Watch videos of Presentations from SEG 2017
Using Attributes to Interpret the Environment of Deposition - A Video Course. Taught by Kurt Marfurt, Rocky Roden, and ChingWen Chen
Dr. Kurt Marfurt and Dr. Tom Smith featured in the July edition of AOGR on Machine Learning and Multi-Attribute Analysis
Rocky Roden and Ching Wen Chen in May edition of First Break - Interpretation of DHI Characteristics using Machine Learning
Seismic interpretation and machine learning by Rocky Roden and Deborah Sacrey, GeoExPro, December 2016

LOGIN / MY PROFILE | LOG OUT

Bandwidth

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.

Recommended Colorbar: 

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. 

Amplitude spectrum of Bandwidth

Amplitude spectrum of Bandwidth

Example: 

Vertical display of Bandwidth

Vertical display of Bandwidth

Time slice of Bandwidth

Time slice of Bandwidth

Frequency Spectrum

Frequency Spectrum

Computation:  Bandwidth (octaves) is based on Barnes’ (1993) suggestion that instantaneous bandwidth can be computed as:

Bandwidth - 5.png
chrome

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.
 
References:

  • 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.