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Growth History of Oil Reserves in Major California Oil Fields During the Twentieth Century, Chapter H of the Geologic Engineering , and Assessment Studies of Reserve Growth

机译：二十世纪加州主要油田石油储量增长史，地质工程H章和储量增长评估研究

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Oil reserves in 12 of California's 52 giant fields (fields with estimated ultimate recovery >100 million barrels of oil) have continued to appreciate well past the age range at which most fields cease to show significant increases in ultimate recovery. Most of these fields were discovered between 1890 and 1920 and grew to volumes greater than 500 million barrels in their first two decades. Growth of reserves in these fields accelerated in the 1950s and 1960s and is mostly explained by application of secondary and tertiary recovery techniques, primarily waterflooding and thermal recovery. The remaining three-fourths of California's giant fields show a pattern of growth in which fields cease to grow significantly by 2030 years following discovery. Virtually all of these fields have estimated ultimate recoveries less than about 500 million barrels and most are in the 100-200 million barrel range. Three of six offshore giant fields, all discovered between 1966 and 1981, have shown decreases in their estimated ultimate sizes within about the first decade after production began, presumably because production volumes failed to match initial projections.

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