Lattice Energy files plan for Otway Basin survey work (Australia)

Beach Energy subsidiary Lattice Energy is planning to carry out geophysical and geotechnical seabed assessments on its Otway Basin acreage off Australia.

Survey map / Image by NOPSEMA
Survey map / Image by NOPSEMA

Lattice has proposed to carry out the seabed assessments within eight titles in the Otway Basin in Commonwealth waters.

The seabed assessment is needed to inform the future drilling of offshore subsea gas wells and potential tie-ins to connect the new gas development wells to the existing Thylacine platform and associated pipeline.

At its closest point, the seabed assessment area is approximately 25 km from the township of Port Campbell, Victoria.

The proposed seabed assessments will be carried out over two phases, the first starting in September 2019 and the second startin around March 2020. The seabed assessments are estimated to take between five to 12 days for each proposed drilling area and up to seven days for each of the tie-in flowline and umbilical corridors.

Geophysical methods proposed include multibeam echosounder (MBES), Side-scan sonar (SSS), Sub-bottom profiler (SBP), Magnetometer.

Geotechnical sampling includes piston coring or vibracoring, In situ Cone Penetrometer Testing (CPT), Seabed grab sampling.

Seabed imagery at the well locations and along the flowline and umbilical corridors will be undertaken using a camera placed overboard via a tether and/or by a remotely operated underwater vehicle.

The environment plan is now under assessment by the Australian offshore oil and gas safety regulator NOPSEMA.


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