Document Type

Original Study


Sadi reservoir in the Halfaya field is a limestone reservoir and its significant mineral content is calcite in southern Iraq. The geological model is developed to identify facies, distribute petrophysical characteristics, and estimate the volume of hydrocarbon in place. When the data processing using Interactive Petrophysics (IP) software is complete, and the permeability reservoir is determined using the hydraulic unit technique, the geological model is built in three phases, beginning with building structural, facies, and property models. The reservoirs were separated into five zones (three reservoir units and two non-reservoir units) based on variations in petrophysical parameters (porosity and permeability) due to IP software interpretation. The geological model uses five wells that reach the lower Cretaceous Formation (Sadi reservoir). Unit B2 is a zone with good petrophysical properties such as 17.6% porosity, permeability (0.01-2 mD) and water saturation 25%, net to gross 78%, while unit B3 has higher permeability (0.3-13 mD) and porosity about 15.5%. The initial amount of oil in situ is expected to be 4.176*109 STB. Finally, 3D geological models improve in enhancing and estimating hydrocarbon potentialities in oil fields, hence increasing field production.