Derisking Hild Field Development Through Wide-Azimuth OBC and Multi-Azimuth Streamer Depth

The development of the Hild field in the North Sea has been left stranded for 30 years as a consequence of both structural complexity and a very poor imaging of the target Jurassic reservoirs. Today, an appraisal and development scheme has been worked out based on a fully integrated seismic processing project that started in 2005 with the acquisition of wide-azimuth 3D-4C OBC survey. In this paper, we present the different milestones of this work which consisted in the integration of all seismic datasets acquired on the area, three multi-azimuth streamer and OBC, into one pre-stack depth migrated volume. To start with, we show the details of the depth imaging project. Following a fast-track OBC PSDM, a new VTI velocity model has been constructed with all azimuth information available from the 4 datasets. The latter is further used to depth-migrate all datasets and stack them into a combined volume for interpretation. The resulting uplift of the reservoir imaging is then discussed and its consequence on the field understanding and appraisal strategy is detailed.