Exxon Mobil Corp ( XOM.N ) is exploring the sale of many of its U.S. Gulf of Mexico assets, as higher prices prompt the world’s largest publicly traded oil company to review its portfolio, people familiar with the matter said on Tuesday. Major oil companies have been looking to concentrate development operations in a few key areas. Irving, Texas-based Exxon is focusing on promising acreage in offshore areas such as Guyana and Brazil and onshore in the Permian basin of Texas. Exxon has asked a small number of parties to gauge their potential interest in the company’s Gulf assets, ahead of making a decision on how to proceed, according to two of the sources, adding that […]