Description:The interpretation study which is presented has been carried out on the Silurian-Khuff Petroleum System, to verify a hydrocarbon dysmigration and redistribution concept which was developed by some authors in the past for the Fars domain. Considering that the Silurian source rock layers have probably worked in the Qatar-Iran area as well as in North Africa (Tanezzuft formation) and other places in the Middle East platform (Qusaiba formation), we have tried a qualitative and quantitative approach of the timing of this generative system at a more extended mega-regional scale. Method and Results: At first we attempted a reconstitution through time of the geometry of the area extending between the Qatar Arch and the Fars area further to the north. This work has been performed by using the available seismic in house complete data set. Different seismic horizons were calibrated, picked and mapped at this mega-regional scale, including a rigourous time-depth conversion because of some significant seismic velocities variations. Isobath and isopach maps were built after this first interpretation phase and used to determine how have evolved the top Khuff geometries at different times and particularly during what we consider as the critical moment of the Silurian-Permian Petroleum System
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