Stiffness Calculator

The Stiffness Calculator tool (1D Model > Horizontal Stress) is used for calculating the coefficients in the rock stiffness tensor, Biot's coefficients and the Thomsen coefficients for the defined rock types in your 1D case. Via the tool you open the Rock Dependent Stiffness form where you can use the standard default equations to calculate these coefficients, or you can also enter user-defined equations where you can provide the correlations manually. Once you have defined the correlations, the resulting values are saved as logs in the JewelExplorer and plotted in the Stiffness Matrix Elements view with each track showing the coefficient log.

Using the Stiffness Calculator tool

1. The workflow on the tool begins with defining the correlations and constants, that you want to use to calculate the coefficient log values for every rock type. Click on the Show button in the Show Rock Types section to open the Rock Dependent Stiffness dialog. On the dialog, you select the Rock Type on the right side for which you want to define the coefficients. On the left side of the dialog, there are multiple tabs each to define the correlation for the coefficients. On the first tab, you define the constants for rock mechanical properties and select the failure criteria.
   When defining the correlations for each coefficient, the labels will be shown in red color if the calculation has not been finished or if there is a missing input. As the correlation is validated with input parameters, the red color on the label is restored to default.
2. In the Show Matrix Elements section, you select the coefficients that you want to display on the Stiffness Matrix Elements view. Check the adjacent checkbox to select the coefficients.
3. Click (Re)Calculate to generate the logs for coefficients or update the existing logs.
4. Click Show to display the coefficient logs on the Stiffness Matrix Elements view.