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Near Quality (QN)
This is an acronym for a well log used in the oil and gas industry. You might have encountered this acronym QN in your log evaluation software or any (ASCII) log files provided by the logging company. Near Quality is the full name for this log. This log is not often acquired after (or during) drilling a well. The values of this log represent the property used to indicate quality or confidence of data from a density logging survey.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 for this log is produced by a tool that uses a density logging technique and can be used to investigate the acquisition process. Similar logs are listed below: