Chesapeake Energy Corp., Oklahoma City, (NYSE: CHK) has acquired or is in the process of acquiring assets in South Texas, the Fort Worth Barnett Shale and Northwest Oklahoma from four private companies for a total of $660 million in cash. The South Texas assets account for 47% of the assets, with 45% in the Fort Worth Barnett Shale and 8% in Northwest Oklahoma. The assets include proved reserves of160 billion cubic feet of gas equivalent and unproved reserves of 330 billion cubic feet equivalent for total proved-plus-unproved reserves of 490 billion cubic feet equivalent.