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In mid-1979, a stratigraphic well drilled by the South Australian Department of Mines and Energy (SADME), Byilkaoora-1, encountered shows of aromatic-naphthenic and naphthenic oils while coring Cambrian carbonates in the northeastern Officer basin, South Australia. The oils occupy vugs and partly healed fractures in an alkaline playa-lake sequence of algal-plate dolomite mudstone, dolomite mudstone with Magadi-type chert, and organic-rich dolomitic argillaceous mudstone containing calcite pseudomorphs of sodium carbonate-bicarbonate minerals, notably trona and shortite. Oil-source-rock correlations confirm that the oils originated within those facies drilled. The Byilkaoora oils are thus the first reported examples of nonmarine Cambrian petroleum. They are...

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