Excluding 2021 production to date, total 1P reserves are up by around 10%, while total 2P reserves are around 10% lower.
The review follows integrated subsurface studies incorporating 4D seismic acquired in 2020 and well performance data.
Woodside employed a probabilistic method for the calculations: previously it had applied a deterministic method for the Pluto-Xena fields reserves/resources.
Woodside CEO Meg O’Neill said: “Having already produced more than 440 MMboe from the Pluto and Xena reserves since start-up in 2012, the Greater Pluto region has 2P total reserves of approximately 360 MMboe for production in the years ahead.
“We are continually reviewing and optimizing the efficient development of this long-life asset based on improved reservoir data.”