GEOVIA Dynamic Shells

Using the Sample Data Selection Wizard

Before Dynamic Shells opens, you are prompted to select the data that you want to use in Dynamic Shells using the Sample Data Selection Wizard.

Note: To select your data, you must be connected to the database that contains the drillhole samples you want to estimate.

The wizard consists of four forms:

  1. Select sample data
  2. Define geological zones
  3. Define Query Constraints
  4. Selected sample data summary

To select your data using the Sample Data Selection Wizard:

  1. On the Select sample data form:
    1. Choose the Table name.
    2. For each field you want to use, select it in the Available fields list, and click Add to add it to the Selected fields list.
    3. If you want to ignore negative samples, select the Ignore negative samples check box.
    4. When a negative sample is ignored, the estimation continues as if that sample did not exist. It does not set the sample to a value of zero. Leave Ignore negative samples cleared unless you are certain that negative samples should be ignored.

    5. Click Next.
  2. On the Define geological zones form:
    1. Select No zone definition, Multiple zones, or Zone From/To.
    2. You can use Multiple zones to limit the samples, that are input to dynamic shells, for example by rock type or by geological domain. To do so, you need to have a field for rock type, or a field for domain, in your database.

      Similarly, you can use Zone From/To to limit the samples that are input. Zone From/To is useful for layered deposits. You can use it, for example, to include samples from a conglomerate layer near the top of each sample, to the layer of shale further down each sample.

    3. Click Next.
  3. On the Define Query Constraints form:
    1. Select the Field name for the field you want to constrain.
    2. Select the Operand that you want to use to constrain the field.
    3. Type the constraint value.
    4. Repeat steps a-c for all fields that you want to constrain.
    5. For example you might constrain by the x, y, and z fields when you have samples over a large area but you want to estimate only within a relatively small volume of ground. For another example, if you have stored data for more than one project in the same geological database, you might constrain to project=<name of one of your projects>.

  4. On the Selected sample data summary form:
    1. Check that the Attribute, Min value, Max value, and Sample count are accurate for the data you want to select.
    2. Click Finish.

    Dynamic Shells opens, and the drillhole traces of the data you have selected are displayed in Graphics.