Attribute Description: The Envelope attribute is one of the early complex trace attributes generated by Turhan Tanner, and Sven Treitel. It forms the basis for many of the other single trace attributes used today. It is the length of the vector between the Real and Imaginary trace (Hilbert Transform).
Interpretation Use: This attribute may provide value by:
- Representing the layer based reflectivity
- Acting as a DHI indicator
- Highlighting thin bed tuning effects
- Showing boundaries of sequences and depositional environments
- Major lithologic changes
- Showing layer effects over boundary effects
Since the distribution of this data is all positive, highlighting the very high values with unique colors, and using a gradational colorbar for the rest seem to highlight anomalous areas.
Computation: The formula is comprised of the square root of the sum of the squares of the real and imaginary traces, or the Euclidian distance:
For a more detailed explanation of Envelope and other complex attributes, please read “Complex Trace Attributes” in this help section.
- Taner, M. T., 2001, Seismic attributes: Canadian Society of Exploration Geophysicists Recorder, 26, no 7.