Calgary, Alberta – An energy company with a major natural gas operation in Wyoming is purchasing another company that does work in the state. Canadian energy giant EnCana is buying Tom Brown Incorporated. The $2.2 billion cash deal will boost EnCana's assets in Wyoming, Colorado, and Texas. Tom Brown is a natural gas producer in the Green River and Wind River Basins. EnCana also works in the Green River Basin, with its Jonah Field operation.