History of The Petroleum Industry in The United States - California

California

Native Americans had known of the tar seeps in southern California for thousands of years, and used the tar to waterproof their canoes. Spanish settlers also knew of the seeps, such as at Rancho La Brea (Spanish for Tar Ranch) in present-day Los Angeles, from which the priests obtained tar to waterproof the roofs of the Los Angeles and San Gabriel missions.

Despite the abundance of well-known seeps in southern California, the first commercial oil well in California was drilled in Humboldt County, northern California in 1865.

Some attempts were made in the 1860s to exploit oil deposits under tar seeps in the Ventura Basin of Ventura County and northeastern Los Angeles county. The early efforts failed because of complex geology, and, more importantly, because the refining techniques then available could not manufacture high-quality kerosene from California crude oil, which differed chemically from Pennsylvania crude oil. Most California crude oil in the early years was turned into the less lucrative products of fuel oil and asphalt.

Oil production in the Los Angeles Basin started with the discovery of the Brea-Olinda Oil Field in 1880, and continued with the development of the Los Angeles City Oil Field in 1893, the Beverly Hills Oil Field in 1900, the Salt Lake Oil Field in 1902, and many others. The discovery of the Long Beach Oil Field in 1921, which proved to be the world's richest in production per-acre of the time, increased the importance of the Los Angeles Basin as a worldwide oil producer. This increased again with the discovery of the Wilmington Oil Field in 1932, and the development of the Port of Los Angeles as a means of shipping crude oil overseas.

Production in Santa Barbara County began in the 1890s with the development of the Summerland Oil Field, which included the world's first offshore oil wells. With the discovery of the Orcutt and Lompoc fields, northern Santa Barbara County became a regional center of production; towns such as Orcutt owe their existence to the quickly growing industry.

Oil in the San Joaquin Basin was first discovered at the Coalinga field in 1890. By 1901, the San Joaquin Basin was the main oil-producing region of California, and it remains so in the 21st century, with huge oil fields including the Midway-Sunset, Kern River, and Belridge fields producing much of California's onshore oil.