The California oil and gas industry has been a major economic and cultural component of the US state of California for over a century. Oil production was a minor factor in the 19th century, with kerosene replacing whale oil and lubricants becoming essential to the machine age. Oil became a major California industry in the 20th century with the discovery of new fields around Los Angeles and the San Joaquin Valley, and the dramatic increase in demand for gasoline to fuel automobiles and trucks. In 1900 California pumped , nearly 5% of the national supply. Then came a series of major discoveries, and the state pumped in 1914, or 38% of the national supply.Harold F. Williamson et al. The American Petroleum Industry the Age of Energy 1899-1959 (1963) p 17 In 2012 California produced of crude oil, out of the total of oil produced in the US, representing 8.3% of national production.US Energy Information Administration, Crude oil production, accessed 10 Mar 2014 California drilling operations and oil production are concentrated primarily in Kern County, San Joaquin Valley and the Los Angeles Basin.
There is also some offshore oil and gas production in California, but there is now a permanent moratorium on new offshore oil and gas leasing and new oil platforms in both California and federal waters, although new wells can be drilled from existing platforms. These restrictions were imposed after the 1969 Santa Barbara oil spill released oil into the Pacific Ocean.1969 Santa Barbara Oil Spill accessed 12 Jan 2014 As of 2022, California produced less than 25 percent of the crude oil used statewide, and the majority of its crude oil was imported from Ecuador, Saudi Arabia, Iraq, and Colombia.
In September 2024, California passed new laws allowing cities, counties, and local voters to block construction of new oil and gas wells in their communities, increasing requirements to plug and clean up idle oil and gas wells, and prohibiting the operation of oil and gas wells located in an oil field within the Baldwin Hills Conservancy in Inglewood.
Early history
There was plenty of visible oil in California and eastern experts said it would be worth a fortune. The early oil ventures in the 1850s and 1860s were well-funded, but all of them failed. The drillers spent $1 million and their poor quality oil was worth only $10,000.Richard Rice et al. The Elusive Eden: A New History of California (1988) p 317
Prospectors after 1848 discovered an increasing number of oil seeps—oil seeping to the surface. In Northern California, there were oil seeps in Humboldt, Colusa, Santa Clara, and San Mateo Counties, and in the asphaltum seeps and bituminous residues in Mendocino, Marin, Contra Costa, Santa Clara, and Santa Cruz Counties. In Southern California, large seeps were found in Ventura, Santa Barbara, Kern, and Los Angeles Counties.Early California oil discoveries accessed 11 Jan 2014 Interest in oil and gas seeps was stirred in the 1850s and 1860s, Interest became widespread after the 1859 commercial discovery of oil in Pennsylvania.
In 1864, Yale chemistry professor Benjamin Silliman, Jr., a leading expert, examined the oil seepages in Ventura County, and wrote reports that indicated excellent commercial possibilities. This led Leland Stanford and his brother Josiah to dig oil tunnels into the south side of Sulphur Mountain, while Thomas A. Scott and Thomas Bard drilled into the north side. The Philadelphia & California Petroleum Company, drilled wells in the Ojai region between 1865 and 1867; one became California’s first "gusher."
As early as 1856 a company began working the tar pits at La Brea Ranch, near Los Angeles, distilling some oil. Initially these oil discoveries were done by hand digging a well with pick and shovel or even tunneling (by hand) into a mountain that contained oil. By sloping the tunnels downward the oil ran out the mouth to be collected. Some of this oil was so thick that when pipelines were used they had to be heated in winter to get the oil to flow. Transporting the oil to a market or refinery was nearly always a primary concern. In 1866 the first oil refinery in California was built near McKittrick Tar Pits in Kern County to process kerosene and asphalt.
Much of California’s early oil discoveries were in the form of asphalt also known as bitumen a sticky, black and highly viscous liquid or semi-solid form of petroleum. It was found in natural deposits and by processing it became a refined product. Some cities in California started asphalting their streets in the 1870s to keep down dust and mud. In the 20th century the primary use is in road construction, where it is used as the glue or binder mixed with aggregate particles or gravel to create asphalt concrete.
Oil production
The story of oil production in California began in the late 19th century."Oil and Gas Production: History in California." State of California. Web. 18 Mar. 2013. <ftp://ftp.consrv.ca.gov/pub/oil/history/History_of_Calif.pdf >. As of 2012, California was the nation's third most prolific oil-producing state, behind only Texas and North Dakota. In the 20th century, California’s oil industry grew to become the state’s number one GDP export and one of the most profitable industries in the region.E. Hugenin, History of gas conservation in California (1945)
Standard Oil largely controlled the distribution of oil products in the state. After its breakup by the Supreme Court in 1911, its California operations became Standard Oil of California or "California Standard." It is now part of Chevron Corporation.
The Los Angeles City Oil Field was discovered in 1890, and made famous by Edward L. Doheny's successful well in 1892. The field became the top producing oil field in California, accounting for more than half of the state's oil in 1895. Doheny became one of the richest men in California. The peak year was 1901, with 200 separate oil companies active on the field. In 2011 only one small well remained in production.
In 1900, the state produced 4 million barrels. In 1903, California became the leading oil-producing state in the US, and traded the number one position back-and forth with Oklahoma through the year 1930.G. R. Hopkins and A. B. Coons, 1934, "Crude petroleum and petroleum products," in: Statistical Appendix to Minerals Yearbook 1932-33, US Bureau of Mines, p.306-307. Production at the various oil fields increased to about 34 million barrels by 1904. By 1910 production has reached 78 million barrels.
By 1920, oil production in California had expanded to 77 million barrels. Between 1920 and 1930, new oil fields across Southern California were being discovered with regularity including Huntington Beach in 1920, Long Beach and Santa Fe Springs in 1921, and Dominguez in 1923. Southern California had become the hotbed for oil production in the United States. A 1926 Times magazine article stated that the Standard Oil Company of California (now Chevron) was then the largest individual producer of crude oil in the U.S. and dominated the marketing of petroleum products along the west coast of both Americas." . Oil and Gas Production: History in California
In 1929, however, the sense of crisis in the oil market grew as vast amounts of oil supplies were going unused in Southern California and throughout the US. The situation got worse during the Great Depression, with oil selling for 25 cents a barrel. The solution came in the mid-1930s when the Railroad Commission of Texas gained permission of Washington and the major oil companies to set the national price of oil.
San Joaquin Valley Oil
Except for a couple of mediocre wells on the "westside" of the San Joaquin Valley, and a few tar mining operations, farming was the mainstay of the valley in the late 1800s. However, the 1899 discovery of "black gold" in a shallow hand-dug oil well on the west bank of the Kern River changed all that. The Kern River discovery started an oil boom, and a forest of wooden derricks sprang up overnight on the flood plain just north of Bakersfield, a sleepy farm town known to most as "Bakers Swamp". Soon Kern River production accounted for 7 out of every 10 barrels of oil that came from California, and the Kern River field by 1903 had made California the top oil-producing state in the country.
Inspired by the Kern River discovery, oil prospectors fanned out across the San Joaquin Valley, and derricks began to pop up everywhere. Many discoveries followed, and a string of spectacular gushers at Coalinga, McKittrick and Midway-Sunset fields kept the valley in the oil news.
The Valley is also home to 21 giant oil fields which have produced over 100 million barrels of oil each, with four "super giants" that have produced over 1 billion barrels of oil. Among these "super giants" are Midway-Sunset with approximately 3.5 billion barrels of total production since discovery (the largest oil field in the lower 48 United States), Kern River Oil Field with 2.6 billion barrels of total production, South Belridge Oil Field with 2.1 billion barrels of total production, and Elk Hills Oil Field with approximately 2.2 billion barrels of total production over its lifespan (former U.S. Naval Petroleum Reserve).
Refining and distribution
Five companies controlled most of the refining and distribution of oil in California in the early twentieth century. The leader was California Standard (Chevron Corporation), a separate company since the court-ordered breakup of the Standard Oil trust in 1911. Second was the Union Oil Company, formed in 1890, and based in Ventura County. The Shell Company of California was the only affiliate of an outside Corporation. The Associated Oil Company was fourth, and was controlled by the Southern Pacific Railroad Company. The newest company was General Petroleum Company, organized in 1910, which operated in the San Joaquin and southern fields. Union Oil Company of California, ("Unocal") was bought out by Chevron in 2005 after a Chinese attempt to buy the company failed.Arthur M. Johnson, "California and the National Oil Industry," Pacific Historical Review (1970) 39#2 pp. 155-169 at p 159 A declining percentage of the oil supplied to California's refineries is produced in California, down to 23.4% in 2023 from 51.0% in 1993, thirty years earlier. 15.9% of oil supplied to California's refineries came from Alaska in 2023, and 60.7% came from foreign sources.
California shale oil (tight oil) production
Widely distributed in sedimentary basins of southern California is the Monterey shale, thought by some to contain more than 400 billion barrels of oil in place. The formation has for many years yielded oil in areas where it is naturally fractured, and oil companies are investigating ways to make the shale in currently non-productive areas give up the oil through artificial fracturing.California shale oil production accessed 12 Jan 2013 Over some large areas, California's geologic layers are complexly folded, making horizontal drilling difficult. As of 2013, the Monterey shale has resisted attempts to obtain economic production of oil through hydraulic fracturing, fracking, which involves injecting water, sand, and chemicals into the shale under high pressure, to crack the rock and allow the oil and gas to flow. The U.S. Energy Information Administration estimated there were over 15 billion barrels of oil; further study reduced this amount to 21 million barrels of unconventional tight oil, owing to severe fracturing in the shale rock. , USGS, Updated Oct. 6, 2015
Chronology of the California oil industry
1864: Tar mined from open pits at Asphalto (McKittrick) on west side of San Joaquin Valley. 1866: First refinery in Kern County built near McKittrick tar pits to process kerosene and asphalt. 1866: Oil is collected from tunnels dug at Sulphur Mountain in Ventura County by the brothers of railroad baron Leland Stanford