Calibration of a 3D PSTM Velocity Cube - Applied Workflow and Results Discussion

A velocity calibration has been performed using a 3D PSTM velocity cube and 600 well time/depth curves. The purpose was twofold: to perform the quality control of the data and measure the added value of the seismic data integration to obtain a velocity model. This model was then used to convert 3D seismic to “depth” in order to better identify smaller structures not visible in the time domain. Therefore two velocity models have been obtained; one using only the wells information, the other integrating the seismic velocity. These two velocity models have then been checked and compared. The velocity models show rather large misties at wells. This is mainly explained by the filtering during the interpolation of a small scale variability component that has been interpreted as artefacts. Finally, several perspectives that may help to reduce the misties have been discussed: as local geostatistics and flattening.