Chevron and Hess Corp. have announced a $60 billion merger, the second major oil deal this month as energy prices surge. The acquisition will add a major oil field in Guyana and shale properties in the Bakken Formation in North Dakota to Chevron's portfolio. This follows Exxon Mobil's announcement two weeks ago to acquire Pioneer Natural Resources for $60 billion, and analysts expect more deals to follow as oil prices remain high.