Objective:
I would like to create a composite lithology so instead of e.g. shale, greywacke, and siltstone, it's called Sedimentary Rock, for example.
Resolution:
To create a major composite lithology, you will need to have a channel in your Lithology database with the major rock type category such as sedimentary, igneous, etc. Once you have this channel on your database, you can create a composite database.
There are a few ways to accomplish this:
- Creating a channel on the Lithology database and manually assigning a major rock type to each lithology
- Creating a channel on the Lithology database and using Channel Math tool to assign a major rock type to each lithology
- Editing your raw data on Excel
- Manual assignment
- Open the Lithology database.
- Right-click on an empty channel header, and click on New...
- Give the channel a name e.g. Major_Lithology. Change Data type to String.
- Enter the information "Sedimentary, Igneous, etc" accordingly.
- Using the Channel Math tool
- Open the Lithology database.
- Right-click on an empty channel header, and click on New...
- Give the channel a name e.g. Major_Lithology. Change Data type to String.
- Database tools > Channel math
- Create an expression that best represents your data. Here is a math expression that you can start with: C0 = (C1=="X") ? ("SED") : (C0);
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- C0=The new channel created,
- C1=Rock channel,
- X=lithology of your interest
- SED= the classification you would like to give to "X" lithology.
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- You can repeat the process for Igneous, Metamorphic and so on, just by replacing the target lithology and the classification name.
- Editing your raw data on Excel
- Add a table for a major lithology to your spreadsheet and save
- On Target, use the Refresh/Reimport button on DH-Data menu.
- Once you have the new channel on your database, you can create a composite database by going to DH-Data > Composite Database and using the lithological interval.