Verifying Horizons and Property Models

(Note: In all scripts and command lines that follow, a backslash ( \ ) at the end of a line indicates that the current line is continued on the line that follows. When creating the script or typing the command line, these lines should be entered as one continuous line without the backslash.)

When modeling horizons and properties from scattered data, one way to check the quality of the 2D and 3D grids produced is to back interpolate values from the grids to the scattered data locations. Back-interpolation can be calculated in the Formula Processor, but only between 2D or 3D grids and a data file or between a sequence file and a 3D grid. In the case of horizon gridding and property modeling within geologic models calculated from sequence files, the surface or property model is comprised of pieces of several grids (each representing the surface or property within different fault blocks), making it difficult to perform the back interpolation. Two programs provided in the $DGIHOME/ev5/dgi_gifts directory allow easier back interpolation calculations:

evhgbak - performs back interpolation to horizon grids
evpropbak - performs back interpolation to property grids

Both of these programs first ask for a sequence file name, then bring up a new interface for the calculation. The output files from these calculations contain the back interpolated value, the difference between the data file's Z or P value and the back-interpolated value, and the percentage difference between these.

Note: When horizon gridding uses both reference and adjustment data, the back interpolation is only calculated for the adjustment data file.

 
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Last updated: March 22, 2007