Venezuela just went from a forgotten oil pariah to a live market variable — and Big Oil investors are suddenly doing the math. A regime reset in one of the world's most resource-rich countries doesn't lift all majors equally, and for Chevron Corp (NYSE:CVX) and Exxon Mobil Corp (NYSE:XOM) , the divergence could be material.Track CVX stock here.The Donald Trump administration's sudden ouster of Venezuelan President Nicolás Maduro has reopened a door the oil market assumed was welded shut. But while headlines ...