Note: Activity description and location map updated to reflect current submission (as at 13 June 2024).

TGS-NOPEC Geophysical Company Pty Ltd (TGS) proposes undertaking a three-dimensional multi-client marine seismic survey (3D MC MSS) in the Otway Basin, in Commonwealth waters offshore from Victoria, and Tasmania (referred to as the Otway Basin 3D MC MSS). The survey will provide 3D data coverage and improved subsurface imaging to provide an improved understanding of the subsurface, which to-date has been limited to sparse 2D coverage.

The Operational Area (OA) represents where all activities managed under the EP will occur and includes the Active Source Area (ASA). The OA is located ~45 km from land at the closest point. The ASA lies within the OA and is where seismic acquisition will occur. Smaller discrete surveys will be acquired within the ASA which covers ~31,500 km2; however, this entire area will not be surveyed. Water depths range from 97 m to 5,650 m.

The TGS Otway Basin 3D MC MSS will also include a ‘tie-in’ to existing geophysical data from previously drilled wells. Two tie-lines will extend onto the continental shelf; however, these tie-line require less than 24 hours acquisition. At the shallowest point, the tie-line is in a water depth of approximately 115 m and additional control measures will be implemented for this.

The TGS Otway Basin 3D MC MSS will commence following regulatory approval and will be completed by 30 September 2027. The total survey duration is 400 days or 15,000 km2 full fold data (whichever is reached first) with data being acquired over multiple phases within that period. The maximum duration of any survey phase within a 12 month period will be no longer than 200 days or no greater than a full fold area of 8,000 km2 (whichever is reached first).