Calgary-based Petrobank Energy has announced it will merge its Canadian business unit with TriStar Oil & Gas to form a new company focused on light oil buried in southeast Saskatchewan. With expected production of 37,000 barrels per day in 2009, the new company, Petrobakken Energy, will become the provinceÔÇÖs second-largest Bakken oil producer when the merger is completed in October. The deal is said to be worth around $2.24 billion. The tie-up will also make PetroBakken the single largest landholder in the region, with over 800,000 net acres in southeast Saskatchew