Building Equations using the Log Equation Library

A library of standard functions or equations ships with GeoSyn. While you can't overwrite the default equations in this library, you can copy them as user functions and then modify or delete them. Because the function library is centralized, any GeoSyn model can access the equations you create.

GeoSyn users with their own equations created with versions of GeoSyn before the function library was introduced can open the model that contain these equations and save the equations to the function library so that they're available to all models.

The general Log Equation Library dialog box, which is used to create equations for any log type, is accessed through several different dialog boxes available from the Edit menu. You can also invoke the Log Equation Library dialog box for only a specific log using the Well Properties > Log Properties dialog box.

To create log equations:

1. Launch the Log Equation Library dialog box by selecting one of the following:

Edit > Log Editing > Log Math, and then click Edit.

Edit > Configuration Properties > Log Library, and then click Edit Curve Equations.

The Log Equation Library dialog box appears.

2. From the Log type drop-down list, select the log type with which to associate the equation you create. The equation is grouped under this log type to facilitate selection from drop-down lists.

3. Do one of the following:

Select an existing equation upon which to base your new equation from the Log function drop-down list and then modify the equation parameters using either of the next two options.

Drag equation elements from the three equation panes into either the Metric or Imperial boxes.

Simply type your equation directly in the Metric or Imperial boxes.

4. Depending on whether you created your equation in the Metric or the Imperial box, click Down or Up to copy it to the adjacent box and then modify your equation with a conversion factor.

5. In the first box of the Descriptions, type a description of the equation function. You may even want to paste the equation from the Metric or Imperial box into here as a description. What you type here populates the Log function box when you click either Update or Add.

You may want to type additional details in the second description box. Text you type here only appears in the Log Equation Library dialog box.

6. Click Add (if you're updating a previous user equation instead of creating a new one, you can click Update instead). And then click Close to exit the Log Equation Library dialog box.

Related Topics

Applying Math Equations to Logs