This is an abbreviation for a well log acquired after or during drilling. You might have encountered this acronym
CRGM in your log evaluation software or any (ASCII) log files provided by the logging company. The official name for this log is
'Enhanced processing medium conductivity'. This log is not often acquired after (or during) drilling a well. This log can be used to evaluate the conductivity, made by an induction log, which represents a measurement made approximately two to three feet into the formation.
Simply said, this is a log that describes the conductivity which represents a measurement made approximately two to three feet into the formation; generally considered to measure the formation where it contain fluids which are a mixture of mud filtrate, connate water and possibly hydrocarbons.This log usually has the unit
'Conductivity'. This is the quantity of electricity transferred across unit area per unit potential gradient per unit time. In isotropic material, it is the reciprocal of Resistivity. Sometimes called Specific Conductance.
Data for this log is produced by a tool that uses a induction logging technique and can be used to investigate the conductivitty of the formation. Similar logs are listed below: