Crux Seabed Survey Environment Plan
|Activity type||Other survey|
|Submitted by||Shell Australia Pty Ltd|
|Submission date||15 July, 2022|
|Status||Under assessment (with NOPSEMA)|
|Link to previously accepted EP|
The Crux seabed survey will compose of a geophysical survey and a geotechnical survey with the objective to:
• investigate sub-seabed geological conditions at the proposed for the purposes of understanding conditions at the proposed pipeline pipelay initiation and the Pipeline End Manifold (PLEM) locations for the Crux pipeline;
• check geological conditions for proposed pipeline end terminations (PLET) foundations at both the Crux and Prelude ends of the proposed Crux pipeline;
• identify potential seabed debris and obstructions;
• identify and map the nature and distribution of seabed surface types along potential pipeline routes; and
• accurately measure water depth and map seabed topography.
The Crux seabed survey location is located in Commonwealth and Ashmore Cartier marine waters, 200 km offshore northwest Australia and 460 km north-north east of Broome, in 160m to ~260 m from Mean Sea Level (MSL) water depth.
The activity duration is expected to take 1 week. For planning purposes of this EP, the survey is considered to take up to a worst case 30 days which accounts for unforeseen circumstances and potentially more survey activities. The window for completing the survey is currently planned to occur in a single campaign between 15th July 2022 and 31st December 2022.