Idemitsu Kosan Co.,Ltd. (Head Office: Chiyoda-ku, Tokyo; Representative Director and CEO: Shunichi Kito) is pleased to announce that its subsidiary, Idemitsu Snorre Oil Development Co., Ltd. (Head Office: Chiyoda-ku, Tokyo; President: Jun Miki)*1 has discovered, through Idemitsu Petroleum Norge AS*2 (Managing Director: Hiroshi Arikawa), an accumulation of oil by the exploration well 34/4-15S and 34/4-15A in the “Dugong” structure in PL882, in which the company owns a 20% interest.