Question: The Girassol oil field was first discovered by which multinational oil and gas company?

full_context: Document 1: BP: BP P.L.C., formerly British Petroleum, is a British multinational oil and gas company headquartered in London. It is one of the world's seven oil and gas "supermajors", whose performance in 2012 made it the world's sixth-largest oil and gas company, the sixth-largest energy company by market capitalization and the company with the world's twelfth-largest revenue (turnover). It is a vertically integrated company operating in all areas of the oil and gas industry, including exploration and production, refining, distribution and marketing, petrochemicals, power generation and trading. It also has renewable energy interests in biofuels and wind power.
Document 2: Total S.A.: Total S.A. (] ; or ) is a French multinational integrated oil and gas company and one of the seven "Supermajor" oil companies in the world. Its businesses cover the entire oil and gas chain, from crude oil and natural gas exploration and production to power generation, transportation, refining, petroleum product marketing, and international crude oil and product trading.
Document 3: Oil reserves in Libya: Oil reserves in Libya are the largest in Africa and among the ten largest globally with 46.4 Goilbbl as of 2010. Oil production was 1.65 Moilbbl/d as of 2010, giving Libya 77 years of reserves at current production rates if no new reserves were to be found. Libya is considered a highly attractive oil area due to its low cost of oil production (as low as $1 per barrel at some fields in 2002), low sulfur content, being classified as "sweet crude" and in its proximity to European markets. Libya's challenge is maintaining production at mature fields, while finding and developing new oil fields. Most of Libya remains under-explored as a result of past sanctions and disagreements with foreign oil companies.
Document 4: Girassol oil field: The Girassol Oil Field is an oil field located in the Atlantic Ocean. It was discovered in 1996 and developed by BP. The oil field is operated and owned by Total S.A.. The total proven reserves of the Girassol oil field are around 700 million barrels (94×10tonnes), and production is centered on 200000 oilbbl/d .
Document 5: Oil and Natural Gas Corporation: Oil and Natural Gas Corporation Limited (ONGC) is an Indian multinational oil and gas company headquartered in Dehradun, Uttarakhand, India. It is a Public Sector Undertaking (PSU) of the Government of India, under the administrative control of the Ministry of Petroleum and Natural Gas. It is India's largest oil and gas exploration and production company. It produces around 77% of India's crude oil (equivalent to around 30% of the country's total demand) and around 62% of its natural gas.
Document 6: Oil and Gas Development Company: Oil and Gas Development Company Limited commonly known as OGDCL is a Pakistani multinational oil and gas company. It has a primary listing on the Pakistan Stock Exchange, and secondary listing on the London Stock Exchange. Established in 1961 by the Government of Pakistan, it was turned into a public listed company on 23 October 1997. Today it is involved in exploring, drilling, refining and selling oil and gas in Pakistan. It is the market leader in terms of reserves, production and acreage. It is based on Jinnah Avenue, Blue Area in Islamabad, with the Government of Pakistan holding 74% stake in the company. Rest are held by private investors. In 2013, it has revenue of Rs. 223.365 billion and profit before tax soaring at Rs. 90.777 billion.
Document 7: Royal Dutch Shell: Royal Dutch Shell plc (, ), commonly known as Shell, is a British–Dutch multinational oil and gas company headquartered in the Netherlands and incorporated in the United Kingdom. It is one of the six oil and gas "supermajors" and the sixth-largest company in the world measured by 2016 revenues (and the largest based in Europe). Shell was first in the 2013 Fortune Global 500 list of the world's largest companies; in that year its revenues were equivalent to 84% of the Netherlands' $556 billion GDP.
Document 8: Bu Hasa oil field: The Bu Hasa Oil Field is an oil field 84 km north west of Abu Dhabi Islands. It was discovered in 1962 and developed by Abu Dhabi Petroleum Company. The oil field is owned by Abu Dhabi National Oil Company and operated by Abu Dhabi Company for Onshore Oil Operations. The total proven reserves of the Bu Hasa oil field are around 6.52 billion barrels (1450×10tonnes), and production is centered on 600000 oilbbl/d .
Document 9: BT Group: BT Group plc (trading as BT) is a holding company which owns British Telecommunications plc, a British multinational telecommunications company with head offices in London, United Kingdom. It has operations in around 180 countries and is the largest provider of fixed-line, mobile and broadband services in the UK, and also provides subscription television and IT services.
Document 10: Tweneboa Enyenra Ntomme Oil Field: The Tweneboa Enyenra Ntomme Oil Field is an oil field within Ghana's territorial waters and the country's second major oil field after the Jubilee Oil Field. It is popularly known as the TEN oil field, an acronym formed from the three drilling fields that it comprises. Coincidentally, the exploration for oil in the basin also started with ten pre-first oil wells.
Document 11: Intercampo oil field: The Intercampo Oil Field is an oil field located in Lake Maracaibo. It was discovered in 1960 and developed by China National Petroleum Corporation. The oil field is operated and owned by China National Petroleum Corporation. The total proven reserves of the Intercampo oil field are around 1.26 billion barrels (170×10tonnes), and production is centered on 10000 oilbbl/d .
Document 12: Cairn Energy: Cairn Energy PLC is one of Europe's leading independent oil and gas exploration and development companies and is listed on the London Stock Exchange. Cairn has discovered and developed oil and gas reserves in a variety of locations around the world. Cairn Energy has a primary listing on the London Stock Exchange and is a constituent of the FTSE 250 Index.
Document 13: Chevron Corporation: Chevron Corporation () is an American multinational energy corporation. One of the successor companies of Standard Oil, it is headquartered in San Ramon, California, and active in more than 180 countries. Chevron is engaged in every aspect of the oil, natural gas, and geothermal energy industries, including hydrocarbon exploration and production; refining, marketing and transport; chemicals manufacturing and sales; and power generation. Chevron is one of the world's largest oil companies; as of 2014 , it ranked third in the Fortune 500 list of the top US closely held and public corporations and sixteenth on the Fortune Global 500 list of the top 500 corporations worldwide. It was also one of the Seven Sisters that dominated the global petroleum industry from the mid-1940s to the 1970s.
Document 14: Šamac oil field: The Šamac oil field is an oil field located in Šamac. It was discovered in 2004 and developed by Energopetrol. The total proven reserves of the Šamac oil field are around 3.6 billion barrels (500×10tonnes), and production is supposed to be centered on 200000 oilbbl/d . If the information regarding this oil field is correct than it is the largest onshore oil field in Europe.
Document 15: Thistle oil field: The Thistle oil field is a large oil field in the Northern sector of the North Sea. The oil field, discovered in September 1972 by Signal Oil and Gas Company, is produced over the Thistle Alpha platform, located 125 nautical miles Northeast of Sumburgh, Shetland Islands and 275 nautical miles Northeast of Aberdeen, Scotland.
ground_truth: BP