(WLL)—Shale is on sale: http://www.bloomberg.com/news/articles/2015-03-11/get-ready-for-oil-deals-shale-is-going-on-sale A decision by Whiting Petroleum Corp., the largest producer in North Dakota’s Bakken shale basin, to put itself up for sale looks to be the first tremor in a potential wave of consolidation as $50-a-barrel prices undercut companies with heavy debt and high costs. …Buyers are ultimately after reserves, the amount of oil a company has in the ground based on its drilling acreage. The value of about 75 shale-focused U.S. producers based on their reserves fell by a median of 25 percent by the end of 2014 compared to 2013, according to data compiled by Bloomberg. That’s opening up new opportunities for bigger companies with a better handle on their debt, said William Arnold, a former executive at Royal Dutch Shell Plc.