Aug 15 (Reuters) - Australian oil and gas producer Santos Ltd (STO) said it expects to book a net impairment charge of about $690 million after tax in its half-year results, mostly on its Gladstone LNG project after slashing its oil price outlook.
Santos said it would write down the value of the GLNG project by about $870 million after tax, adding to a $1.1 billion writedown a year ago on the $18.5 billion project.
That would be partly offset by gains in the value of its Cooper Basin gas assets.
