0722 GMT - BP stock could become 30% more valuable relative to its performance if its current oil and gas exploration efforts are successful, Citi analysts write. The giant Brazilian offshore discovery Bumerangue is its hottest prospect, and combined with efforts in the U.S., Venezuela and Iraq, the British energy company's oil supply lifespan could grow to 14 years from the seven years reported at the end of 2025, they write. BP's reserve life outside its U.S. BPX business has fallen behind peers after it invested heavily in a pivot toward renewable forms of energy that dented its valuation, they say. BP's shares rise 0.8% to 550 pence.