A third of America’s domestic crude oil – and most of the Gulf’s oil-comes from wells that are “deep water,” using the administration’s definition. The moratorium does not affect existing wells, but by freezing out virtually all new offshore wells, it will prevent some 200,000 barrels per day of output next year, and perhaps 340,000 barrels per day-20 percent of total U.S. production-by 2015, with the amount increasing every year after that.