A new discovery off the coast of Bahrain is estimated to contain at least 80 billion barrels of tight oil, the kingdom's biggest ever find, its oil minister said on Wednesday. Independent appraisals by U.S.-based oil consultants DeGolyer and MacNaughton and oilfield services company Halliburton had confirmed Bahrain's find of "highly significant quantities of oil in place ... with tight oil amounting to at least 80 billion barrels, and deep gas reserves in the region of 10-20 trillion cubic feet," Oil Minister Sheikh Mohammed bin Khalifa al-Khalifa said. Russia's entire oil reserve is 80 billion barrels. Tight oil is a...