Tectonostratigraphic Framework and Depositional History Pattern of the Cretaceous Successions Period in Southern Iraq

Twenty oil wells were selected to study the tectonostratigraphic of Cretaceous in southern Iraq, order develop a comprehensive description petroleum system region. That was conducted through an interpretation technical reports and available information wells, which include sedimentary, stratigraphy, tectonic reports, reservoir studies Cretaceous. Stratigraphically, third cycle identified succession also comprises seven half cycles fourth order. Eight genetic stratigraphic sequences identified, as well eight maximum flooding surfaces. The concept boundary (TSB) unit (TSU) has been adapted this study. In present study, period Iraq considers one (TSS) consisting four main categories. Each category consists set or group secondary units; these are TSU1A, TSU1B, TSU1C, TSU1D-TSU2A, TSU2B-TSU3A, TSU3B, TSU3C-TSU4A, TSU4B, TSU4. These units separated by five boundaries presented from TSB1 TSB5 Sulaiy, Shuaiba, Mauddud, Khasib, lower part Tanuma, Shiranish. lateral extensions TSUs that close passive margin (northeast area) hydrocarbon reservoirs. far (southwest generator source. intermediate unite is characterized both source hydrocarbon. Vertically, improved properties with reduced depth due lack compressional force, leads forming good primary porosity. transfer north south area represents trend improvement characteristics for same reason mentioned previously. Finally, TSB more than reservoir.