Gather Attributes

The Gather Attributes module enables interactive AVA and AVO analysis of gathers and stacks, from calculating intercept and gradient to AVA stack rotations (EEI equivalent).

• Angle and offset muting of gathers
• Intercept and gradient
• AVA stack rotation (EEI equivalent)
• Polynomial analysis of AVO
• AGC and other gains (stacks and gathers)
• Band-pass filtering (stacks and gathers)
• Radon transform
• Correlation and autocorrelation

Intercept and Gradient

Create volumes of Intercept and Gradient from gathers in real-time. Because these are complete volumes, you can use them like any other: view them along arbitrary lines or time/depth slices; in stratigraphically flattened space; or draped on a horizon, to name a few.

AVA Stack Rotation

Left: near stack; Centre: far stack
Right: stack rotation of -62 degrees, highlighting a fluid effect in a sand wedge not obvious on the input angle stacks

AVA Stack Rotation is DUG’s implementation of Extended Elastic Impedance (EEI).  EEI can be defined as a constant angle projection of seismic data, designed to help discriminate between different AVA responses.

Different stack rotations or weighting functions can optimally enhance or suppress certain types of AVA.  One of the many things you can learn from the Rock module is which rotation angle should highlight specific fluid and lithology effects.