The super-giant Kirkuk field lies in north Iraq, near the town of Kirkuk. The field is an elongated, northwest-southeast oriented structure over 100 kilometers long and up to 4 kilometers wide. The field comprises three domes. From the northwest these are the Khurmala, Avanah and Baba domes. An additional dome, named Zab, further to the northwest, was thought to be the fourth dome of the Kirkuk field but has been shown to be a separate structure.
The Baba and Avanah domes, separated by the Amshe saddle, comprise the original and intended field development. Development of the Khurmala dome was planned in the 1980s but was postponed and activity there has only recently resumed.
Four reservoirs have been developed in the Kirkuk field. Extensive fracturing has caused the Jeribe and Euphrates formations to be in communication with each other and the Kirkuk group, creating a single reservoir of Oligocene to Miocene age known as the Main Limestone. The Kometan and Mauddud formations are also considered to be a single reservoir. The remaining two reservoirs in the field are the Maastrichtian Shiranish and Aptian Shu’aiba formations.
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