This is an abbreviation for a well log acquired after or during drilling. You could find this abbreviation HFOC in your log evaluation software or any (ASCII) log files provided by the logging company. The full name for this log used in the industry is 'APS High Resolution Near/Far Porosity Standoff Correction'. This log is not used too often in the industry.

This log can be used to evaluate the correction to a Porosity measurement.

Simply said, this is a log that describes the correction applicable to a measurement, to remove environmental effects or measurement errors; the unit quantity is determined by that of the data.

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 porosity of the formation. Similar logs are listed below:

• Smoothed CNP (Dolomite Matrix-Fixed Hole Size) (SPDF)
• Density Porosity, Limestone (DLIM)
• Smoothed Neutron Porosity (LS, SS, or DOL) With Temperature and Pressure Corrections Applied (NTCP)
• APS High Resolution Near/Array Corrected Sandstone Porosity (HASC)
• Compensated Neutron Porosity (CN)
• Smoothed Neutron Porosity (LS, SS, or DOL) With Subsequent Formation Salinity, Temperature, and Pressure Corrections Applied (NUCP)
• Smoothed Neutron Porosity (LS, SS, or DOL) With Subsequent Formation Salinity Correction Applied (NSCP)
• Neutron Porosity Dolomite, Borehole Corrected, Transmitted (NPDX)
• Real-Time CNP (Dolomite Matrix) (RND)
• Density Porosity Limestone, Memory (DPLM)