Dorsey & Whitney advised Kodiak Oil & Gas in its recent acquisition by Whiting Petroleum Corp. (WLL.N). Whiting Petroleum Corp. will acquire Kodiak Oil & Gas Corp (KOG.N) for $3.8 billion in stock, to become the largest producer in North Dakota's Bakken shale oil formations. The deal will unite two big exploration and production companies, both of which have a strong presence in the Bakken and Three Forks formations, some of the most oil and gas rich areas of the Dakotas and Montana.