SINGAPORE: Oil prices stabilized on Friday, heading for their first weekly rise since the end of November, as additional sanctions on Iran and Russia ratcheted up supply worries, while a surplus outlook weighed on markets. Brent crude futures edged up 7 cents to $73.48 a barrel by 7:34 a.m. Saudi time, while US West Texas Intermediate crude was at $70.11 a barrel, up 9 cents.