ALL of the Organisation of Petroleum Exporting Countries (Opec) memmbers want to extend the cartel’s lower production quotas beyond March 20, the Kuwaiti oil minister, Sheikh Saud Nasser al-Sabah, said on Saturday. Sheikh Saud also told the official KUNA news agency that the Opec summit initially planned for the end of March in Caracas has been postponed until the end of September.