This is a log of measurements along a well bore (a well-log). The acronym TCMR_SIG is a unique identifier to recognize this particular log and can be encountered in your log evaluation software or your corporate datastores. The official name for this log is 'Standard Deviation of Total CMR Porosity'. Usage of this log is not high and encountering it is a rare occasion.

Use this log to investigate the statistical standard deviation from the mean value for some data; normally abbreviated a lowercase sigma; the unit quantity is determined by that of the data.

In general this log thus reflects units of the statistical property (A property of statistical nature, e.g. Standard Deviation, Average or Mean, Median, etc).

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 from this log can be used to investigate the any object. Similar logs are listed below:

• High Resolution Short-Spaced Quality Indicator (HQSS)
• HILT porosity Quality Indicator obtained by comparison between uncorrected and corrected thermal neutron porosity (QCPOR)
• Warning Flag for STONELEY (WFST)
• Standard Deviation of CMR Free Fluid (CMFF_SIG)
• Array Induction Quality Control Borehole Formation Ratio (ABFR)
• Standard Deviation of Bound Fluid Volume (BFV) (BFV_SIG)
• Array Induction End Of Casing Effect Flag (AECEF)
• Warning Flag for Shear (WFSH)
• APS Porosity Quality (QSDP)
• Warning Flag for Compressional (WFC)