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Microfacies Analysis and Diagenetic Assessment of the Late Oligocene- Early Miocene Succession in Khabaz Oilfield, Northern Iraq

The Jeribe and Azkand formations, which were deposited during Late Oligocene-Early Miocene are a major reservoir interval in the Khabaz oilfield where it is, for the most part, a carbonate reservoir. The study area is located in the north of Iraq within the Foothill Zone. Through the thin-section examination for Azkand/Anah carbonates in the Khabaz oil field (Kz-3, Kz-4, Kz-10, and Kz-43), the petrographic and microfacies have been studied, which show six major carbonate microfacies, each of them is representing a distinctive deposition environment, and these are: restricted and semi-restricted for the Jeribe Formation, and semi-restricted, back reef, reef, fore reef, shallow open marine and slope for Azkand and Anah formations. There are several types of diagenetic processes; some of these processes enhance the porosity and the other reduces it. Porosity reduction by: Cementation (Isopachous, meniscus, syntaxial calcite, Drusy calcite, botryoidal, blocky calcite), Recrystallization; Compaction and late stage of dolomitization. This appeared near the upper and lower contact of the Jeribe Formation and in the lower part of the Azkand Formation. While the porosity enhancement which represented by depositional process (primary porosity) and dissolution (secondary porosity), in addition to the early and middle stage of dolomitization. This appeared in the middle part of the Jeribe Formation and the upper part of Azkand.