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Activity - Yoorn-1 Geophysical Survey Environment Plan (State and Commonwealth Waters)

Activity details
Organisation Santos WA Northwest Pty Ltd
Activity types Other survey
In-force EP 5191
Submission date 10 March, 2020
Outcome Accepted
Acceptance date 03 June, 2020
Locations North West
Start date 11 October, 2021
Stop date 19 October, 2021
Please note: activity start and stop dates are based on notifications provided by the titleholder.

Titleholder contact

Activity Description
Santos WA proposes to conduct exploration drilling in permit area WA-499-P, located in Commonwealth waters. As part of the drilling preparatory work, a vessel-based site survey will be undertaken involving geophysical survey techniques to assess the shallow seabed soils suitability to provide a safe foundation for a jack-up mobile offshore drilling unit (MODU). The survey activity (‘the activity’) which is the subject of this environment plan (EP) will involve surveying the planned drilling location and tie-in lines extending from the proposed drilling location to existing data points in the nearby area. The survey tie-in lines intersect both Commonwealth and state waters.
The survey will be undertaken using multi-beam echo sounding (MBES) and side-scan sonar (SSS) data to define the bathymetry / seafloor morphology. Identification of any hazards that may impact the location of a MODU through sub-bottom profiling (SBP) and grab sampling or drop cores for ground-truthing the surficial geophysics and to support MODU spud-can penetration assessments.
The operational area overlaps permit areas WA-499-P in Commonwealth waters and TL/5, TP/8 and TP/27 in State waters. Water depth in the operational area ranges from approximately 40 m to 50 m. The activity will take place in 2021-2022. Allowing for potential down time, for example due to weather or vessel operability issues, the activity may extend to up to 10 days. Activities will be undertaken up to 24 hours per day.
Location map (click to enlarge)
Location map - Activity: Yoorn-1 Geophysical Survey Environment Plan (State and Commonwealth Waters) (refer to description)

Accepted EP Documents

EP Document A730487 (6.63 MB)
OPEP Document A720844 (4.8 MB)