Accumulation of oil in the Aurignac sand of the San Ardo field appears to contradict all of the textbook examples and theories of accumulation. Bottom water is structurally higher than oil. This peculiar type of accumulation is explained as a lack of adjustment of the heavy oil after post-accumulation movement.

A detailed study of this unorthodox accumulation may suggest a new approach to the exploration for oil, particularly in heavy oil areas.

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