The main aim of the present study is the characterization of the Qishn Formation in Sharyoof oil field locating within the Masila basin, by applying the 3D static modelling techniques. The present study was initiated by the seismic structural interpretation, followed by building a 3D structural framework, in addition to analysing well logs data. The results are then used for constructing 3D facies and petrophysical models. The Qishn Formation exhibits depth values within the range of 400-780 m below sea level in the Sharyoof oil field, with a general increase towards the SSE direction. It is dissected by a set of high dip angle normal faults with a general ENE-WSW trend. It is also folded as a main anticline with an axis that is parallel to the fault trend, formed as a result of a basement uplift. According to the facies models, the Qishn Formation comprises 43.83% limestone, 21.53 % shale, 21.26% sandstone, 13.21 % siltstone and 0.17% dolomite. The Qishn Carbonates Member has low porosity values making it a potential seal for the underlying reservoirs. While the Upper Qishn Clastics S1A and C have good reservoir quality and S1B has fair reservoir quality. The Upper Qishn Clastics S2 and S3 have also fair reservoir quality, while the Lower Qishn Clastics zone has good reservoir quality. The water saturation decreases towards the west and east directions and increases towards north and south direction. The total OOIP of the Upper Qishn clastics is 106 million STB within S1A, S1C and S2 zones. Drilling of development wells is recommended at the eastern part of the study area, exhibiting good trapping configuration, in addition to the presence of potential seal (Upper Qishn Carbonates Member) and reservoir (Qishn clastics Member) with high porosity and low water saturation.