Market participants and analysts are all focused on the imminent oil supply gap that is opening with the U.S. sanctions on Iran just five weeks away. But beyond the shortest term, a larger and more alarming gap in global oil supply is looming—experts forecast that unless large oil discoveries are made soon, the world could be short of oil as early as in the mid-2020s. The latest such prediction comes from energy consultancy Wood Mackenzie, which sees a supply gap opening up in the middle of the next decade. At the current level of low oil…