This is an abbreviation for a well log used in the oil and gas industry. You could have found the code
SFSC in your log evaluation software or your corporate datastores.
Smoothed Far Detector ONLY Porosity (Sandstone Matrix-Caliper Corrected) is the offical name for this log. This log is not used too often in the industry. This log helps to evaluate the porosity derived from a neutron logging measurement, assuming that the rock matrix material is quartz.
Simply said, this is a log that describes the porosity as measured with an neutron logging device. At a more general level these values are measures of the apparent porosity. Better said, 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 thus reflects units of the volume fraction. This is a measure of 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 neutron logging technique and can be used to investigate the porosity of the formation. Similar logs are listed below: