Jan 7 - Exxon Mobil ( XOM ) said on Tuesday changes in

oil prices would ease its fourth-quarter upstream earnings by

$500 million to $900 million.

The industry bellwether had posted $6.16 billion in upstream

earnings for the third quarter, and a net profit of $7.63

billion in the year-ago fourth quarter.

(Reporting by Tanay Dhumal and Vallari Srivastava in Bengaluru;

Editing by Devika Syamnath)