Attribute Description: Instantaneous bandwidth is a statistical measure of the seismic wavelet, but it relates to various physical conditions, representing seismic data bandwidth sample by sample. It is one of the high-resolution character correlators. It shows overall effects of absorption and seismic character changes.
Interpretation Use: This attribute may provide value because it:
- Represents the seismic data bandwidth sample by sample.
- Is a high-resolution character correlator.
- Shows overall effects of absorption and seismic character changes.
Since the distribution of this data is Gaussian in nature, a standard seismic colorbar can work.
In this example, we are using a yellow-red-black-white-black—blue-cyan colorbar which highlight the higher values in the histogram so that they stand out between the bright red and blue values.
Computation: Bandwidth (octaves) is based on Barnes’ (1993) suggestion that instantaneous bandwidth can be computed as:
Where ė(t) is the time or depth derivative of the envelope.
The variance with respect to the mean frequency/wavenumber (standard deviation) indicates the width of power spectral density distribution over a band of frequencies; hence we can use it as an indication of the spectral bandwidth. This equation measures the absolute value of the rate of change of envelope amplitude. Instantaneous bandwidth is a statistical measure of the seismic wavelet, but it relates to various physical conditions.
- Chopra, S. and K. J. Marfurt, 2007, Seismic attributes for prospect identification and reservoir characterization: Society of Exploration Geophysicists, Geophysical Developments #11.
- Taner, M. T., 2001, Seismic attributes: Canadian Society of Exploration Geophysicists Recorder, 26, no 7.