Hartha Reservoir Quality in East Baghdad Oilfield, Iraq: An Overview and Accurate Prediction

Abstract

Hartha Formation was studied in East Baghdad oilfield, in Baghdad governorate. Lithologically, Hartha formation contents porous limestone, high porosity limestone, compacted limestone and less quantities of shaly limestone throughout the whole sequence in all studied wells (EB1, EB3, EB5, EB6 and EB7). The upper conformable contact with Tayarat Formation and the lower contact is an unconformable with Saadi Formation. The selected well divided into three reservoir units represented by unit A, unit B and unit C based on well logs study which splitted into three insulating units (Barr 1, Barr 2, and Barr 3), as well as a higher unit represented by cap rock unit (CRU). All studied wells exhibit a good porosity values. The best reservoir unit is a unit C, which included higher of movable oils and it has high porosity values reach to more than 25%. The best well in current study is a EB1 due to it has very good reservoir quality, represented by unit A, unit B and unit C, as well as it has high value average of porosity reach to more than 25%. The movable oil is existed in all reservoir units of EB1.