Whiting Petroleum Corporation ( NYSE: WLL) announced that its Board of Directors declared a dividend of $1.5625 per share on its 6.25% convertible perpetual preferred stock (NYSE: WLL-PrA). The dividend is payable on September 17, 2012 to holders of record on September 1, 2012. About Whiting Petroleum Corporation Whiting Petroleum Corporation, a Delaware corporation, is an independent oil and gas company that explores for, develops, acquires and produces oil, natural gas and natural gas liquids primarily in the Rocky Mountain, Permian Basin, Mid-Continent, Michigan and Gulf Coast regions of the United States. The Company’s largest projects are in the Bakken and Three Forks plays in North Dakota and its Enhanced Oil Recovery fields in Oklahoma and Texas. The Company trades publicly under the symbol WLL on the New York Stock Exchange. For further information, please visit www.whiting.com.