Tutorial: Run a Stratigraphy Volume Report

Estimated time: 1 minute.

Finally, let’s run a quick volume report for the stratigraphic layers. The computed totals will be displayed in a RockWorks datasheet tab.

We assume that you have gone through the Stratigraphy Model lesson, and in that lesson created a solid model of the layers, saved in a file Stratigraphy.RwMod for volume computation.

1. Back at the main RockWork program window, choose the Stratigraphy | Solid Volumetrics option.
   
2. Stratigraphy Volumetrics:
   • Stratigraphic Solid Model: Click here to browse for your model, named Stratigraphy.RwMod.
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   • Intervals:
     • Every Layer.
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   • Output Options:
     • Nodes: Uncheck this.
     • Volume: Check this.
     • Mass: Uncheck this.
     • Percent: Check this.
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   • Decimals: This can be set to 0.
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3. Output Options: Click this tab to choose the desired report format.
   • RwDat (RockWorks): Choose this option to output the report to a RockWorks datasheet format. The other formats can be unchecked.
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4. Click Continue button to proceed.
   

   RockWorks will create a data tab where it will display the total volume for each defined formation at every layer in the solid model. It will also display percent of that type for that layer. If you scroll down to the bottom of the data listing, the overall totals for each formation will be displayed.

5. To save this datasheet, click on the File | Save option at the top of the datasheet, and type in the name:   Stratigraphy Volumes    and click Save. The program will append the .RwDat file name extension automatically. These are files that you can open into the RockWorks datasheet.
   
6. If the RockPlot3D window containing your stratigraphic model is still open, you can compare the volume notations there with those in the datasheet. They'll likely be different because they represent different methods of computing volumes. The surface-based volumes, as displayed in the RockPlot3D window, are probably the more accurate since they are slightly less dependent on the resolution of the models as is the solid-based volume report.
   
7. If you have a moment, you can return to the main menu and run the Stratigraphy | Volumetrics (Based on Surface Models) option, to compare the calculations. Generally, the volumes computed for the surface-based model will be more accurate than the volumes computed for the solid-based model.

This is the end of the tutorial for stratigraphy data. The next section contains lessons for downhole interval-sampled data.

Computing Stratigraphy Volumes

  Back to Stratigraphy menu     |     Next (I-Data Diagrams) 

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