The Honor Rancho Oil Field (also Honor Rancho Natural Gas Storage Field, Honor Rancho Underground Storage Facility) is an approximately 600-acre oil field and natural gas storage facility in Los Angeles County, California, in the foothills north of Valencia, near the junction of Interstate 5 and westbound California State Route 126.
 Discovered in 1950 and quickly developed, the field's oil production peaked in the 1950s, but remains productive in 2016.
 In 1975 Southern California Gas Company (SoCalGas), the gas utility serving Southern California, began using one of its depleted oil producing zones, the Wayside 13 zone, as a gas storage reservoir, and it became the second-largest in their inventory after the Aliso Canyon gas storage facility.
 The field shares part of its extent with the Peter J. Pitchess Detention Center, which includes a maximum-security prison.
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.
The Round Mountain Oil Field is a large oil and gas field in the foothills of the Sierra Nevada, about 10 mi northeast of Bakersfield, California, United States.
 It is east of the giant Kern River Oil Field, one of the largest in the United States, and also close to the Mount Poso Oil Field and Kern Front Oil Field.
 With a cumulative total recovery of more than 110 Moilbbl of oil, it is the 48th largest oil field in California, but remains relatively productive with still about ten percent of its reserves remaining in the ground, according to the California Department of Oil, Gas, and Geothermal Resources (DOGGR).
The Aliso Canyon Oil Field (also Aliso Canyon Natural Gas Storage Field, Aliso Canyon Underground Storage Facility) is an oil field and natural gas storage facility in the Santa Susana Mountains in Los Angeles County, California, north of the Porter Ranch neighborhood of the City of Los Angeles.
 Discovered in 1938 and quickly developed afterward, the field peaked as an oil producer in the 1950s, but has remained active since its discovery.
 One of its depleted oil and gas producing formations, the Sesnon-Frew zone, was converted into a gas storage reservoir in 1973 by the Southern California Gas Company, the gas utility servicing the southern half of California.
 This reservoir is the second-largest natural gas storage site in the western United States, with a capacity of over 86 billion cubic feet of natural gas.
 Currently it is one of four gas storage facilities owned by Southern California Gas, the others being the La Goleta Gas Field west of Santa Barbara, Honor Rancho near Newhall, and Playa del Rey.
The South Belridge Oil Field is a large oil field in northwestern Kern County, San Joaquin Valley, California, about forty miles west of Bakersfield.
 Discovered in 1911, and having a cumulative production of over 1500 Moilbbl of oil at the end of 2008, it is the fourth-largest oil field in California, after the Midway-Sunset Oil Field, Kern River Oil Field, and Wilmington Oil Field, and is the sixth-most productive field in the United States.
 Its estimated remaining reserves, as of the end of 2008, were around 494 Moilbbl , the second-largest in the state, and it had 6,253 active wells.
 The principal operator on the field was Aera Energy LLC, a joint venture between Royal Dutch Shell and ExxonMobil.
 Additionally, the field included the only onshore wells in California owned and operated by ExxonMobil.
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 .
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.
The Summerland Oil Field (and Summerland Offshore Oil Field) is an inactive oil field in Santa Barbara County, California, about four miles (6 km) east of the city of Santa Barbara, within and next to the unincorporated community of Summerland.
 First developed in the 1890s, and richly productive in the early 20th century, the Summerland Oil Field was the location of the world's first offshore oil wells, drilled from piers in 1896.
 This field, which was the first significant field to be developed in Santa Barbara County, produced 3.18 million of barrels of oil during its 50-year lifespan, finally being abandoned in 1939-40.
 Another nearby oil field entirely offshore, discovered in 1957 and named the Summerland Offshore Oil Field, produced from two drilling platforms in the Santa Barbara Channel before being abandoned in 1996.
Venoco, Inc., Venoco Corporation, or Venoco, is a private American oil and gas exploration and production corporation.
 It maintains an office in Carpinteria, California, and its corporate headquarters are in Denver.
 Predominantly active in California, it is a large natural gas producer in the Sacramento Valley and produces oil and gas both onshore and offshore of southern and central California.
 The company has fields and prospects in Santa Barbara County, Monterey County, Kern County, San Luis Obispo County, and Ventura County.
 Venoco owns and operates the Santa Clara Avenue Oil Field in Ventura County as well as the South Ellwood Oil Field offshore of Santa Barbara, the Santa Clara Offshore Oil Field and the Sockeye Oil Field in the Santa Barbara Channel, west of Ventura.
The Elk Hills Oil Field (formerly the Naval Petroleum Reserve No. 1) is a large oil field in northwestern Kern County, in the Elk Hills of the San Joaquin Valley, California in the United States, about 20 mile west of Bakersfield.
 Discovered in 1911, and having a cumulative production of close to 1.3 Goilbbl of oil at the end of 2006, it is the fifth-largest oil field in California, and the seventh-most productive field in the United States.
 Its estimated remaining reserves, as of the end of 2006, were around 107 Moilbbl , and it had 2,387 active oil-producing wells.
 It is by an order of magnitude the largest natural gas-producing oil field in California, having produced over 2 Tcuft of gas since its discovery, and retaining over 700 Gcuft in reserve, making it even larger than the Rio Vista Gas Field, the largest non-associated natural gas field in the state.

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