The role and future of oilfields off Scotland and their revenue streams have been a source of debate in the run-up to the Scottish independence referendum. BP ETAP (Eastern Trough Area Project) oil platform in the North Sea, pictured here in February, is around 100 miles east of Aberdeen, Scotland. Agence France-Presse/Getty Images ABERDEEN, Scotland—Scotland votes next month on whether to split from the U.K., and Scottish Energy Minister Fergus Ewing is trying to reassure oil companies that the country’s large energy industry will flourish after independence. “Our (energy) policy has been primarily designed by industry,” Mr. Ewing said in a recent interview, promising that won’t change in an independent Scotland. Britain’s oil and natural-gas reserves, much of them off Scottish shores in the North Sea, have become a particularly fraught flash point in the debate over independence, which culminates in a Sept. 18 referendum. Recent polling suggests Scots […]