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Summary
The North West Shelf, situated in the north-west of Western Australia, is a world-renowned offshore hydrocarbon province with investments of more than A$200 billion to date. However, the quality of the legacy seismic often suffers from severe residual multiple, limited bandwidth and poor S/N ratio within the reservoir level. This is mainly due to the existence of a complex shallow overburden with a strong water bottom, tertiary carbonates and channel systems.
With the recent advancement in seismic imaging technologies, it is now feasible to mitigate these challenges through high-end reprocessing. In this paper we will demonstrate how a tailored processing flow was applied on a development project on the North West Shelf. The key technologies that we will review here are (1) demultiple workflow with 3D curvelet domain subtraction, (2) hybrid Tomo-FWI velocity model building, and (3) Least-Squares Q Pre-SDM (LS Q-PSDM). The application of these high-end technologies significantly improved the quality of the final imaging, which helps with reducing uncertainties and minimizing risk in the field development.