Co-venturer Santos said gross average oil production from Chim Sao during the September quarter was 20,245 barrels per day, compared to 25,500 bpd in the second quarter.
Santos said the gas export pipeline was shut down in late August and oil production had been "curtailed to minimise flaring". No explanation for the shutdown was given.
Gas exports are expected to resume in the December quarter, added Santos.
Chim