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In a statement, Karoon said the appraisal had reached a depth of 1,760m at the Paleocene reservoir.
"Drilling will continue before wireline logging to confirm the presence and extent of the hydrocarbon column," Karoon said.
The Kangaroo-2 appraisal well is located in the Santos basin's block S-M-1165, off Brazil's southeast coast. Karoon holds a 65% operating stake in the block.