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It is therefore sometimes used as input to auto-trackers.
Frequency Attributes
Low-frequency shadows beneath bright spots are often used as a substantiating hydrocarbon indicator. The explanation for this is the abnormal high attenuation in gas-filled reservoirs.
River channels often have little variation in frequency within the channel whereas the variation in frequency have larger variation.
Instantaneous Frequency
Rate of change of the Instantaneous Phase: ωC=dφ/dt.
Represents the mean of the instantaneous power spectrum and its unit is Hz.Is independent of phase and amplitude, and is useful in indicating reservoir rock properties such as hydrocarbon, fracture zone detection , and changes in thickness
Instantanous Bandwidth
Defined as the absolute value of the derivative of the Envelope divided by the Envelope: ωB=|dEnvelope/dt|/Envelope.
Represents the standard deviation of the instantaneous power spectrum about its mean and its unit is Hz.
Dominant Frequency
Defined as the Root Mean Square of the Instantaneous Frequency and the Instaneous Bandwidth: ωRMS=√(ωB^2+ωC^2).
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