The OPEC Reference Basket of Crudes is made up of Murban (UAE), 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) and Merey (Venezuela). A barrel equals 159 litres.