Microfacies and Depositional Environment of Kometan Formation within Sequences (Turonian-Lower Campanian) in Bai Hassan Field/Northern Iraq

The present study included the study of the microfacies and the depositional environment of the Kometan Formation within the sequences of the (Turonian- lower Campanian) cycle in three subsurface sections within a dome of Kithki represented by the first section (BH-52) with a thickness of (151) m, while the second is represented by a section (BH-81) with a thickness of (188) and the third (BH-96) and a thickness of (144) m. The rocks of the formation under study consist mainly of overlapping layers of hard gray limestone, hard dolomitized limestone, shally limestone and marly limestone of medium hardness in the lower and upper units and of a lamination grey limestone of medium hardness in the middle unit, and the study showed that the sequences of this cycle are conformity with lower Gulneri Formation and upper contact with Mushorah Formation. The petrographic study of the formation rocks showed the diagnosis of three main microfacies and five secondary submicrofacies which the formation environment was deduced from the Toe of slope to the deep basin sea.