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Cumulative production of the Santa Maria district to January 1, 1947, was 250,637,000 barrels, of which an estimated 77 per cent was from fractured rocks and 23 per cent from oil sands. Seventy-four and one-half per cent of the oil was produced from fractured rocks in the Monterey formation and 2 per cent from fractured Knoxville sandstones. Monterey fractured rocks in order of importance include (1) Mohnian cherts, (2) Luisian calcareous shale, and (3) Mohnian platy siliceous and porcellaneous shale. The distribution, age, and character of fractured zones are illustrated by stratigraphic sections. The distribution of maximum chert development suggests chert originated as a sedimentary facies. General characteristics of potentially productive fractured rocks of the distri t are analyzed and their permeabilities and porosities, as indicated by production data, are discussed.
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