Petrophysical properties and hydrocarbon potentiality of Balkassar well 7 in Balkassar oilfield, Potwar Plateau, Pakistan

The Balkassar Oilfield is located in the eastern Potwar sub-basin, and lies on the Soan Syncline southern flank of the Himalayan collisional regime. In this study, petrophysical properties of reservoir rock of the Chorgali Formation of Eocene age encountered in well 7 of the Balkassar Oilfield were evaluated for reservoir rock potentiality. A set of wireline logs containing neutron, density, gamma ray, spontaneous potential and resistivity logs of well 7 from Balkassar Oilfield were interpreted carefully to estimate porosity, water saturation and hydrocarbon saturation. The method used for this petrophysical analysis is spontaneous potential logs in calculating water resistivity followed by Archie’s equation to convert water resistivity to water saturation. Based on the petrophysical analysis performed on the Balkassar well 7, the results show that about 21.1% average porosity, 33.5% water saturation and 66.5% hydrocarbons saturation were obtained for the Chorgali Formation. Thus, this indicates that Chorgali Formation has an average to good reservoir potential.