Reservoir Characterization of Pila Spi Formation (Middle–Late Eocene) in Shaqlawa and Shekhan areas, Kurdistan Region, Northern Iraq

This study investigates reservoir quality for the Middle–Late Eocene Pila Spi Formation in Shaqlawa (Sarkand) and Gulley Keer (Shekhan) areas Kurdistan Region of Iraq. Lithologically, studied sections is composed limestone, dolomite, dolomitic chalky marl. The thickness formation about 102m 200m Sarkand Gully respectively. In order to evaluate characterization formation, different techniques such as a microscopic core plug analysis were used. characterized by several pore's types namely; vugs, moldics, channels, interparticles, fractures, boring, fenestral, intragranulars. Several diagenetic processes also recognized dolomitization, pressure solution, stylolization dissolution. Based on petrographic study, lower part section has porosity average 8%, while it an 21% 17% middle upper parts. section, values are 9%, 17, 19%, lower, part, Scanning Electron Microscope (SEM) shows almost same values, sizes between micropore mesopore sections. Furthermore, results plugs roughly agreement with optical assessments since measured from 18.5%, 18% parts, parts 2.5%, 17.25%, 22.5%, Consequently, revealed that good except part. regards permeability, permeability displayed avenge 0.109md 0.6698md respectively which suggested fair permeability.