Miri mainly relies on its oil and gas industry, which contributes significantly to the Gross Domestic Product (GDP) of Sarawak. Sarawak Shell Berhad (upstream business) and Petronas Carigali Sdn Bhd have their offices based in Miri. Other multinational oil and gas companies also set up their offices here, including Nippon Oil, Schlumberger, Baker Hughes, Halliburton, Technip, Ranhill WorleyParsons, and Petra Resources Sdn Bhd. In 1989, Asam Paya Oilfield was discovered in Sarawak inland areas. In 2010, Petronas discovered two oil fields offshore between Bintulu and Miri. In 2011, new underground reserves of oil and gas deposits were discovered by Nippon Oil in an inland region near Miri, Sarawak.