Chevron Corp is cutting staff on its global energy trading desks this week, sources said on Thursday, making it the latest division to face reductions as part of a $3 billion cost-saving plan brought on by low crude oil prices. The Supply and Trading group, based in Houston, but with offices in Singapore, London and San Ramon, California, may be reduced by as much as 10 percent as part of a company-wide job reduction plan, according to two people familiar with the measures. Six other sources said they were aware of the cuts but could not say how deep they might be. While staff cutbacks are now commonplace across the energy industry as companies adjust to oil prices of $50 a barrel, half what they were a year ago, Chevron's moves this week appeared to be some of the largest to affect trading operations. Some companies have sought to protect the trading desks to help navigate choppy markets.