Faster play-based exploration, Petrel Sub-basin, Australia

Summary

The Paleozoic extensional Petrel Sub-basin within the Bonaparte Basin, Australia is relatively underexplored. Historical two-dimensional seismic data and 59 exploration wells provide a substantial residual subsurface uncertainty. Woodside’s WA-522-P exploration permit comprises 7806 km² on the western flanks of the Petrel Sub-basin in shallow-water (<150 m) that hosts proven oil (Turtle and Barnett fields). Furthermore, the Torrens-1 well located within this permit encountered Paleozoic oil shows (KUFPEC, 1994).

Polarcus, on behalf of Woodside, acquired the 2846 km² Zenaide three-dimensional seismic survey between February and April 2018. The aim of the survey was to better resolve the Paleozoic exploration potential within the north-eastern area of WA-522-P. Final pre-stack depth migrated data received in December 2018 followed preliminary (fast-track) seismic data received in July. This modern seismic data contributes to the polarisation of key subsurface uncertainties.

We report the application of an Agile approach to exploration delivering regional interpretation, gross depositional environment mapping, charge modelling and biostratigraphic analysis in support of play-based exploration attribution of risk and uncertainty prior to receipt of seismic data. Integration of play and prospect analyses will support faster portfolio maturation.

• Petrel Sub-basin
• play-based exploration
• Bonaparte Basin
• exploration portfolio
• Agile working