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West Southland Basins
Key facts
Where
A region on and offshore of the far south of the South Island.
Geology
Up to 9 km of Cretaceous to Quaternary fill in several basins with a total area of about 20,000 sq km. Key stratigraphic units similar to Taranaki Basin.
Wells drilled
Four deep modern wells drilled, two of them offshore.
Industry infrastructure
Nearest city and port at Invercargill.
Prospects
Gas seeps, degraded oil outcrop onshore. Numerous structural and stratigraphic leads.
Potential source rocks
Cretaceous to Eocene coal measures and interbedded oil shales and carbonaceous mudstones. Source rocks more oil prone than Taranaki.
Potential reservoir rocks
Cretaceous to Eocene terrestrial and shallow marine sandstones, Oligocene marginal marine and deep water sandstones and Miocene sandstones.
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