Geophysical Insights hosting the 2018 Oil & Gas Machine Learning Symposium in Houston on September 27, 2018
Introduction to Machine Learning for Multi–Attribute Interpretation and AASPI attributes - A 1-day, DGS Continuing Education course in Denver, CO on September 18th
Dr. Tom Smith presenting on Machine Learning at the 3D Seismic Symposium on March 6th in Denver
What is the "holy grail" of Machine Learning in seismic interpretation? by Dr. Tom Smith, GSH Luncheon 2018
Using Attributes to Interpret the Environment of Deposition - A Video Course. Taught by Kurt Marfurt, Rocky Roden, and ChingWen Chen

Envelope Bands on Phase Breaks

Attribute Description:  The Phase Breaks trace reflects the discontinuities in the phase. The Envelope Bands (Energy Bands) give the average energy of the envelope between adjacent pairs of phase breaks. This identifies regions of strong energy.

  Top trace is the amplitude trace. Lower Trace is Envelope Bands on Phase Breaks

Top trace is the amplitude trace. Lower Trace is Envelope Bands on Phase Breaks

Interpretation Use:  This attribute may provide value by:

  • Identifying areas of strong energy and thus weak energy
  • Showing boundaries of sequences and depositional environments
  • Showing discontinuities and faults

Recommended Colorbar: Since this is an average of envelope between phase discontinuities, the same colorbar for phase discontinuities or envelope can work. The colors are designed to focus on the higher energy intervals in the seismic. Note the values are positive.

  Example Color bar and Amplitude spectrum

Example Color bar and Amplitude spectrum

Example:

 Vertical display of Envelope Bands on Phase Breaks

Vertical display of Envelope Bands on Phase Breaks

 Time slice of Envelope Bands on Phase Breaks

Time slice of Envelope Bands on Phase Breaks

 Frequency Spectrum

Frequency Spectrum

Computation: The energy bands on phase breaks attribute integrates by summing the envelope signal between adjacent pairs of phase breaks. Where the envelope is small the integrated value is small and the block value assigned to each sample between pairs of phase breaks is small. If the envelope is large, the block envelope value between phase breaks is large. This type of attribute helps identify regions of strong energy. The computation steps are as follows.

Integratee the envelope signal between an adjacent pair of peak pick times amd tp yield a value which will be assigned as a constant to all samples in that range (δ(tj)) and repeat these integration / assingment steps for each park of pick times (2 to N).

Envelope Bands on Phase Breaks - 06.PNG

This result is the energy bands on phase breaks attribute.

For a more detailed explanation of Banded attributes and how they are calculated, read the “Banded Attribute Overview” help document.

References:

  • Taner, M. T., 2001, Seismic attributes:  Canadian Society of Exploration Geophysicists Recorder, 26, no 7.
  • Tom Smith, 2017, Paradise Instantaneous Attributes