With the three-axis model, spatial continuity in your dataset is measured along three orthogonal axes. You also have the option to add theoretical variograms that project in additional directions of your choice, such as direction of your drillholes grid. Additionally, you can include downhole variograms and visualize them all in one window.
After running the model, you can use the Autofit Model option. This feature is particularly useful as it first calculates the downhole variogram to determine the nugget value in your data, then applies this information to the other three orthogonal axes simultaneously.
After running the model, you can use the Autofit Model option. This feature is particularly useful as it first calculates the downhole variogram to determine the nugget value in your data, then applies this information to the other three orthogonal axes simultaneously
While Autofit helps automate the process, you have the flexibility to manually adjust the axes if necessary. You can even lock the axes to fit your model more precisely according to your requirements.
You can choose different types of variograms, such as the Normal Scores Variogram, which is especially useful when applying Gaussian transformations to your data. If you transform your data using Gaussian techniques, it’s crucial to back-transform the variogram model parameters to their original units using the Normal Score Backtransform option.
There is also the option to normalize the variogram models based on variance, total sill, or a specific value. When normalizing to the total sill, the variograms within the model are used to compute the final sill value, which is then applied to calculate normalized or relative sill values.
These normalized values are saved in your variogram control file and included in your variogram report file.
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