Translations:Dictionary:Dielectric log/1/en

{{#category_index:D|dielectric log}} A class of high-frequency, electric-logging sondes that operate at a single frequency in the MHz to low GHz range to measure formation effects of phase-shift, amplitude, and attenuation on a transmitted electromagnetic wave. Phase shift, related to dielectric permittivity, is treated as propagation time, t_p, a quantity virtually independent of salinity for water but significantly lower than for oil, gas, or rock materials. If the lithology is known, t_p (corrected for attenuation) may allow porosity determination. The dielectric log offers a means to calculate residual hydrocarbon saturation in the shallow flushed zone.