Determining the Difference in Homogeneity between the Euphrates and Jeribi Formations in the Qayyarah Oil Field Based on Vertical and Horizontal Core Samples

  • Maan Hasan Abdullah Al-Majid Department. of Petroleum Reservoir Engineering, College of Petroleum and Mining Engineering, University of Mosul, Mosul, Iraq
Keywords: Permeability, Porosity, Homogeneity, Qayyara oilfield, Iraq


Permeability and Porosity are the important petrophysical parameters of the hydrocarbon reservoirs for petroleum production. In the Qayyara oilfield, vertical and horizontal core samples were collected from the Jeribe and Euphrates formations to perform various tests. An exponential relationship between porosity and logarithm of permeability for 123 vertical samples was derived and explained based on the compaction and shale size. The difference in homogeneity and shale size between the two formations was demonstrated by the coefficient of determination. A Log-Log plot between vertical and horizontal permeability was derived using vertical and horizontal core samples. An equation for predicting vertical permeability from horizontal one was produced. In the same way, a linear relationship between vertical and horizontal porosity was deduced and interpreted based on homogeneity. The ratio between the vertical and horizontal permeability was set to determine the degree of anisotropy at various depths.