WThe Brea-Olinda Oil Field is a large oil field in northern Orange County and Los Angeles County, California, along the southern edge of the Puente Hills, about four miles (6 km) northeast of Fullerton, and adjacent to the city of Brea. Discovered in 1880, the field is the sixteenth largest in California by cumulative production, and was the first of California's largest 50 oil fields to be found. It has produced over 412 million barrels of oil in the 130 years since it was first drilled, and retains approximately 19 million barrels in reserve recoverable with current technology. As of the beginning of 2009, 475 wells remained active on the field, operated by several independent oil companies, including Linn Energy, BreitBurn Energy Partners L.P., Cooper & Brain, and Thompson Energy.
WThe Fruitvale Oil Field is a large oil and gas field in the southern San Joaquin Valley, California, within and just northwest of the city of Bakersfield, along and north of the Kern River. It is one of the few oil fields in the California Central Valley which is mostly surrounded by a heavily populated area. Discovered in 1928, and with a cumulative total recovery of more than 124 million barrels (19,700,000 m3) of oil at the end of 2006, it is 41st in size among California oil fields, and according to the California Department of Oil, Gas, and Geothermal Resources (DOGGR) its total reserve amounts to a little less than ten percent of its original oil.
WThe Inglewood Oil Field in Los Angeles County, California, is the 18th-largest oil field in the state and the second-most productive in the Los Angeles Basin. Discovered in 1924 and in continuous production ever since, in 2012 it produced approximately 2.8 million barrels of oil from some five hundred wells. Since 1924 it has produced almost 400 million barrels, and the California Department of Oil, Gas and Geothermal Resources (DOGGR) has estimated that there are about 30 million barrels remaining in the field's one thousand acres, recoverable with present technology.
WThe Long Beach Oil Field is a large oil field underneath the cities of Long Beach and Signal Hill, California, in the United States. Discovered in 1921, the field was enormously productive in the 1920s, with hundreds of oil derricks covering Signal Hill and adjacent parts of Long Beach; largely due to the huge output of this field, the Los Angeles Basin produced one-fifth of the nation's oil supply during the early 1920s. In 1923 alone the field produced over 68 million barrels of oil, and in barrels produced by surface area, the field was the world's richest. The field is eighth-largest by cumulative production in California, and although now largely depleted, still officially retains around 5 million barrels of recoverable oil out of its original 950 million. 294 wells remained in operation as of the beginning of 2008, and in 2008 the field reported production of over 1.5 million barrels of oil. The field is currently run entirely by small independent oil companies, with the largest operator in 2009 being Signal Hill Petroleum, Inc.
WThe Los Angeles City Oil Field is a large oil field north of Downtown Los Angeles. Long and narrow, it extends from immediately south of Dodger Stadium west to Vermont Avenue, encompassing an area of about four miles long by a quarter-mile across. Its former productive area amounts to 780 acres (3.2 km2).
WThe Mesa Oil Field is an abandoned oil field entirely within the city limits of Santa Barbara, California, in the United States. Discovered in 1929, it was quickly developed and quickly declined, as it proved to be but a relatively small accumulation of oil in a single geologic formation. While the field was active in the 1930s, residential development in most of the Mesa neighborhood of Santa Barbara came to a halt. The field included two major productive areas with a total surface extent of only 210 acres (0.85 km2), and produced 3,700,000 barrels (590,000 m3) of oil during its brief lifetime.
WThe Oklahoma City Oil Field is one of the world's giant petroleum fields and is located in Oklahoma City, Oklahoma in the United States of America. The field was opened just south of the city limits on December 4, 1928, and first entered Oklahoma City limits on May 27, 1930.
WThe Salt Lake Oil Field is an oil field underneath the city of Los Angeles, California. Discovered in 1902, and developed quickly in the following years, the Salt Lake field was once the most productive in California; over 50 million barrels of oil have been extracted from it, mostly in the first part of the twentieth century, although modest drilling and extraction from the field using an urban "drilling island" resumed in 1962. As of 2009, the only operator on the field was Plains Exploration & Production (PXP). The field is also notable as being the source, by long-term seepage of crude oil to the ground surface along the 6th Street Fault, of the famous La Brea Tar Pits.
WThe Santa Clara Avenue Oil Field is an oil field in Ventura County, California, about six miles southeast of the city of Ventura and four miles northeast of Oxnard. It is produced entirely from two walled drilling islands along Santa Clara Avenue, each containing multiple directionally drilled wells. The field is within an agricultural area being encroached on several sides by urban development. As of 2010 the field reported 1,335,000 barrels of recoverable oil remaining, and had 18 active oil wells.
WThe West Montalvo Oil Field is a large and productive oil field on the coast of Ventura County, California, in the United States, in and adjacent to the city of Oxnard, California. Discovered in 1947, it has produced approximately 43.7 million barrels (6,950,000 m3) of oil, and retains about 2.2 million recoverable with current technology, in both the onshore and offshore areas. The offshore portion of the field is exploited from wells directionally drilled from onshore near McGrath Lake, from within an enclosure above the high-tide line at McGrath State Beach.