Calgary-based Tamarack Valley Energy Ltd will acquire Deltastream Energy Corp in a CAD$1.425-billion (nearly US$1.1 billion) deal that renders it the largest producer in the Clearwater unconventional heavy oil play in Canada’s Alberta province. The acquisition will add 23,000 barrels of oil equivalent to Tamarack’s production next year, according to the company. "With this transaction, Tamarack will become the leading public Clearwater business, with an exceptional combined asset base,” Bill Slavin, Managing…