The price of OPEC reference basket comprising 14 different crudes from member states stood at US$66.13 a barrel, on Thursday closing trading, compared to $65.12 the previous day, according to OPEC Secretariat calculations, Emirates news agency WAM reported. OPEC benchmark basket is made up of the following crudes: Murban (UAE), Saharan Blend (Algeria), Girassol (Angola), Oriente (Ecuador), Zafiro (Equatorial Guinea), Rabi Light (Gabon), Iran Heavy (Iran), Basra Light (Iraq), Kuwait Export (Kuwait), Es Sider (Libya), Bonny Light (Nigeria), Qatar Marine (Qatar), Arab Light (Saudi Arabia), and Merey (Venezuela).