How do I use interval data for formation tops or ore grade in Voxler?

One way to create a geological model in Voxler is to fill the interval between the top and bottom of each layer with a numerical value corresponding to the layer. Attach a Gridder module to interpolate data throughout the rectangular volume, and attach an Isosurface module for each layer, specifying the a value that is the just below each layer value. Attach a VolRender module to fill the layers with color.  Attach a ScatterPlot module to view the borehole points in 3D.


For example, consider the following borehole data.


Borehole 1 at 456000 easting and 4123000 northing
Ground Elevation and top of alluvium: 5280
Depth to base of alluvium and top of Dakota formation: 280
Depth to base of Dakota and top of Morrison formation: 780
Total Depth of borehole: 1000


First convert the depths to elevations.


Ground Elevation and topo of alluvium: 5280
Top of Dakota: 5000
Top of Morrison: 4500
Total Depth: 4280


Fill the intervals with numeric values for each formation. I'll use 1 for alluvium, 2 for the Dakota, and 3 for the Morrison.


456000, 4123000, 5280, 1
456000, 4123000, 5200, 1
456000, 4123000, 5100, 1
456000, 4123000, 5000, 2
456000, 4123000, 4900, 2
456000, 4123000, 4800, 2
456000, 4123000, 4700, 2
456000, 4123000, 4600, 2
456000, 4123000, 4500, 3
456000, 4123000, 4400, 3
456000, 4123000, 4300, 3
456000, 4123000, 4280, 3


Repeat for the other boreholes in the area and save all the points in a single data file. Load the data file, attach a Gridder module and grid the data. You may need to apply gridding and search anisotropy if the XY range is much larger than the Z range. Attach an Isosurface module and specify a value of 1.99 to show the top of the Dakota. Attach another Isosurface module and specify a value of 2.99 to show the top of the Morrison. Attach a VolRender module to fill the layers with color.


 In this example I used a depth interval of 100. You may wish to use a smaller interval if the features you wish to depict are smaller. When you grid the data specify a smaller Z interval for more grid lines in the Z direction and better resolution.


Updated December 3, 2015

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