This thesis presents a detailed 3D static modeling study conducted in the Mazkhour field, located in the north-western region of Oman, with a primary focus on the Upper Shu’aiba reservoir. The main objective of this research is to construct a geostatic model utilizing recently acquired data, specifically aimed at identifying and characterizing reservoir features. The Upper Shu’aiba reservoir is characterized by a succession of clinoforms that prograde from the SW to SE, deposited during a regressive sea cycle within the Bab basin. The reservoir units within each clinoform exhibit a consistent sequence of facies. Notably, the proximal part of the clinoform emerges as the most favorable, housing reservoirs with high porosity and medium permeability. Moreover, intraformation seals, primarily composed of argillaceous deposits, effectively isolate the distinct clinoforms into individual reservoir units. A key aspect of the study involves the stratigraphic correlation that identified three main reservoirs within the clinoforms (i.e., A, B, and C). The research reveals that the proximal part of the clinoform exhibits superior reservoir quality compared to its distal counterpart. The static modeling results validate the stratigraphic findings, illustrating higher porosity and notable variations in water saturation within the identified reservoirs. The culmination of these analyses enables a comprehensive estimation of oil in place through volumetric calculations. This research contributes valuable insights into the reservoir characteristics of the Upper Shu’aiba Formation in the Mazkhour field. The 3D static model enhances our understanding of the spatial distribution of reservoir properties.