Gather Attributes
The Gather Attributes module provides an indispensable toolkit for analysing and processing image gathers. It includes essential tools such as velocity and RMO picking, NMO and RMO correction, gains, muting, stacking, Radon, Tau-P and FX transforms and more. It enables interactive AVA and AVO analysis of gathers and stacks, including intercept and gradient calculations and AVA stack rotations (EEI equivalent).
- 3D dip and azimuth
- Low-frequency model building
- AGC and other gains (stacks and gathers)
- Polynomial analysis of AVO
- Angle and offset muting of gathers
- Radon transform and demultiple
- Apply and remove NMO
- Radon, FK and FX transforms
- AVA stack rotation (EEI equivalent)
- RMO picking and correction
- Intercept and gradient
- Spectral balancing and shaping
- Band-pass filtering (stacks and gathers)
- Stacking
- Convert gathers between offset and angle
- Structurally oriented filtering
- Convolution, deconvolution, FX decon
- Velocity model-building (from checkshots)
- Correlation and autocorrelation
- Velocity picking and delta model building
- Dip, Q, Cadzow and K filtering
- Volume CRS conversion
- Header and trace interpolation
- Weighted trace mixing
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. For example: view them along arbitrary lines or time/depth slices; in stratigraphically flattened space; or draped on a horizon.
AVA Stack Rotations
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 Rotations are 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.
