The Aliso Canyon Oil Field (also Aliso Canyon Natural Gas Storage Field, Aliso Canyon Underground Storage Facility) is an oil field and natural gas storage facility in the Santa Susana Mountains in Los Angeles County, California, north of the Porter Ranch neighborhood of the City of Los Angeles.

Discovered in 1938 and quickly developed afterward, the field peaked as an oil producer in the 1950s, but has remained active since its discovery.

[1] Three operators were active on the field: Southern California Gas Company, The Termo Company, and Crimson Resource Management Corp.[2] The field is on the southern slope of the Santa Susana Mountains, an east-west trending range dividing the San Fernando Valley on the south from the Santa Clarita Valley on the north-northeast.

[3] The main entrance to the oil field is on Limekiln Canyon Trail where it intersects Sesnon Boulevard.

[4] The Michael D. Antonovich Open Space Preserve abuts the field on the northeast, and numerous parks in Porter Ranch are adjacent on the south.

[13] Early in production, the Sesnon-Frew zone had been identified as having a strong gas cap, with some wells being completed in gas-only portions of the reservoir, needing to be deepenend.

The State Oil and Gas Supervisor ruled in favor of Standard and Tidewater and limited production on the Sesnon pool to reduce the waste.

Many of these projects were master-planned developments, including gated communities, in one of San Fernando Valley's most affluent areas.

Aliso Canyon was ideally placed near the center of SoCalGas's service region, and connected to the system by an extensive pipeline network.

[20] In 2009 SoCalGas proposed an expansion and upgrade of the storage facility involving replacement of the obsolete gas turbine compressors with more up-to-date electric versions.

It would also move guard houses and some other structures, build a substation on the field, and upgrade various transmission and telecommunications lines.

[24] In 2008, one well – "Porter 50A" – was found to have a gas pressure of 400 pounds per square inch on the surface annulus, an indication of a serious underground leak and potential safety hazard; this well was immediately removed from service, and on investigation corrosion was discovered along a 600-foot stretch of the production casing, ending more than 1000 feet below ground surface.

[25] SoCalGas designed a Storage Integrity Management Program to address these deficiences, along with a budget, and presented it to the State Public Utility Commission in 2014.

[28] Fallout from the methane cloud, in the form of oily droplets and persistent noxious odors, caused the evacuation of over 6,000 families, who relocated to hotels and other rentals at SoCalGas's expense throughout the region.

[33][34] Governor of California Jerry Brown issued an executive order banning natural gas injection until all of the wells were thoroughly tested for corrosion and leaks.