The San Joaquin Basin in central California is one of the most historically prolific oil-producing basins in the United States. The basin contains some of the largest oil fields ever discovered in America, including Midway-Sunset, Kern River, Elk Hills, and Belridge — fields that have collectively produced billions of barrels of oil over more than a century. Kern County alone has produced more oil than most entire states. The San Joaquin Basin is dominated by heavy oil production using thermal recovery methods (steam injection), along with lighter oil in some deeper formations. We buy mineral rights, royalty interests, NPRI, and ORRI across the San Joaquin Basin.
Approximate location of the San Joaquin Basin shown in tan
Basin-level activity chart not yet available for the San Joaquin Basin. For current activity, see our rig count dashboard and the state production pages linked above.
The San Joaquin Basin is a large asymmetric structural basin in the southern Central Valley of California, bounded by the Sierra Nevada to the east and the Coast Ranges to the west. The basin contains up to 30,000 feet of Cretaceous through Pleistocene sediments. The primary productive formations include the Kern River Sands (shallow heavy oil at 500 to 1,500 feet), the Monterey Formation (organic-rich siliceous shale that is both a source rock and reservoir), the Tulare Formation, the Etchegoin Formation, and the Stevens Sandstone. The basin is characterized by heavy oil (10 to 15 API gravity) in the shallow fields along the western and southern margins, with lighter oil in the deeper formations. Thermal recovery methods — primarily cyclic steam stimulation and steamflooding — are the dominant production techniques for heavy oil.
The San Joaquin Basin is operated by a mix of California-focused companies and major independents. California Resources Corporation (CRC) is the largest operator, formed from the spinoff of Occidental Petroleum's California assets. Berry Petroleum (now Berry Corporation), Aera Energy (a Shell/ExxonMobil joint venture), and Crimson Resource Development are also major players. The basin's heavy oil operations require specialized expertise in thermal recovery, and the California regulatory environment (including GHG regulations and permitting requirements) adds complexity that favors experienced operators.
San Joaquin Basin mineral values are driven by the specific oil field, current production, the operator's thermal recovery program, and the California regulatory environment. The heavy oil pricing dynamic — California heavy crude trades at a discount to light oil benchmarks due to processing costs — affects valuations. However, the massive scale of San Joaquin fields and the very long productive life of steamflood projects support meaningful mineral values. California's complex and evolving regulatory environment, including potential future restrictions on oil production, is a significant factor in all San Joaquin Basin valuations.
Additional counties we cover within the San Joaquin Basin, sorted by recent oil and gas activity:
Heavy oil is crude oil with an API gravity below about 22 degrees, meaning it is denser and more viscous than conventional light oil. Most San Joaquin Basin production is heavy oil (10 to 15 API gravity) that requires thermal recovery methods — steam injection to heat the oil and reduce its viscosity so it can flow to the wellbore. Heavy oil sells at a discount to light oil benchmarks like WTI because it requires more refining. This pricing discount is factored into mineral valuations, but the extremely large reserves in San Joaquin heavy oil fields can still support meaningful values.
California has some of the most stringent oil and gas regulations in the country, including greenhouse gas emission requirements, enhanced permitting processes, and potential future restrictions on new drilling and thermal recovery operations. These regulatory factors are built into mineral valuations — California minerals typically trade at lower multiples than comparable production in more operator-friendly states. However, the underlying mineral property rights are constitutionally protected, and existing production continues to operate under current permits.
The San Joaquin Basin contains several of the largest oil fields in American history. Midway-Sunset (discovered 1894) has produced over 3 billion barrels. Kern River (discovered 1899) has produced over 2 billion barrels. Elk Hills (discovered 1911, formerly the Naval Petroleum Reserve) has produced over 1.5 billion barrels. South Belridge and North Belridge together have produced over 2 billion barrels. These fields continue to produce today, primarily through thermal recovery operations.