Microfacies and depositional environment of Bajawan and Baba Formations in Kirkuk Oil fields north Iraq

Abstract

The study of six selected wells from Kirkuk oil field petrographic and physical properties ; investigation while leads to interpret the microfacies and environment for Bajawan and Baba Formations. Five carbonate microfacies distingished from Bajawan Formation ( Lime Mudstone Microfacies, Fossiliferous Lime Wackstone Microfacies, Miliolid Packstone Microfacies, Miliolid Grainstone Microfacies and Coral, Boundstone microfacies ), while Two microfacies described from Baba Formation (Limestone bearing Larger foraminifera (Lepidocylina- Nummulites) packstone-wackstone microfacies and Fossiliferous Floatstone bearing Larger Foraminifera microfacies ).
 According to different types of microfacies that described from Bajwan and Baba Formations , the depositional environment of Bajawan Formation is backreef/reef or restricted lagoon (inner ramp), but for Baba Formation is shallow water forereef (middle ramp). The facies model were constructed on basis of stratigraphy, lateral and vertical facies change and depositional environment of Oligocene succession.