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RockWorks15 Grid Model Tools Chapter 15 - Grid Model Tools
Topics
Grid Model Tools - Overview ........................................................................................................ 209
Computing Grid Statistics ............................................................................................................ 209
Performing Arithmetic Operations with Grid Models ..................................................................210
Filtering Grid Models..................................................................................................................... 211
Editing Grid Models....................................................................................................................... 211
Directional Analyses & Directional / Flow Maps .......................................................................... 212
Trend Surface Analyses ................................................................................................................. 213
Morphing Grid Models .................................................................................................................. 213
Grid Import/Export Tools ............................................................................................................. 214
Grid Model Profiles & Fences ........................................................................................................ 215
Grid Stratigraphic Tools ................................................................................................................ 216
Grid Model Tools - Overview
Within the Borehole Manager you can create create grid models of stratigraphic surfaces
using the Borehole Manager’s Stratigraphy menu tools, and water level surfaces using the
Aquifer menu tools. You can also perform "basic" gridding of XYZ data using the
RockWorks Utilities Map / Grid-Based Map command. The program offers several
gridding methods to do this interpolation of your data. Each operates differently, and each
has strengths and differences. See "Gridding Methods", page 140.
The tools in the RockWorks Utilities Grid menu are used to summarize, manipulate, filter,
and illustrate existing numeric grid models.
Computing Grid Statistics
The Grid menu’s Statistics utility is used to get a general summary of the contents of an
existing grid (GRD) file. The computations are reported as a:
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Textual report, in which the summary of grid node values and computed statistics are
displayed in a document in a text editor. Use this to confirm grid dimensions, view
volumes, G value ranges and standard deviations.
Plottable frequency histogram of the node values, reported as numbers or percent.
This can be used to compare the G value distribution for models interpolated with
different algorithms, and to look for anomalies.
Plottable "Krajewskigram" or X,Y scattergram of original Z values (X-axis) versus
computed node values (Y-axis). You can use this to gauge the accuracy of the grid
model and view some error analysis.
Computed grid residuals, representing the difference between observed XY values
and computed grid values at the same locations.
New grid anomalies model, created in batch from multiple grid models, to highlight
areas where multiple variables show anomalous tendencies.
Standard deviations of grid node values. This can be helpful in isolating
anomalous areas.
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