The Tejon-Grapevine field is in the Tejon Embayment which is located in the southerly part of the San Joaquin Valley. The embayment is bordered on the south by the Tehachapi Mountains and on the east by the Sierra Nevada Range.

The mountainous areas consist of Jurassic basement rock with a border of Pleistocene to Eocene sediments exposed between basement and valley alluvium. The forces that uplifted these mountain ranges, nearly at right angles to each other, and the rapid drop off of basement developed complex fault patterns and numerous unconformities.

The Tejon-Grapevine field, central area, has six major producing zones of Miocene age: Transition, Santa Margarita, Pulv., Valv., Olcese, and JV sand. Prior to discovery of Olcese production in June, 1954, production was 1,285 B/D. In July, 1955, after Olcese and JV sand discoveries, production was 7,615 B/D. To date, no production has been found below the lower Miocene volcanics.

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