In offshore Qatar two sedimentary systems are distinguished in the Albian to Turonian interval. The stratigraphically older one comprises a low angle mixed marl/carbonate ramp system, corresponding to the Nahr Umr Formation and the lower part of the Mauddud Formation developed during the Albian. This ramp system is overlain by a carbonate platform to intrashelf basin system, corresponding to the upper part of the Mauddud and the Khatiyah Formations, of Cenomanian-Turonian age. The geometry and facies of the two systems are presented using data from core, thin sections, 3D seismic and age dating.


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