The Sahmah field in Oman has been a significant hydrocarbon producer since its inception in 1980, utilizing the prolific Gharif formation. This study evaluates and locating the remaining oil within the Gharif formation reservoirs of the Sahmah field. The Gharif Formation in the Sahmah field consists of four distinct reservoir units: the Upper Haushi Sand (UHS), Dolomite Drain (DD), Sandstone Drain (SD), and Lower Haushi Sand (LHS). To assess these reservoir units, wireline logs collected from 24 wells were analyzed comprehensively. These logs provided insight into lithology, shale volume, porosity, fluid saturation, fluid contacts, and permeability. Porosity and permeability values were derived from porosity logs and matrix density, cross-validated with core data to ensure accuracy and reliability. This study proposes using a water saturation height function to estimate the initial water saturation within the reservoirs. The estimated volume of hydrocarbon in place was determined to be approximately 263 million barrels, emphasizing the significant remaining potential within the Sahmah field. To better understand the distribution of the remaining oil, a reservoir simulation was conducted. The simulation results revealed promising indications that some oil may still be present in the upper sections of the reservoir structures or in areas characterized by low-quality reservoir conditions. Specifically, the UHS reservoir exhibited low oil recovery rates due to its inherently low-quality reservoir characteristics. However, in the DD reservoir, high oil recovery rates were observed, with the identification of two domes containing substantial remaining oil that could potentially be extracted through the implementation of new production wells. The SD reservoir displayed good reservoir quality in its northwestern region, while its southeastern part exhibited relatively lower reservoir quality. Nonetheless, oil extraction from all wells within the SD reservoir proved effective. The LHS reservoir, noted as the highest quality reservoir in the Sahmah field, showcased exceptional porosity and vii permeability characteristics. However, premature water breakthroughs resulted in the abandonment of some wells before extracting all recoverable oil. The simulation results strongly suggest that the LHS reservoir remains incompletely depleted, presenting a compelling opportunity for further oil extraction by drilling new wells. The methodology and findings of this research provide invaluable insights and knowledge for future exploration and production endeavors in the Sahmah field. By comprehending the remaining oil distribution and understanding the reservoir characteristics, operators can optimize their extraction strategies, potentially leading to increased oil recovery and enhanced operational efficiency within the field.