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It is evident that the possibility of having these latter velocities during the well-drilling itself would enable an innovative control of the results.
Among the possible input data, the stacking velocities with recording systems in the well which use the sound produced by the rock bit as a source of acustic energy are those which allow the best integration with the migration velocities.
It is known, on the other hand, that the complex sedimentary and tectonic processes can cause more or less significant variations in the lithologies and consequently in the velocities.
The new resulting seismic image, which is more reliable as it is precisely calibrated to the first part of the hole already completed, enables a better definition of the horizons below the rock bit and therefore control of the subsequent drilling phases and more accurate decisions of technical and economical importance.