Smoothed Frequency is the time-average of the Instantaneous frequency. Since instantaneous frequencies are influenced by the bed thickness, it is best to observe them without too much interference. One approach to addressing the reversals is accomplished by applying a time-average smoother to the frequency which will smooth through the reversals.
The main use for this attribute is in calculation of the Thin Bed attribute which is the difference between the instantaneous and time-weighted frequencies.
- Corresponds to the average frequency (centroid) of the amplitude spectrum of the seismic wavelet
- Seismic character correlator
- Indicates the edges of low impedance thin beds.
- Hydrocarbon indicator by low frequency anomaly. The unconsolidated sands, due to the oil content of the pores, sometimes accentuate this effect.
- Fracture zone indicator appear as low frequency zones
- Chaotic reflection zone indicator
- Bed thickness indicator. Higher frequencies indicate sharp interfaces or thin shale bedding; lower frequencies indicate sand rich bedding
- Sand/shale ratio indicator
This attribute usually has a Gaussian distribution centering around a dominant frequency. Using a lighter color for the dominant frequency will allow highlighting of lower and higher frequencies if desired. Often bands of colors can be used to highlight specific ranges. Here we are using the same colorbar as we did for the instantaneous frequency
- Taner, M.T., 2003, Attributes Revisited, http://www.rocksolidimages.com/attributes-revisited/.