Depositional and Sratigraphic Evolution of the Early-Middle Miocene Succession in Hamrin, Ajeel and Mansuriyha Oil Fields, Central Iraq

The Early-Middle Miocene succession in Iraq is represented by the Serikagni, Euphrates and Dhiban formations, which deposited during Early Miocene. Jeribe Fatha successions were Middle age. This study includes microfacies analysis, depositional environments, sequence stratigraphy basin development of – middle Hamrin Ajeel oil fields Mansuriyha Gas Field. area four boreholes three located central Iraq: (Hr-2) (Aj-13, 19) feilds, (Ms-2) Five facies associations distinguished within studied fields: deep marine, slop, platform-margin, open restricted interior platform, evaporitic platform. interpreted based on texture fauna. Deep marine association consists planktonic foraminifera wackestone, it was observed well Ms–2. Slope environment Formation Hamreen-10, bioclastic mudstone wackestone. all wells particular mudstone-wackestone, peloidal wackestone-packestone foraminiferal wackestone- packestone. While platform dominated wells, ooidal packstone, dolomitic lime mudstone, dolomititic wackestone-packstone. In Ajil Oil Field consisting two sequences (C1 C2). fist (C1) started with transgressive system tract (TST) reflected occupies lower part Formation, TST bounded below SB above MFS. second (C2) Field, this thin as C1 toe slope occupied a bit Formation. highstand (HST) divided to five cycles (CE1, CE2, CE3, CE/Dh CDh). Sequence C2 relatively environment. Two are Mansuriya SB1 MFS corresponding conformable boundary that separated between Serikagni Dhiban. Contrary, parts