Computing variograms on 3D seismic amplitudes or related attributes must deal with structural dipping. Vertical variograms are always useful to compute as they correspond to the main processing direction (trace signal processing). But usual horizontal variograms are useless most of the time as they reflect the structural dipping much more than the horizon consistent amplitude variations.<br>A number of computing strategies have then been developed to tackle this problem such as horizontalisation from a key horizon, use of dip azimuth cube … and they all of course require an a priori input of the structural features of the amplitude cube to guide the variogram computation.<br>Mathematical morphology has been successfully applied to seismic cubes to provide an automatic a priori 3D segmentation that may be directly input into the variogram computation.<br>


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