This is an abbreviation for a well log used in the oil and gas industry. You could find this abbreviation BFV_SIG in your log evaluation software or any (ASCII) log files provided by the logging company. The acronym stands for 'Standard Deviation of Bound Fluid Volume (BFV)'. This log is not used too often in the industry.

This log can be used to evaluate 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.

Furthermore, this can be explained by looking at 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:

• PEF Ratio, Bottom Quadrant, Real-Time (PERB)
• High Resolution Short-Spaced Quality Indicator (HQSS)
• Warning Flag for STONELEY (WFST)
• Array Induction Quality Control Borehole Formation Ratio (AHBFR)
• Warning Flag for Compressional (WFC)
• Log Quality Control in Americium Upper Window (LQCU)
• Bulk Density Quality Curve (BDQC)
• Confidence Delta-T High Resolution Receiver (CDTR)
• Standard Deviation of CMR Porosity (CMRP_SIG)
• Bond Index Level for Isolation (BILI)