Woodside Petroleum has upgraded the proven reserves by 10% at the fields that provide feedstock gas supplies into its Pluto LNG facility in Western Australia.

The company said proven reserves at the Greater Pluto fields were up to 317.1 million barrels of oil equivalent net to Woodside's 90% share.

Of that tally, 113.6 million boe net to Woodside are undeveloped.

However the company downgraded its proven plus probable reserves at the same fields by 10% to 394.9 million boe of which 133.4