Brent finds itself stuck in a rising channel of sorts with a minor head and shoulder inside it (neckline support at $48.58).
The bearish price-RSI divergence seen on the above 4-hour chart, coupled with repeated failure to hold above $50.00 indicates prices may see a bearish break from rising channel and test $48.58 levels.
On the higher side, a clear break above $50.83 (Mar 11, 2015) is needed to signal continuation on the rally from Fed lows.