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Offshore Gippsland Basin, Bass Strait, Australia

 HISTORY
  • In 2H 2008, ROC acquired its interests in the Gippsland Basin via acquisition of Anzon Australia Limited.

  • ROC's assets in the Gippsland Basin comprise an operating interest in three production licences (VIC/L26, VIC/L27 and VIC/L28) which contain the Basker-Manta-Gummy Oil and Gas Fields, and a non-operating interest in one exploration licence, VIC/P49.

  • The assets are located 50-75 kilometres off the Victorian coast of Australia in water depths of approximately 100-200 metres.
REGIONAL ACTIVITY
  • The Gippsland Basin is in a prolific petroleum province, with well established oil and gas production and estimated 2P ultimate recovery volumes of more than five billion barrels of oil and ten trillion cubic feet of sales gas.

  • Hydrocarbons were first discovered in the offshore by Esso in 1964 at Barracouta. Gas production from the field commenced in 1969 from Late Eocene Latrobe Group clastic reservoirs in a faulted anticline.
GEOLOGY
  • The Basin formed as part of a rift complex between the Australian and Antarctic Plates during the Late Jurassic to Early Cretaceous, followed by Late Cretaceous separation and creation of ocean crust in the Tasman Rift.

  • In the Late Cretaceous, sediments of the Golden Beach Group were deposited in a braided stream environment. These sands are generally of modest reservoir quality. These are overlain by Late Cretaceous/Tertiary Latrobe Group, comprising meandering fluvial channel and coastal barrier sands deposited in a coastal plain / marginal marine environment. Hydrocarbons trapped in these sands in combination structural/stratigraphic traps sealed by overlying shales of the Lakes Entrance Formation or intra-formational shales form the main play. The sands are typically good reservoir quality.
PERMIT SIZE
  • 2,553km2 gross (551km2 net).
JV PARTICIPANTS AND INTERESTS

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ACTIVITY STATUS

Exploration and Appraisal

Five exploration wells have been drilled in VIC/L26, the first discovering oil and gas at Basker-1 in 1983, followed by further discoveries at Manta-1 in 1984 and Gummy-1 in 1990. Basker-Manta 3D seismic was acquired in 1996. One appraisal well was drilled, Basker-2, before proceeding to development.

Two exploration wells have been drilled in VIC/P49, Great White-1 and Whaleshark-1, both of which were plugged and abandoned.

Review of prospectivity for a potential exploration drilling programme is in progress.

Development and Production

The Basker, Manta and Gummy Oil and Gas Fields are currently producing