Petrophysical Properties of the Zubair Formation Units Using Well Logs of X Well, North Rumaila Oilfield, Southern Iraq

The Zubair Formation represents the main pay of the Rumaila oil field.
The determination and calculation of petrophysical properties are
essential for improving our understanding of the reservoir, identifying
potential economic opportunities, and reducing uncertainty in the
reservoir model to optimise all field operations. The interpretation of the
petrophysical properties of the Zubair Formation in the Rumaila oil field
is done using the well logging data of X well. The well logs data are
digitised using Neuralog software. The calculations and data
representation are done using Interactive Petrophysics (IP). The main
lithology of the Zubair Formation was identified as a sandstone with
thick and thin shale layers based on the mud logging report, NeutronDensity, and M-N cross plots. The volume of shale is estimated as
(25.35%) in X well. The interpretation of well logs data showed
excellent effective porosity and is very close to total porosity. The
average reservoir permeability in the X well is (416.8 mD). The
saturation calculations show that the Zubair Formation has good
accumulations of hydrocarbons, with an average oil saturation is 52.5%.