Even in a very mature field, if poor seismic imaging does not support well results, it can be very difficult to get a full understanding of the subsurface and a comprehensive picture of the targets. In the case history presented hereinafter, we show that by the use of an integrated approach, based on the customization of the re-processing sequence and the depth imaging workflow, it was possible to improve the structural imaging of the deeper formations and to mitigate the geophysical risk for exploration and development activity.
Through the application of pre-stack depth migration (PSDM), fed by a detailed anisotropic velocity model and a properly preconditioned input dataset, the stratigraphic picture within the Mesozoic sequences became more interpretable, where the vintage seismic volume was not able to explain the results of some recent wells: the application of cutting edge imaging technologies allowed an alternative mapping of the seismic facies penetrated by the wells and to perform accordingly a stratigraphic interpretation aimed at de-risking the subsequent exploration activity.
