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

Thin Bed

Attribute Description:  One piece of information we can extract is the locations where instantaneous frequencies jump or go in the reverse direction. As we have discussed earlier, these jumps are indicative of closely arriving reflected wavelets. Therefore, the time derivative of the phase function will contain the indicators for thin beds, in the form of large variations of instantaneous frequency. Its smooth variation will relate to the bedding characteristics, which we will have to investigate further. 

Interpretation Use:  This attribute shows the interference zones in phase. It is a physical attribute since it relates to closely spaced events. It can be used in detailed studies

  • Can indicate overlapping events
  • Indicates thin beds, when laterally continuous
  • Indicates non-reflecting zone, when it appears laterally at random, like ‘salt and pepper’
  • Shows fin detail of bedding patterns

Recommended Colorbar: 

Since the distribution of this data is Gaussian in nature, normal seismic colorbars of preference can be used.

  Example colorbar and amplitude spectrum

Example colorbar and amplitude spectrum

Example:

 Vertical display of Thin Bed

Vertical display of Thin Bed

 Time slice of Thin Bed

Time slice of Thin Bed

 Frequency Spectrum

Frequency Spectrum

Computation: The thin bed indicator is, therefore, computed as the difference between the instantaneous and the time-averaged frequencies:

Thin Bed - 5.png

References:

  • Taner, M. T., 2001, Seismic attributes:  Canadian Society of Exploration Geophysicists Recorder, 26, no 7.