Lithology Codes

The use of lithology codes is optional. If required, provide allowable rock types to define which intervals are waste and which intervals are product based on both the logged horizon name and a rock type. Defined rock types correspond to entries in the field in the database associated with the rock type synonym.

Lithology codes

Use rock codes only

Rock codes further define which portions of a horizon are considered product. Define a Rock type field on the Drillhole Scheme pane to use this option. Next, define Rock codes on the Lithology pane in one of two ways:

Enter Codes directly into the pane.
Select an existing text File.

Note: In both cases, separate rock codes with commas or spaces. Entries are case-sensitive. An example may be ST, CO or ST CO.

Use rock codes and percentages

Rock codes and percentages further define which portions of a horizon are considered product.

As an example, assume CO is a defined rock code with a percentage of 50. If a continued interval is defined as 70% Sandstone ( SS ) and 30% Coal ( CO ), the interval would be considered waste.

Define fields which contain Rock types, Continuation codes, and Percentages on the Drillhole Scheme pane. Next, define Rock codes and percentages on the Lithology pane in one of two ways:

Enter Codes directly into the pane.
Select an existing text File.

Note: In both cases, separate rock codes and percentages with commas. Separate rock code/percentage combinations with commas or spaces. Entries are case-sensitive. An example may be CO, 50 CL, 20 or CO, 50, CL, 20.

Ignore percentage values in the file

Select this box to ignore the percentage values contained in the selected text file.

Intercepts with no percentage data (but matching rock) count as acceptable

This is selectable when defining Rock codes and percentages earlier in the Lithology pane. The option includes database intervals where rock type matches defined codes, but no percentage data is included.

The same file may be used both for codes alone and for codes and percentages. Percentage values will be ignored if they are present when used for codes alone. Missing percentage values will be treated as 100% when used for codes and percentages. In all cases, the rock codes provided may contain wildcards. For example, C* will match all occurrences of CO, CD, or CL on an intercept record).

Intercepts with no rock data count as acceptable

Select this to include database intervals where the rock type has not been logged as part of the product.