Reservoir characteristics of the Miocene age formations at the Allas Dome, Hamrin Anticline, Northern Iraq

Doaa T. Fadhil¹, Wafaa Anmar Yonus², Mustafa A. Theyab¹

¹University of Samarra, Samarra, 34010, Iraq

²Salahuddin Education Directorate, Tikrit, 34001, Iraq

Min. miner. depos. 2020, 14(4):17-23

https://doi.org/10.33271/mining14.04.017

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      ABSTRACT

      Purpose. This study evaluated the reservoir characteristics and determined the formation lithology of Dhiban, Euphrates, and Serikagni in the Hamrin wells (Hr-2 and Hr-9).

      Methods. The well logs have used the gamma ray log, the porosity logs, (density, neutron, and sonic logs), and the resistivity logs. The data were converted into digital values by using the Didger program. The formation lithology was determined on the basis of the density, neutron logs, and gamma ray log.

      Findings. Lithology consists of limestone, dolomite, dolomitic limestone, and marly limestone with the addition of anhydrite. Petrophysical characteristics, namely, volume of shale, porosity, water saturation, and hydrocarbon saturation were calculated and evaluated. The total volume of water and hydrocarbon for reservoir layers were also determined.

      Originality.Dhiban, Euphrates, and Serikagni the formations in the Hamrin field were divided into two potential units, depending on the petrophysical analysis of the well logs in reservoir unit – A(RU-A). Thus, the total thickness of the unit (86.25 m), and average porosity (0.14), the hydrocarbon saturation (0.11), and the volume of shale (14.25). While the Reservoir unit-B (RU-B). The total thickness of the unit (50 m), average porosity (0.09), the hydrocarbon saturation (0.26), and the volume of shale (49).

      Practical implications. The RU-A reservoir unit was characterized by high porosity and high hydrocarbon saturation regardless of the thickness in both wells.

      Keywords: limestone, oil, dolomite, petrophysical, Serikagni, Euphrates, Dhiban

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