Oil prices edged higher on Friday but were on track for a weekly decline amid fears of sharp interest rate hikes that would slam global growth and hit fuel demand.
Brent crude futures were up 56 cents, or 0.6%, to $91.40 a barrel as at 0610 GMT, but were down 1.5% for the week so far.
U.S. West Texas Intermediate (WTI) crude futures gained 42 cents, or 0.5%, to $85.52 a barrel, but were down 1.4% on a weekly basis.
Zephyr Energy plc (LON:ZPHR) is an investment platform formed to aggregate responsibly-developed, economically-attractive oil and gas interests in the Rocky Mountain region of the United States.