Saudi Aramco is the state-owned national oil company of Saudi Arabia. It is the largest oil corporation in the world with the largest proven crude oil reserves and production.[2] Headquartered in Dhahran, Saudi Arabia,[3] Saudi Aramco also operates the world's largest single hydrocarbon network, the Master Gas System. Its yearly production of only crude oil neared 3.4 billion barrels (540,000,000 m3) and it managed over 100 oil and gas fields in Saudi Arabia totaling at least 264 billion barrels (4.20×1010 m3) of oil reserves and 253 quadrillion scf of gas reserves.

www.saudiaramco.com

Eni, is an Italian multinational oil and gas company, present in 70 countries, and currently Italy's largest industrial company. Eni, in the role of operator and in partnership with the Spanish company Repsol YPF, signed a contract with Saudi Aramco for exploration, development and production of gas in "Area C" located in the Rub Al Khali basin, in Saudi Arabia.

LUKOIL Saudi Arabia Energy Ltd. (LUKSAR) was established on March 01, 2004 with equity participation of LUKOIL Overseas (80%) and its National partner, Saudi Aramco (20%). The office of LUKSAR is based in Al-Khobar (Eastern Province of Saudi Arabia).

www.lukeoil.com

Repsol is an integrated Spanish oil and gas company with operations in 29 countries. It is now the 15th largest petroleum refining company and employs over 36,000 people worldwide. Repsol processes more then 50 milliones tonnes of crude oil every year and is present in 4 continents It distributes to more then 7,000 service stations and to 10, million customers of brutane and gas.

www.repsol.com

SABIC is the Saudi Basic Industries Corporation and the most profitable non-oil company in the Middle East and one of the world’s five largest petrochemicals manufacturers. It is a public company based in Riyadh: the Saudi Arabian government owns 70% of its shares, and the remaining 30% are held by private investors in Saudi Arabia and other countries of the Gulf Cooperation Council., one of the world’s leading manufacturers of chemicals, fertilizers, plastics and metals. SABIC supplies these materials to other companies, who use them to make the products on which the world has come to depend.

www.sabic.com

China Petroleum & Chemical Corporation (“Sinopec Corp”) is an integrated energy and chemical Company with principal businesses of exploration production and trading of petroleum and natural gas refining and sales of petroleum products and production and exploration, gas, sales of chemical products. Sinopec Corp. is the second largest producer of crude oil and natural gas in China. In 2004, Sinopec Corp agreed to to explore natural gas reserves in the Rub Alkhali Basin, in Saudi Arabia, in partnership with Saudi Aramco.

Sonatrach is the largest Algerian company and the 11th largest oil consortium in the world. State-owned Sonatrach oversees Algeria's oil and gas exploration, production, and marketing activities. In addition to its exploration, refining, and pipeline operations, the company also invests in electrical power and in desalination projects. The company also has exploration and production activities in other countries, including Libya, Mali, Niger, and Peru. Sonatrach has proved reserves globally of 225 million tons of oil equivalent, and operates a gas station network of more than 1,950 outlets.