University of Anbar - College of Science - President	Prof. Dr. Ali Mishaal Bad Hamad
University of Basra - College of Sciences - Member	Prof. Dr.  Fahd Mansour Saqr
University of Anbar - College of Sciences - Member	Assist. Prof. Dr. Abdul Hamid Abdul Mohammed
University of Anbar - College of Sciences - member and supervisor	Prof. Dr. Basem Fadel Latif

The aim of this study is evaluating the reservoir characteristics of the Jeribe-Euphrates formations units dating back to the Tertiary period within the Early-Middle Miocene cycle. It is the first study of its kind for the two formations within the Halfaya oil field, which is one of the important oil fields in Mesan Governorate. Qualitative analysis and quantitative interpretation of data from six wells distributed over the field structure were conducted, and three-dimensional geological models were prepared for the most important petrophysical properties of the two formations, through which the two formations were divided into two reservoir units (JE-1, JE-2). The results of the petrophysical evaluation and statistical analysis of the thickness, porosity and hydrocarbon saturation rates showed that the reservoir unit (JE-1) is the best in terms of reservoir properties, as it is distinguished by its thickness and a higher hydrocarbon saturation rate than unit (JE-2). Although the second unit has a higher porosity rate, its high-water saturation rates in some wells have negatively affected its reservoir quality. The reservoir evaluation models indicates that the preferred drilling locations are in the northern half of the field where the reservoir characteristics of both Units 1 and 2 are improving.