The Diagenetic Processes History of Kometan Formation (Upper Cretaceous) in Azmir Anticline, Sulaimani Governorate, NE Iraq

In This research, the effect of diagenesis processes has been examined on the Kometan Formation, a fractured carbonate petroleum reservoir in the northern Iraq, that dates from the Upper Cretaceous period., and is located within the tectonostratigraphic megasequence known as AP9 on the Arabian plate. The main objectives of this study involve examining the impact of different diagenetic processes on the Kometan Formation. This investigation is based on the analysis of twenty thin sections by using a polarized microscope, all collected from a specific region on the southwestern side of the Azmir anticline, located in the northeastern vicinity of Sulaymaniyah City. This study identifies several diagenetic processes that have influenced the Kometan Formation, including micritization, dissolution, cementation, neomorphism, silicification, compaction, fracturing, and pyritization. These processes have taken place across three diagenetic environments: marine phreatic, meteoric, and burial. Diagenetic processes of Kometan Formation are particularly prominent in burial and common in meteoric setting, and relatively rare within the marine phreatic conditions. These processes are classified into three distinct diagenetic stages: early (eogenesis), middle (mesogenesis), and late (telogenesis).