Woodside Energy Ltd proposes to conduct a series of Geophysical and Geotechnical (GPGT) Survey Program which will collectively form the Petroleum and Greenhouse Gas Activities Program. The GPGT Survey Program is proposed to be undertaken to support future activities within multiple title areas, including the Goodwyn A (GWA) infill development, plug and abandonment (P&A) activities at various wells and future exploration activities for greenhouse gas activities and petroleum activities.
Woodside plans to collect high resolution geotechnical and geophysical data to inform the design of flowlines and umbilical routes, design of subsea structure foundation locations and planning for mobile offshore drilling unit (MODU) anchoring or jack-up location associated with the GWA infill development, P&A activities and future exploration activities.
The GPGT Survey Program is proposed to be located on the NWS adjacent to Woodside's GWA platform and North Rankin Complex, approximately 32 km from the nearest shoreline (Montebello Islands) and approximately 123 km to Dampier on mainland WA.
At least two project vessels will be required to complete the activities associated with the GPGT Survey Program. One that is capable of conducting geophysical surveys (such as a multi-purpose project survey vessel) and one to undertake geotechnical surveys (such as a geotechnical drilling vessel). There may also be times where a smaller geotechnical survey vessel is required to undertake surveys along proposed pipeline routes.
Geophysical and geotechnical survey(s) within the OA may use the following survey equipment:
• Multibeam Echo Sounder
• Side Scan Sonar
• Magnetometer
• Sub Bottom Profiler (SBP) (Boomer/Sparker and/or Chirp)
• Box cores/grab sample
• Piston/Gravity/Vibro cores
• Drilling core holes
• Cone Penetrometer Test
The GPGT Survey Program is anticipated to commence from Q1 2026 and is forecast a total of approximately 18 weeks to complete with vessels operating 24 hours a day. It is possible that the GPGT Survey Program will not be undertaken in a single campaign and the approximately 18-week activity may be split over the five-year period of this EP. Timing and duration may be subject to change due to project vessel availability, unforeseen circumstances and weather.
The GPGT Survey Program could also occur at any time throughout the year and therefore this EP has assessed risks relevant to geophysical and geotechnical survey activities in all seasons to provide operational flexibility on project schedule changes and project vessel availability.
