This is a well log used in the oil and gas industry. You could find this abbreviation
CMRP_MW in your log evaluation software or any (ASCII) log files provided by the logging company. The acronym stands for
'CMR Porosity - Multi Wait'. This log is not used too often in the industry. Use this log to investigate the apparent formation porosity as measured with an nuclear magnetic logging device.
Furthermore, this can be explained by looking at the apparent porosity. This can be explained as being the initial estimate of porosity, normally from logs, not corrected for the (often large) effects of clays, gas, etc. Such estimates should only be used for qualitative interpretation of clean, gas-free intervals. In general this log therefore displays units of the volume fraction. In other words, the ratio of the volumes occupied by two components, or by one component to the total volume of the system.This log usually has the unit
'Porosity'. This is the pore volume per unit gross volume. Porosity is determined from measurements on cores or interpreted from logs.
Data for this log is produced by a tool that uses a nmr logging technique and can be used to investigate the porosity of the formation. Similar logs are listed below: