The basket of 12 crude oils of the Organisation of Petroleum Exporting Countries (OPEC) closed at $57.92 a barrel Monday, compared to $58.65 last Friday, the OPEC Secretariat said.

 

  

 The new OPEC reference basket comprises Saharan Blend (Algeria), Girassol (Angola), Oriente (Ecuador), Iran Heavy (Iran), Basra Light (Iraq), Kuwait Export (Kuwait), Es Sider (Libya), Bonny Light (Nigeria), Qatar Marine (Qatar), Arab Light (Saudi Arabia), Murban (United Arab Emirates) and Merey (Venezuela). A barrel equals 159 litres.