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Petra generates and shows a computer-generated grid in two different steps. The first step is to create a grid, and the second step is to display contours or color fills based on that grid. Grids can also be used in calculations, are easily used in volumetric estimations, and can quickly highlight different aspects of the same map by modifying Color bars.
For a more general guide, see "How to Make a Contour Map."
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Create a Grid
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Contour a Grid
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Hide a Contour
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Regenerate Grid and Contour
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Getting Started
Creating a grid from well data
Adding color contours and/or contour lines to a grid
Adding interpretation to a grid
Adding a grid to a cross section profile
Advanced Tools
Exporting a grid to ASCII, Exporting a grid to other file formats
Resampling a grid
Performing a simple arithmetic and curvature analysis on a grid
Calculating an isopach from two grids
Applying an equation to one or more grids
Advanced modeling with grids
Interpolating seismic values from a grid
Calculating volumetrics from a grid
Grid operations
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