It remained unclear whether a deal to cut production by up to 5 per cent would be struck any time soon.
Benchmark Brent futures jumped as much as 8 per cent to nearly US$36 a barrel before ending up US79c, or 2.39 per cent, at US$33.89 a barrel. US crude rose US92c, or 2.85 per cent, at US$33.22 a barrel.
Tumbling energy prices, stemming from worries about weakening demand from world No2 economy China, have roiled financial markets. This was a concern the Fed cited as a factor for keeping its key policy rate at 0.25-0.50 per cent on Thursday.
The Fed's worry over global and financial developments spurred selling in the US dollar against most major currencies.