Apache Corporation CEO Steve Farris smiles during an interview session while attending the annual CERAWeek energy conference in Houston March 6, 2012. Depressed U.S. prices for natural gas will keep forcing dry gas producers to migrate to more-lucrative liquid-rich plays or curb drilling until the market rebounds, Farris said during an interview with Reuters at the conference. REUTERS/Richard Carson (UNITED STATES - Tags: BUSINESS ENERGY)