Gas in Victoria

In Victoria, gas may be found in three broad areas. These are known as sedimentary basins and are named after the areas they cover: the Gippsland Basin, the Otway Basin and the Murray Basin. The basin boundaries are defined on the basis of their geology – they contain layers of sedimentary rocks (e.g. sandstones and shales) that have been deposited, buried, compacted; and in most cases folded and faulted by movement within the Earth’s crust over many millions of years.

Offshore and onshore conventional gas

Victoria’s Gippsland and Otway sedimentary basins have an onshore and an offshore component. Exploration for oil and gas has happened for around 100 years in the onshore Gippsland and Otway basins. However, the majority of oil and gas discoveries and production to date have been from the offshore Gippsland and Otway basins. Relatively small amounts of gas have been produced from conventional traps in the onshore Otway Basin. One of these traps is now used to store gas at Port Campbell; the Iona Gas Plant.

There has been some exploration for coal seam and tight gas in the onshore Gippsland and Otway basins. A retention lease for onshore gas is currently in place over the Seaspray area. No commercial discoveries of shale or coal seam gas have been made in Victoria to date.

Gas use by sector

The consumption of natural gas by sector in Victoria as at 2012-13 is:

Sector Petajoules (PJ) Percentage of total
Residential 103.8 36.1%
Commercial 31.9 11.1%
Manufacturing 88.5 30.8%
Mining 23.0 8.0%
Utility Services 35.7 12.4%
Construction, Transport and Agriculture 4.2 1.5%
Total 287.2 99.9%
GAS CONSUMPTION
fire Victoria consumed 287.2 petajoules of gas
house 1.82 million residential customers
building 56,000 business customers

Source: Essential Services Commission, 2014, Energy Retailers Comparative Performance Report – Customer Service 2013-14, p.8