This paper describes the seismic workflow for exploration in Block 11, offshore Qatar, from the decision to acquire a 3D<br>seismic survey, via processing, interpretation, time/depth conversion and reservoir characterization to positioning of wells. The<br>area is generally very flat in the morphology of the horizons and the targets are relatively shallow, therefore, the decision for<br>acquiring 3D seismic data had been taken rather late. It turned out to be a textbook example why 3D seismic is imperative<br>even in such generally flat areas. The structural history of the area, from the old basement lineaments up to the earliest<br>Cretaceous-Tertiary aged reactivation movements, could be outlined by 3D seismic data and it shows a very complex<br>structural pattern.


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