In the Vienna Basin are located important hydrocarbon reservoirs, characterised by fractured rocks in a complex fault system. The pre-stack depth migration is a basic tool for identifying the major geological formations. This method is particularly effective when the necessary macro-model for the velocity field and layer interfaces is provided by seismic tomography. There is a trade-off, However, from the practical point of view: seismic tomography is more necessary for relevant complexities but, in such cases, the picking of traveltimes becomes extremely difficult, if not unfeasible. So a goal of our work was to verify the effectiveness of the tomographic imaging in this difficult area.


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