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Poisson's Ratio (PR)
This is an abbreviation for a well log used in the oil and gas industry. You could find this abbreviation PR in your log evaluation software or any (ASCII) log files provided by the logging company. Poisson's Ratio is the full name for this log. The business value of this log is often deamed high. Use this log to investigate the ratio of the transverse contraction of a body to its longitudinal extension when stretched. Typical values in minerals are from 0.15 to 0.3 (Carbonates:0.15, Sandstones:0.2, Shales:0.25).This log in unitless. Either the log measurements can not be expressed with a unit (eg. a ratio) or the unit is unknown to us.
Data from this log can be used to investigate the poisson ratio of the formation.