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Otway Basin Regional Geology

The Otway Basin is a northwest-trending passive margin rift basin that extends from southeast of South Australia to a boundary with the contiguous Sorell Basin to the west of King Island. The Basin contains an Upper Jurassic to Holocene succession and covers an area of 150 000 km2, 80% of which lies offshore. The Otway Basin is an established gas producing region; however most discoveries are confined to the onshore and shallow water inboard parts of the basin. Discoveries have not yet been made in either the relatively underexplored, deep water outboard part of the Basin or the Torquay Sub-basin; hence the Discovery Bay High, Morum, Nelson, Hunter and Torquay sub-basins are classified as lightly explored provinces.