Israel's offshore oil and gas fields could mean decades of self-sufficiency, and big profits for Noble Energy and its billionaire partner. All big oil and gas fields have geopolitical significance, but in recent years we haven't seen one with the potential to matter more than Leviathan--a prospect off the coast of northern Israel. Noble Energy in Houston will begin drilling a $150 million well into Leviathan in October. Noble's partners on the well, subsidiaries of billionaire Yitzhak Tshuva's Delek Group, announced in late August that Leviathan is estimated to contain 16 trillion cubic feet of easily recoverable gas, while its...