| OpendTect dGB Plugins User Documentation version 4.2 |
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This statistical attribute makes local averages according to a given 3D horizon. Its primary application is the filtering of seismic data in the depth domain with the aim of removing the structural footprint and enhancing hydrocarbon-related flat spots. The output is a 3D volume with the same geometry as the input volume.
This attribute is comparable to the volume statistics attribute: The data is extracted in a user-defined radius within a time gate, and a statistic is output (average, median, RMS). The default time gate is +/- half the survey sampling rate.
The main difference is that only positions that have the same distance (+/- the time gate) between the actual sample and the pick of the 3D interpretation will be kept for the computation of the statistic. All other will be discarded. Therefore the samples extracted could be looked as a portion of contour lines computed from the 3D horizons, and shifted at the depth of the actual sample.
The radius of the data selection corresponds to the aperture of the migration: It limits the amount of data in a lateral sense collected and used by the stacking operator. Its unit should be a real world length in the same unit as the survey coordinates.
