Create Lithology Voxel
Use the Create Lithology Voxel menu option (geogxnet.dll(Geosoft.GX.DrillHole.DHLithoVoxel;Run)*), to produce 3-D grid representation of geology, based on lithology down-hole data.
The option can be accessed from the following locations:
- The Voxel > Utilities menu
- The Add to 3D > Drillhole menu in 3D Viewer
- The DH-Plot menu of the Drillhole Plotting extension
Create Lithology Voxel dialog options
Minimum Curvature Gridding Options
Application Notes
*The GX tool will search in the "...\Geosoft\Desktop Applications \gx" folder. The GX.Net tools, however, are embedded in the geogxnet.dll located in the "...\Geosoft\Desktop Applications \bin" folder. If running this GX interactively, bypassing the menu, first change the folder to point to the "bin" folder, then supply the GX.Net tool in the specified format.
Cell Size
The default grid "Cell size" is determined using the same formula used to compute the default cell size for the voxel:
a) The extents in X, Y and Z are determined from the selected holes.
b) A volume is calculated from the extents.
c) The cell size is calculated for a single cube, assuming the volume is divided equally into 10000 individual cubes.
d) The value is rounded down to give a "nicer" value.
Compositing Gap
When processing a hole, the first step is to composite the data based on the lithological intervals. In other words, all consecutive items of the same type are joined together to make single from-to intervals, for example:
From To Value |
Becomes... |
From To Value |
0 5 A 5 10 A 10 15 B 15 20 B 20 25 A |
0 10 A 10 20 B 20 25 A |
Often there are gaps in the data, e.g., if a from-to interval has no value or if a from-to interval is missing altogether:
From To Value |
Or... |
From To Value |
0 3 A 3 5 5 10 A 10 15 B 15 20 B 20 25 A |
0 3 A 5 10 A 10 15 B 15 20 B 20 25 A |
In this situation, what should you do? Do we divide the top "A" section into two layers, or just make one layer? This is what the "Compositing gap" parameter is for. If the gap is less than or equal to the compositing gap value, then "interpolate" the lithological value over the interval, that is, assume the gap doesn't exist. So if the input gap value was 1.0, the above cases would reduce to:
From To Value |
0 3 A // Layer 1 for A 5 10 A // Layer 2 for A 10 20 B // Layer 1 for B 20 25 A // Layer 3 for A |
If the compositing gap value was 2.0, you would get:
From To Value |
0 10 A // Layer 1 for A 10 20 B // Layer 1 for B 20 25 A // Layer 2 for A |
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