Internal Eastern Australian Basin


INTERNAL EASTERN AUSTRALIAN BASIN (RU: Внутренний Восточно-Австралийский бассейн) with the petroleum and gas reserves is situated within the Australia continent, on the Central Australian plain (see the Map). The area of the basin is 1.1 million square kilometres. The first field has been discovered during the 1963, the extraction of the gas and condensate is performed since the 1970. The basin includes one petroleum field, 24 gas and gas condensate fields, and 3 petroleum-gas fields, with the initial reserves of 30 million tonnes of the petroleum, and 195 billion cubic metres of the gas.

The major fields: of the gas are the Gidgealpa (94 billion cubic metres), Tirrawarra (27 billion cubic metres), Moomba (25 billion cubic metres), and Della (14 billion cubic metres); of the petroleum is the Moorari (26 million tonnes). The basin is confined to the syneclise of the Great Australian Artesian Basin. At the south, the basin is bounded with the Caledonides folded belt, and with the Broken Hill massif, at the south-west and west, the basin is bounded with the Gawler shield, and with the Musgrave and Eranta massifs, at the north, the basin is bounded with the Glenormiston uplift, with the Yuroke embankment, and with the Mount Isa and Etheridge folded belts, and at the east, the basin is bounded with the Nebin uplift. The basement is heterogenous, pre-Cambrian within the western part of the basin, and Caledonian within the eastern part of the basin. The sedimentary cover is formed of the salt-bearing terrigenous-carbonatic "transitional complex" of the Cambrian - Devonian, of the sandy-clayish coal-bearing depositions of the Carboniferous - Permian, of the sandy-clayish formations of the Mesozoic, and of the coarse-clastic terrigenous rocks of the Cenozoic. The maximal thickness is 5 kilometres. There are productive the sandstones of the Permian at the depth of 1800-3800 metres within the anticlinal zones of the southern and south-western parts of the Cooper depression. At the Nemur, and Northern Dallingary fields, there have the gas-bearing property the Jurassic sandstones, while within the Adavale depression, there have the gas-bearing property the Devonian sandstones within the 4000-4200 interval. During the 1980, there have been extracted 4.5 billion cubic metres of the gas. The cumulative extraction of the gas has amounted to 25 billion cubic metres, of the condensate has amounted to 0.4 million tonnes (1981). The gas is distinguished with the high content of the CO2 compound. There work the Moomba - Gidgealpa - Sydney gas pipeline, and also the Moomba - Adelaide gas pipeline and petroleum products pipeline. The centre of the extraction is the Moomba city.