Micro Spherical Focused Logging
The Micro Spherical Focused Logging (MSFL) uses a pad mounted electrode system to measure flushed zone resistivity (Rxo). The Rxo measurement is used in calculating flushed zone water saturation (Sxo). When combined with deeper reading resistivity measurements it is an excellent indicator of movable hydrocarbons and true formation resistivity (Rt). MSFL tool has very-fine vertical resolution and is excellent for delineating thin beds.

Measure flushed zone resistivity
Calculate flushed zone water saturation
Indicate movable hydrocarbons
Estimate invasion diameter
Correct deeper-reading resistivity devices for invasion effects
Delineate thin beds