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New gas discovery in Australia’s Otway Basin



Cooper Energy have announced a new gas discovery from the Annie-1 exploration well in the Otway basin. This represents the first find in the basin for over a decade.

The Ocean Monarch semi-submersible rig was used to drill the Annie-1 well int he Otway basin, and will next be used to drill the Elanora-1 exploration well in the same area
(Image via Diamond Offshore)

Located approximately 9km offshore Victoria, Annie-1 was drilled to a total depth of 2,442m, in a water depth of 58m. It encountered the Waarre C and Waarre A formation sandstone reservoirs.

Waarre C was the primary target, comprising a gross gas column of 70 metres with gas-on-rock at its base, with a net pay thickness of 62 metres.

The deeper Waarre A sandstone was encountered at 2,341 metres MDRT and was water wet. 

“Annie-1 is the first offshore gas exploration well Cooper Energy has drilled in Australia and the first of an $80 million drill campaign by the Joint Venture this year to find new gas supply for south-east Australia,” said Cooper Energy’s Managing Director David Maxwell.

“We are very pleased with the success at Annie. It is very encouraging for future exploration in the offshore Otway basin and for our strategy to build gas production around the hub of the existing Minerva Gas Plant.

“Preliminary analysis of the geological data from Annie-1 is consistent with the mid-range of our pre-drill estimates. In the coming months, we will complete the subsurface assessments and analysis of data to refine our estimates of field size and to inform decisions regarding field development.”

Further assessments will be made to estimate the size of the field, with production expected to begin in the second half of 2021. Production is expected to involve existing subsea infrastructure from the nearby Casino, Henry and Netherby fields - also operated by Cooper Energy and Mitsui E&P Australia - and the Minerva Gas Plant.

The company are planning another exploration well in the basin later this year, Elanora-1, which will use the same semi-submersible rig, Ocean Monarch, operated by Diamond Offshore.

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New gas discovery in Australia’s Otway Basin - Time to read 2 min
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