The Oxnard oil field is a minor southern Ventura Basin field situated on the west flank of the southwesterly plunging Semi-Las Posas trend. The field consists of two pools, a shallow tar zone discovered in 1936 and the deeper Sespe pool discovered in 1952. Production from the tar zone is from truncated, fractured, Miocene shale and onlapping Pliocene sands. Sespe production is from three zones, each exhibiting short oil columns and rather narrow bands. Sespe accumulation is associated with a buried, faulted, half dome. There are also various stratigraphic modifications.

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