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The Castaic Junction oil field, discovered in 1950, is one of the four or five major producing structures in the easternmost Ventura basin. Development has been continuous since discovery, and at present there are 58 wells in the field which have been drilled to an average depth of 11,000 feet. At the surface, the Castaic Junction structure appears as a southeast-plunging nose but the deeper beds are folded into an east-trending closed anticline. The three producing zones in the field, all in the Mohnian stage of the upper Miocene, are designated Zones 10, 15, and 21. Closure in Zone 10 is afforded by a pinch-out across the crest of the structure, but accumulation in the two lower zones is controlled primarily by the closed structure. Subsurface work in the field has resu ted in a better understanding of the abrupt stratigraphic variations common in this part of the Ventura basin.
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