oa Albian-Turonian Carbonate Ramp and Platform Evolution in the Al Shaheen Field, Offshore Qatar

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.