Microfacies Analysis and Diagenesis Processes of Mauddud Formation in Selected Wells from Ratawi Oil Field, Southern Iraq

Abstract

Mauddud Formation was studied in Ratawi oil field, Southern Iraq to determine the depositional environment and effective diagenesis processes.The lithology of the formation is limestone in all studied wells (Rt-2, Rt-4, Rt-17 and Rt-19).lower contact of Mauddud Formation with Nahr Umr Formation is gradational, but the upper contact is unconformable with Ahmadi Formation.In this work, 114 thin sections were examined and showsfour microfacies (wackestone, packstone, grainstone andargillaceous mudstone), which depositedin the Inner-Mid to Outer ramp environment. The most significant diagenesis processes were micritization, dissolution, cementation, compaction, and dolomitization, which had an impact on the texture and porosity of the Mauddud Formation.