A bloodbath in energy stocks is creating a rich opportunity for Big Oil to dominate America’s hottest shale play. Independent producers in the Permian Basin of Texas and New Mexico are trading much lower than when Chevron Corp. bid for Anadarko Petroleum Corp. in April. Royal Dutch Shell Plc and ConocoPhillips have expressed interest in bulking up in shale at the right price. Exxon Mobil Corp.’s chief said Wednesday his company is keeping a “watchful eye” on the Permian for potential deals.