 New gas reserves in the WCSB will likely come from unconventional sources such as coalbed methane (CBM).The number of coalbed methane wells in Alberta more than doubled in 2005, to 7764 by the end of that year, producing nearly of gas per day.More than 95 percent of the CBM wells were completed in the Upper Cretaceous Horseshoe Canyon and Belly River formations, at typical depths of to .