Abstract
Shuaiba Formation is an important formation in Iraq, because of their deposition in the important period during the geological history of Arabian plate. The study is focused on a number of selected wells from several fields in southern Iraq, despite the many of oil studies to Shuaiba Formation but it lacks to paleontological studies. Four selected wells are chosen for the current study, Zb-290, Ru-358, R-624, WQ1-353, the selected wells are located within different fields, these are Zubair, Rumaila and West Qurna Oil Fields. In this study fourteen species followed to genus Hedbergella were discovered for first time as well as three genera followed to genus Heterohelix in the Shuaiba Formation at the different oil fields, Hedbergella tunisiensis Range Zone is suggested biozone to the current study, the age of this biozone is Aptian, most of the other genera located within this zone.
Highlights
1.1 Introduction The study was interested in an important age of geological history of Iraq, because of most of the
Four selected wells are chosen for the current study, Zb-290, Ru-358, R-624, WQ1-353 (Table-1) (Figure-1), the selected wells are located within different fields, these are Zubair, Rumaila and West Qurna Oil Fields
The Shuaiba Formation was first defined by Owen and Nasr in 1958, The Shuaiba formation was deposit during the lower Cretaceous (Aptian)
Summary
The Shuaiba Formation was first defined by Owen and Nasr in 1958, The Shuaiba formation was deposit during the lower Cretaceous (Aptian). The formation is comprised of massive limestone and it is grading into chalky limestone with shale in the top, it was deposit in an open marine environment [3]. Shuaiba Formation overlies of Zubair formation with conformable and gradational contact, while the upper contact is unconformable with Nahr Umr. Formation. The lithology and fossils of formation contain pseudo-oolitic limestone and Orbitolina cf. Discoidea Gras, Choffatella decipiens Schlumberger and globogerinids [4]
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