US shale surge overwhelms oil market as Opec splits deepen (米シェール急増で石油市場圧倒。OPEC分裂、悪化) Ambrose Evans-Pritchard, houston Telegraph: 9 MARCH 2017 • 6:44PMOil prices have plunged to the lowest level this year as US shale producers boost output at an astonishing pace and crude inventories keep rising, triggering a wave of selling by hedge funds with record speculative positions. 石油価格は今年、米シェール業者が驚くべきスピー