After some strong quarters for Big Oil, the first three months of 2019 proved to be a disappointment. Weighed down by lower oil prices, narrower refining margins and weak LNG prices, profits at the largest integrated oil companies shrank in the first quarter. “We’re not looking for a great first quarter for the group,” Blake Fernandez, senior research analyst with Piper Jaffray & Co’s Simmons Energy, told Reuters ahead of the earnings releases. He does not expect the poor performance to drag down the majors in a sustained…