Modeling and Characterization of the Zubair Reservoirs in the Tuba Oil Field, Basra Governorate, Southern Iraq.
Abstract
The research investigates the units and reservoir characterization of the Zubair Formation in the Tuba oil field, Basra Governorate, southern Iraq, Gamma ray log, compensated neutron log, compensated formation density log, self-potential log, and resistivity logs are utilized, analyzed the data to determine average porosity, water saturation, hydrocarbon saturation and specific yield to shale volume. Ten reservoir units are identified based on these parameters. Porosity, permeability, and fluid types are calculated for each unit. Additionally, it is concluded that the best unit containing hydrocarbon is the unit (Zu-8). Then (Zu-4) and some units give high water saturation, such as unit (Zu-6). Unit (Zu-7) contains the highest porosity rate at the TU-Z well, but the volume of hydrocarbons is not necessarily the best. A reservoir model for these units is constructed and compared with other models. The study of the area's rocks exhibits characteristics favorable for high oil yield, including high porosity, permeability, hydrocarbon saturation, and minimal shale volume. This facilitates easy oil extraction without requiring costly additional treatments.
