LONDON—Oil prices rose and were heading for their biggest weekly gains since mid-December on Friday as unrest in Kazakhstan and outages in Libya fuelled concerns over supply. Brent crude climbed 76 cents, or 0.9 percent, to $82.75 a barrel at 0939 GMT. U.S. West Texas Intermediate (WTI) crude rose 77 cents, or 1 percent, to $80.23 a barrel. Brent and WTI were on track for gains of almost 6.5 percent in the first week of the year, with prices at their highest since late November, as supply concerns overtook worries that the rapid spread of the Omicron coronavirus variant might hurt demand. “The upward jump in oil prices mostly reflects the market jitters as unrest escalates in Kazakhstan and the political situation in Libya continues to deteriorate and sideline oil output,” Rystad Energy analyst Louise Dickson said. Security forces appeared to be in control of the streets of Kazakhstan’s main …