Some are not convinced that the sell-off in oil is over. The rout began in June when Brent peaked at over $115 a barrel and accelerated in November after OPEC refused to cut its production. "There was a lot of short-covering before the month end from people wanting to take profit from the $40-odd lows, so it's not surprising that we rallied," said Tariq Zahir, managing member at Tyche Capital Advisors in Laurel Hollow in New York. But it will take a while for production to respond to lower drilling. "This doesn't change the fundamental outlook in oil. We are still about 2 million barrels oversupplied." Production from OPEC, or the Organization of the Petroleum Exporting Countries, rose in January to 30.37 million barrels per day (bpd), a Reuters poll showed, a sign that key members of the group were resolute about defending their market share. A Reuters poll shows oil prices may post only a mild recovery in the second half of the year, with prices still averaging less in 2015 than during the global financial crisis. (OILPOLL) Joseph Posillico, senior vice president of energy futures at Jefferies in New York, also warned of a short-term, short-covering rally that could be quickly reversed. "This is just the market being the market and we could give these all back in the next few sessions."