Scientifically accepted geologic ideas have never explained certain types of oil accumulations, some of which are functions of subsurface plastic deformity that can vary with overburden. Plastic deformity is a reservoir property which when acknowledged and understood, helps explain the positions of known oil pools and conversely facilitates the bracketing of new deposits. A knowledge of plastic reservoir deformity resolves some annoying mysteries concerning well fracting, drill-stem test results, and very deep reservoir producing behavior.

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