Oil prices edged up on Monday as investors bet supply will remain tight amid restrained output by major producers with global demand unperturbed by the Omicron coronavirus variant. Brent crude futures gained 9 cents, or 0.1 percent, to $86.15 a barrel by 0539 GMT. Earlier in the session, the contract touched its highest since Oct. 3, 2018, at $86.71. U.S. West Texas Intermediate crude was up 29 cents, or 0.4 percent, at $84.11 a barrel, after hitting $84.78, the highest since Nov. 10, 2021, earlier in the session. The gains followed a rally last week when Brent rose more than 5 percent and WTI climbed over 6 percent. Frantic oil buying, driven by supply outages and signs the Omicron variant will not be as disruptive as feared for fuel demand, has pushed some crude grades to multi-year highs, suggesting the rally in Brent futures could be sustained a while longer, …