Wilmington Field

California Resources Corporation (CRC) has oil and gas operations in Long Beach, California, where it has interests in the Wilmington Field, the third-largest oilfield in the United States based on cumulative production. CRC has a stake in over 80 percent of the properties that overlie the Wilmington Field, where we operate in collaboration with the State of California and the City of Long Beach. CRC's Long Beach operations include THUMS Long Beach Company, which operates the offshore portion of the Wilmington Field; Tidelands Oil Production Company, which operates the onshore portion of the Wilmington Field; and two additional smaller leases in the Long Beach area. In addition to the world-class Wilmington Field, CRC operates five Southern California fields: Huntington Beach, Sansenina, East Los Angeles/Bandini and Dominguez.

THUMS Long Beach Company

THUMS comprises four man-made islands in Long Beach Harbor that are owned by the City of Long Beach, as well as onshore facilities. The name THUMS is derived from the original consortium of operators. The THUMS islands were named after four astronauts who died in the line of duty in the early years of the U.S. space program. Island Freeman encompasses about 12 acres, while islands Grissom, White and Chaffee cover approximately 10 acres each.

Under the terms of an agreement between THUMS, the City of Long Beach and the State of California, the THUMS islands were designed to blend in with the surrounding coastal environment. Drilling rigs and other above-ground equipment are camouflaged and sound-proofed, and wellheads and pipelines are located below the islands' surface to enhance the appearance of the harbor and skyline.

THUMS' unique combination of production functionality, visual appeal and environmental and safety features has garnered the facility dozens of awards and recognition from local, state and national organizations. All four THUMS islands have been recognized by the Wildlife Habitat Council (WHC), a nonprofit organization that helps landowners enhance wildlife habitat, for commendable wildlife habitat management. Since 2004, the environmental team at THUMS has worked with WHC and community groups to establish and maintain California plant habitats on the islands.


Tidelands is the contractor that operates the West Wilmington Field for the City of Long Beach and the State of California. Tidelands' onshore production facilities and drilling operations are located in and around the Port of Long Beach. Advanced exploration technologies such as reservoir characterization have been employed in the field.