Factual data are presented concerning the accumulation of oil in continental sediments at the South Belridge oil field. Included are the structure and stratigraphy of the field, the reservoir characteristics of the sediment and the properties and distribution of the oil and associated waters. The lithology, organic content, and included fluids of adjacent marine sediments are discussed with the objective of making tentative suggestions as to the origin, migration, and accumulation of the oil.

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