Abstract
Yamama Formation (Late Berriasian- Aptian cycle) is one of the main Lower Cretaceous carbonate promising reservoir in the Mesopotamian Basin, southern Iraq. The Yamama obviously is oil producing throughout Rumaila North, Zubair, Majnoon, West Qurna, NahrUmr, Nasiyria, Abu Khima, Rafedain, Samawa, and Luhais oil fields southern Iraq. Four crude oil samples and fifteen source rock extracts from Lower Cretaceous Yamama formation from Ratawi and other selected oil fields have been analyzed in Geomark Research Ltd in Houston-Texas using Gas Chromatography – Mass Spectroscopy (GC-MS), to get biomarkers ratio in the branched, cyclic, and aromatic fractions, and carbon e isotope analysis. In addition, thirty rock samples from the Upper Jurassic and Lower Cretaceous sequences, have been subjected to source rock analysis.
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