Saudi Arabia’s potential sale of shares in its state-owned oil giant could include listing at least part of its exploration and production assets, the company’s chairman said in an interview Monday , countering speculation that any IPO would focus solely on its refining and petrochemical arms. “We are considering a listing at the top. So a listing of the main company, and obviously the main company will include upstream,” said Khalid al-Falih, chairman of the Saudi Arabian Oil Co., better known as Saudi Aramco, referring to the company’s exploration and production units. A potential listing of Saudi Aramco’s reserves presents a dizzying challenge for the kingdom, investors and bankers. The company says it has more than 260 billion barrels of proved reserves and the equivalent of 50 billion barrels of natural-gas reserves—more than 12 times the largest nonstate-controlled oil company, Exxon Mobil Corp. XOM -1.34 % Even a listing […]