Qatar Petroleum (QP) is the National Oil Company of the State of Qatar. The principal activities of QP and its subsidiaries and joint ventures cover exploration, drilling and production operations, transport, storage, marketing and sale of crude oil, natural gas liquids, liquefied natural gas, refined products, petrochemicals and fertilizers, and providing helicopter services. QP's Chairman, Sheikh Abdullah Bin Hamad Al-Attiyah, is also the head of the Ministry of Energy and Industry and, as of April 2007, the Deputy Prime Minister of Qatar. QP’s operations are therefore directly linked with state planning agencies, regulatory authorities, and policymaking bodies. Currently it is the third largest oil company in the world by oil and gas reserves. QP’s strategy of conducting hydrocarbon exploration and new projects is through Exploration and Production Sharing Agreements (EPSA) and Development and Production Sharing Agreements (DPSA) concluded with major international oil and gas companies. The operations and activities of QP are conducted on various onshore locations, which include Doha, Dukhan, Mesaieed and Ras Laffan Industrial Cities, as well as offshore areas including Halul Island, Offshore Production Stations, Drilling Platforms and the North Gas Field.