Well Log Interpretation and Petrophysical Modeling to Evaluate Zubair Reservoir in North-Rumaila Oil Field

Abstract

This study uses well log interpretation and petrophysical modeling, which is one of the most influential tools for the evaluation of Zubair Reservoir in the X Oil Field. Understanding reservoir parameters and boosting output by picking the optimal location for future drilling candidates will be helped by these interpretations and modeling. 3D seismic and well log data were used to create and describe a petrophysical model in this investigation. Each parameter was upscaled when interpreting well logs and calculating petrophysical characteristics. The petrophysical model was created using geostatistical approaches such as Gaussian simulation, variogram, and Monte Carlo simulation. Techlog, Petrel, and HRS Software were used in this study. As a result, we analyzed porosity, shale volume, and water saturation for four wells named A, B, C, and C using a set of commercial software and applying the different well logs like; gamma-ray (gr) log, spontaneous potential log, porosity logs (Density Log, Neutron Log, and Sonic Log), and resistivity log. The range of porosity values is 0.23 to 0.30, the water saturation is around 10% in the crest and 60% in the flank, and Vsh is interbedded with sand and the value is decreasing 25% in the clean sand bed. This formation is characterized by clean sand and is interbedded with a sharp boundary. The sand in the main pay is characterized by homogeneous and uniform porosity patterns. The homogeneous nature of the sand leads to uniform saturation of water to fill this entire sand unit with oil and the absence of a transition zone.