Sedimentary and Microfacies of Chia Gara Formation in the Well Qara Chuq 1, North Iraq. PDF

Keywords

Iraq, Chia Gars formation, limestone, shale, Qara Chug well(1), radiolarian, silty, dolomitic, biodastic packstone

Abstract

Chia Gara Formation (Upper Jurassic- Lower Cretaceous) in the well Qara Chuq 1 Northern of Iraq is composed of two main lithologic components, the limestone and shale. The limestone suite which is the most abundant is characterized by its dark color and is composed of two sub facies, lime mudstone and packstone. The lime is composed of three sub facies mudstone facies radiolarian lime mudstone, silty lime mudstone and dolomitic lime mudstone. Lime packstone facies is composed of two sub facies: radiolarian packstone and bioclastic packstone. The shale suite that is rich with hydrocarbons was seen interbedded with radiolarian lime mudstone sub facies in some horizons. Litho and microfacies of Chia Gara Formation indicate that the sediments of this formation were deposited in a deep water formation, quiet and reducing depositional environment.