The studied succession is deposited during late Berriasian-Aptian interval, which is represented by the Zubair, Ratawi, Yamama formations. The present study includes stratigraphic development and basin analysis for 21 boreholes (Rachi-1, 2; Rifaei-1, Diwan- 1; Ratawi-1, 2; Halfaia-5; West Qurna 12, 15; Nahr Umr-7,8; Zubair-47,49; North Rumaila- 72, 131, 158; Suba-7; Majnoon-2, 3 and Luhais-2, 12) distributed within 13 oil fields in the southern Iraq. The back-stripping process determined the original direction of basin depocenter for the studied succession. The Yamama basin in the study area stretches from southeast to southwest with single depocenters, it was located in the southeast of the study area near wells Mj-2, Mj-3.NR-8 and WQ-15 and stretched to the new position southwest near wells NR-7, RU-131, RU-158, ZB-47 and ZB-49. The Ratawi Formation is represented by one depocenter located in the southwest of the study area near wells Rc-1, Rc-2, Lu-12 and Ru-72. The Zubair basin in the study area has two depocenters, the first depocenter is located to the north of the study area near well Dn-1, while the second one is located at the northwest area near wellsSu-7, Lu-12, Rc-1, RC-2 and Rt-1.
