of rock types and their lithological characteristics, contributing to a more accurate understanding of the reservoir’s heterogeneity and flow potential.
