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Activity - Keraudren Extension 3D Marine Seismic Survey

Activity details
Organisation Santos WA Northwest Pty Ltd
Activity types Seismic survey
In-force EP 5092
Submission date 19 December, 2019
Outcome Accepted
Acceptance date 09 April, 2020
Locations North West
Start date 01 January, 2022
Stop date 18 February, 2022
Please note: activity start and stop dates are based on notifications provided by the titleholder.

Titleholder contact
Mike Giles
Phone: 08 6218 7100

Activity Description
Santos WA Northwest Pty Ltd (Santos), who are wholly owned by Santos Energy Limited, propose to undertake a 3D seismic marine survey (the ‘survey’) over a portion of exploration permit areas WA-435-P, WA-436-P, WA-437-P and WA-438-P, and surrounding waters in the Bedout Sub-basin in Commonwealth waters off the coast of Western Australia. At its closest point, the survey Operational Area is located approximately 45 kilometres (km) from the nearest land (Bedout Island), 56 km from the nearest mainland coastline and 141 km from the nearest regional town Port Hedland.

The survey data is required to develop regional geologic models to inform the exploration permit retention strategy, and the potential location of future drilling of exploration and development wells.

Seismic acquisition will be via methods and procedures similar to other seismic surveys conducted in Australian waters. The seismic survey vessel will travel along a series of pre-determined lines towing cables (known as streamers or acoustic receivers) which contain microphones (known as hydrophones). As the survey vessel travels along the lines, sound waves will be directed down through the water and into the geology below the seabed. The sound that reflects back is measured by the hydrophones and is later processed to provide information about the structure and composition of geological formations below the seabed.

The survey may be acquired in stages. The exact area to be acquired in each stage will be determined based on operational and timing factors, and in consultation with key stakeholders.

Santos confirms that no seismic surveys will be acquired in 2020. It is Santos’ intention to acquire the full survey within 2021 and/or 2022.

In order to avoid sensitive fish spawning and whale migration periods, acquisition of the survey will only be undertaken between 1 February to 31 July in any given year.

The survey will take at least 132 days to complete, with operations occurring on a 24-hour basis. An additional 30 days of contingency time within the operational area has been provided as part of the environmental assessment.

The survey Operational Area defines the area within which the seismic survey and support vessels will operate and is approximately 20,160 km2. Water depths across the Operational Area range from ~40 m to 250 m.

The Survey Area is comprised of the Ramp-up Zone and Full Power Zone. The Full Power Zone is the area within which the seismic source will be operated in full acquisition mode to achieve the geophysical objectives of the survey. This zone is approximately 8,620 km2, with water depths ranging from 40 m to 168 m. The Ramp-up Zone is a zone that surrounds the full power zone. Typically, this zone will be used to incrementally build the power of the seismic source from non-operation to full capacity, for the purpose of soft starts. This zone is approximately 2,610 km2, with water depths ranging from ~40 m to 185 m.
Location map (click to enlarge)
Location map - Activity: Keraudren Extension 3D Marine Seismic Survey (refer to description)

Accepted EP Documents

EP Document A723648 (69.2 MB)
OPEP Document A723642 (5.15 MB)
NOPSEMA Report A725504 (238 KB)

Related EP assessments

5092 (Click to view)