Some 800 foreign companies will attend Tehran’s 19th Oil and Gas Show to vie for Iran’s $50-billion investment market. The 19th International Oil, Gas, Refining and Petrochemical Exhibition, scheduled for May 6-9, will be of great importance due to changes in Iran’s political ambiance following the breakthrough Geneva nuclear deal with world powers, Shana reported on Monday. Akbar Nematollahi, director for public relations of Iran’s Oil Ministry and organizer of Tehran’s 19th Oil and Gas Show, said over 2,000 Iranian and foreign companies will attend the show. Nematollahi said the space requested by 800 foreign companies participating in the exhibition is more than the previous year. He said 22 countries owning technology in the energy sector have registered to attend. Nematollahi said Tehran’s oil show is among the top five oil exhibitions held in the world. Iran, which holds 11 percent of the world’s total crude oil and 18 percent of its natural gas reserves, holds the oil and gas show every year. Given the number of participants, this exhibition is among the most important shows in the world. The presence of famous international companies as well as Iranian manufacturers and industrialists provides a good chance for upgrading mutual cooperation, attracting investment and signing contracts.