The Richfield field lies in northeastern Orange County near Yorba Linda and Atwood, on the southern flank of the Puente Hills where the Los Angeles Basin gives way to rising country. Production dates to about 1919, in the same era that opened the great Los Angeles Basin fields, and the field shares its name with the old Richfield Oil Company whose brand once appeared on filling stations across the West. Today it is a mature urban field whose royalty owners are typically heirs of families who held land here before the citrus groves became subdivisions.
Northeastern Orange County came into production around 1919, when the Los Angeles Basin was being drilled at extraordinary speed and every anticline within reach of a rig was being tested. Richfield developed alongside the larger Brea-Olinda field a few miles west, producing from Miocene sands on the flank of the Puente Hills. Development in that first decade was fast and closely spaced, which is why mineral title in this part of Orange County is divided into small parcels and small decimals to this day.
The field followed the standard Los Angeles Basin arc: strong early flush production, rapid pressure decline as offset wells drained the same sands, and then a long secondary phase. Waterflooding became the mechanism for extending life, restoring reservoir pressure and sweeping oil toward producers well past the point primary recovery would have ended. Output settled into stripper rates decades ago, and Richfield today is a small producer by any measure — but a durable one, which is the pattern across the basin’s older fields.
What has changed most around Richfield is the surface. Citrus groves gave way to Yorba Linda and Placentia, and oil operations that once stood in open country now sit among houses, schools, and commercial development. That transition brought setback rules, local land-use scrutiny, and idle-well obligations that did not exist when the leases were written. For mineral owners, the practical consequence is that new drilling in this part of Orange County is difficult, and the value of an interest rests mainly on existing wells.
Richfield produces from Miocene sands along the southern flank of the Puente Hills, at the northeastern edge of the Los Angeles Basin. Traps here combine folding associated with the Whittier fault system with stratigraphic changes in the sand bodies, and pay is generally found at moderate depths rather than in the very deep pools that characterize the basin’s center. The Los Angeles Basin is among the most oil-rich sedimentary basins on earth per unit of volume, and even its smaller fields hold reservoirs that would be significant elsewhere.
Waterflooding has been the principal enhanced-recovery method at Richfield, as across most Los Angeles Basin fields, where injecting water into the producing sands restores pressure and sweeps oil to producers. Injection is permitted by CalGEM. The larger constraint here is not subsurface but surface: California’s setback requirements for wells near homes and schools, local land-use authority, and idle-well management rules all bear on what an operator can do in a built-out part of Orange County. Those rules shape future royalty volumes directly.
Richfield interests are small, long-lived Orange County royalties whose future depends far more on regulation and surface development than on the reservoir itself. Many are held by descendants of families who owned ranch or grove land here a century ago and who now live nowhere near it. Valuing one properly means looking at the specific leases, the operator, and the local regulatory picture rather than at basin-wide statistics. We buy minerals and royalties in Orange County and provide free written offers.
County-level well data, production charts, and selling guides for the counties this field spans:
The field and the company share the Richfield name, which traces to the locality in northeastern Orange County. The company grew into a major West Coast refiner and marketer and later merged into what became ARCO, so the name is far better known than the field itself.
It is difficult. The field sits under built-out parts of Yorba Linda, Placentia, and Atwood, where setback rules, local land-use authority, and surface access all limit new work. Most Richfield royalty value therefore rests on existing wells rather than future drilling.
Frequently yes, though amounts vary widely with the decimal and the leases involved. Small Los Angeles Basin interests have an active market. A free written offer gives you a real number instead of an estimate drawn from old check stubs.