| OpendTect dGB Plugins User Documentation version 4.2 |
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The CCB analysis window has the two following functions:
- It displays an histogram presenting the number of collected traces per bin (post-stack), or the histogram of amplitudes along the horizon (pre-stack).
- It allows choosing the type of display for the output stack, the stacking type used, and outputing the stacked traces to a 3D cube.
The X-axis of the histogram presents bin values in the Z unit of the survey. The Y-axis is the number of traces collected per bin (the maximum count value is shown in the top middle of the histogram).
The display (when pressing the "Go" button) will be in a 2D viewer.
- 'Stack' will display the stacked traces wrt the bin depth (post-stack), or the amplitude along the horizon in a crossplot bin depth vs. offset (pre-stack).
- 'Single Z' will display all traces of a single bin before stack.
- 'Directional' will display a CCB-stacked amplitude map along the horizon as a function of the distance to a central position and the azimuth sector. The central position is pre-computed as the shallowest position with the selected area. It can be modified by the user, as well as the azimuthal sectors parameters.
Optionally, a 3D volume may be output. In this volume each input trace is replaced by the stacked trace of its corresponding bin. The output volume can then be used to make crossplots and update amplitude maps for instance.
Please note that the CCB main window remains open when using and after closing this CCB analysis window. Multiple analysis windows can be created, with different volume subselections for instance. Nevertheless the main CCB window must remain opened to perform the stacking.
Example of 2D stack
The following figure presents an example of 2D stack. Mind the increase of amplitude at 2130 ms. A crossplot of amplitude, frequency and phase is presented vs. bin depth is presented in the lower part. In the prestack CCB the crossplot shows AVO attributes (intercept, gradient, correlation coefficient) vs. bin depth.
Example of CCB directonal display
The following figure is an example of CCB directional plot. The colours represent the amplitude along the horizon. The grid represents the grid used for the binning of the seismic trace before stack.
