BP's shares rose more than 5 percent Tuesday after reporting better-than-expected first-quarter profits, but whether the company can post another quarter like that is uncertain.
Guy Baber, an analyst at Piper Jaffray, told CNBC that BP's earnings beat stemmed partly from cost controls, as well as outperformance across upstream, downstream and corporate segments.
"The question becomes, can they maintain this performance moving forward," he said. "Hopefully, we're going to see ... the same things we saw in 1Q."
BP posted an 80 percent year-on-year fall in core earnings for the first quarter, when oil prices touched a near 13-year low, but the result was better than analysts had expected.