MEXICO CITY, May 14 (Reuters) – Mexico’s oil regulator voted on Thursday to approve permits for a pair of companies to conduct two-dimensional seismic studies of oil and gas resources in the country’s territorial waters in the Gulf of Mexico. The companies, Norway’s MultiClient Geophysical MCG.OL and U.S.-based ION Geophysical Corp IO.N , are tasked with helping identify potential resources in the largely unexplored waters of the Gulf. (Reporting by David Alire Garcia) (([email protected]; +52 55 5282 7151; Reuters Messaging: [email protected]))