Qatar's Deputy Premier and Minister of Energy and Industry Abdullah bin Hamad Al-Atiyyah opened here today the 28th conference for GCC oil ministers. Saudi Arabia's delegation to the meeting was headed by Minister of Petroleum and Mineral Resources Ali bin Ibrahim Al-Naimi. In a key address, Qatar's minister of Energy and Industry said that preservation of the oil market equilibrium has become a collective responsibility, drawing the attention that current oil price will push investments in oil production projects in producing countries downward leading to future supply shortages.