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In a statement, project stakeholder Pacific Rubiales said a 12-hour production test had delivered up to 3,700b/d of 33-degree API oil.
A separate test was also conducted at a lower perforated interval, returning 2,500b/d with an API reading of 31 degrees.
"We continue to be very pleased with the results of the Kangaroo-2 appraisal well, which confirms a significant light oil discovery on our blocks in the offshore Santos basin," Pacific Rubiales CEO Ronald Pantin said.
According to Pantin, a vertical well in the area could produce flow rates of up to 8,000b/d with the figure increasing for a horizontal well bore.
Pacific Rubiales said preparations are underway for a side-track drilling program to "better define resource size and recovery factors."
The Kangaroo area is located in the Santos basin's S-M-1165 block, in shallow waters off the coast of São Paulo state. Karoon holds a 65% operating stake in the block with the balance held by Canada's Pacific Rubiales.