It could be worse.
An expected positive net write-back to the Cooper Basin carrying value of some $330 million after tax means the impairment will not be as bad as it could have been.
SANTOS has lowered its Brent oil price forecasts and will book a US$690 million (A$878.2 million) write-down in its 2017 half-year results relating to Gladstone LNG and a non-core Indonesian oil field.