Energy explorers reeling from the rout in oil prices are looking for liquidity in an obvious place: their rocks. Having exhausted other ways to raise cash as a glut of global supply depresses prices, a slew of producers from Anadarko Petroleum Corp. to Comstock Resources Inc. announced more than $2.4 billion in asset sales last month, according to data compiled by Bloomberg. Selling oil and gas fields to pay off lenders and fund new drilling — often a wildcatter’s option of last resort — is surging after a six-month lull. There’s more to come — by one estimate, another $20 billion this year — as executives at Occidental Petroleum Corp., Whiting Petroleum Corp., Penn Virginia Corp., Exco Resources Inc., Chesapeake Energy Corp . and Ultra Petroleum Corp. have all said in recent weeks that they are selling assets or exploring sales. The surge shows how the industry’s two-pronged strategy […]