CGG Gippsland Marine Seismic Survey

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Activity name
CGG Gippsland Marine Seismic Survey
Activity types
Seismic survey
Submitted by
CGG Services (Australia) Pty Ltd
Submission date
07/09/2018
Submission type
New
Status
Accepted
Decision date
25/02/2019
Related documents
EP Summary (pdf 91 MB)

Location map (click to enlarge)
A658215
Progress bar
Submission
Assessment
Final decision
EP summary published
Activity started
Activity stopped
End of operation of EP
Activity events
Event Event date Next event* Next event due* Related documents
Submission of new EP 07/09/2018 NOPSEMA decision 08/10/2018 Not applicable
Not reasonably satisfied – opportunity to modify EP 08/10/2018 Titleholder action 07/11/2018 Decision notification (pdf 763 KB)
Extension of timeframe 08/11/2018 Titleholder action 03/12/2018 Not applicable
Extension of timeframe 03/12/2018 Titleholder action 10/12/2018 Not applicable
Resubmission of EP 10/12/2018 NOPSEMA decision 09/01/2019 Not applicable
Unable to make a decision within 30 days – request for further information 24/12/2018 Titleholder action 23/01/2019 Not applicable
Extension of timeframe 22/01/2019 Titleholder action 30/01/2019 Not applicable
Submission of further information 24/01/2019 NOPSEMA decision 25/02/2019 Not applicable
Acceptance of EP 25/02/2019 Not applicable Decision notification (pdf 178 KB)
Publication of other document 25/02/2019 Not applicable Statement - Key Stakeholder Matters Report (pdf 258 KB)
Publication of EP summary 25/02/2019 Not applicable Accepted Environment Plan (pdf 91 MB)

* The next event is based on NOPSEMA’s understanding and expectation of what may occur next in the assessment process. There are a number of other events that may occur, and events may happen sooner or later than expected. All events will be published in this table as and when they take place.

Activity description

CGG Services (Australia) Pty Ltd (CGG) proposes to acquire a multi-client 3D marine seismic survey (MSS) in the Gippsland Basin offshore Victoria. The Gippsland MSS is located in Commonwealth waters approximately 13 km east of Victorian mainland at its closest point, extending out to deep offshore waters approximately 125 km offshore. The Gippsland MSS comprises acquisition of seismic data in an Acquisition Area of a maximum area of 11, 161 km2, within a larger Operational Area of approximately 13,421 km2. The water depths within the acquisition area range from a minimum of approximately 43 m offshore from Ninety Mile Beach to 3,345 m in the Bass Canyon. The operational area is for sail line run-ins and run-outs (required to obtain full coverage), soft starts, streamer deployment / retrieval and maintenance, and line turns. 


The Gippsland MSS comprises 5 zones, each taking a maximum of one month to complete. Each zone is numbered and the order of acquisition will be determined based on advice from the CGG Gippsland MSS Scientific Advisory Committee, with the order arranged so as to minimise impacts to fishing operations, sensitive receptors such as migrating whales and spawning fish. The orientation of the survey sail lines in each zone are aligned ESE and WNW directions.


The seismic survey vessel will traverse a series of pre-determined sail lines within the acquisition area at a speed of approximately 4.5 to 5 knots. The source array will have maximum volume of 3,000 cubic inches which will be reduced to <150 cubic inches over South East Reef due to its importance for commercially important fish and invertebrate species as identified from stakeholder consultation. The sub-arrays will be fired alternately, with a shot point interval of 12.5 m. The seismic vessel will tow 8 to 12 solid streamers, with a maximum length of 7,050 m. Streamer spacing will be 50 to 100 m and sail lines will be spaced 450 to 1,000 m apart. The source array will be towed at approximately 6 m below the sea surface, and streamer tow depth will be 6 to 18 m.
Undershooting may be undertaken over a 25 km by 3 km area around a number of platforms within the survey area (up to ten platforms depending on client requirements). During undershooting, a secondary vessel with a similar seismic source will be positioned parallel to the main survey vessel. Each source will fire every 50 m, alternating between the two source vessels, so there is still 12.5 m between shot points, i.e. the vessels will not be firing simultaneously. Hence the amount of sound being produced is the same as for conventional data acquisition. Each undershoot will take between 18 and 54 hours.
The commencement date of the Gippsland MSS is yet to be decided. The duration of the activity is a maximum of 6.5 months and will be conducted between early March 2019 and end of July 2020, with avoidance of the period from beginning of August to the end of December. The 6.5 month duration is a conservative estimate and allows for some downtime due to weather, avoiding conflicts with other users and marine megafauna, and maintenance.

Regions
Gippsland
Commonwealth waters adjacent to
Victoria
Titles (or other instruments)
CLH6QH
Contact

Mark Stanley

Regional Geoscience Manager MCNV

Level 1, 1 Ord Street

West Perth WA 6005

08 9214 6200

mark.stanley@CGG.com

Reference
4619

*Where an environment plan was submitted or accepted prior to 28 February 2014 certain information is not published, in accordance with the Environment Regulations in place at that time. For accepted EPs, refer to the attached EP Summary for additional information.