Dictionary:Spherically focused log (SFL)

{{#category_index:S|spherically focused log (SFL)}} A short-normal resistivity device to which current-focusing electrodes have been added to maintain approximately a spherical distribution of the measuring current for better thin-bed resolution and response even with high formation-to-mud resistivity contrast. Acts to prevent current travel in the borehole. SFL is a Schlumberger trade name.