Validating rock types

On the Validate Rock Types form (1D MODEL > Lithology > Settings > Validate Rock Types) you can review the rock types that are available in your solution and their related rock property assignments, including the equation type and input parameters for each rock property. The rock types defined on this form comprise all of the rock types that are available for use in your solution. While a standard set of rock types is available initially, all rock types can be modified to suit your project or entirely new rock types can be created and used in the workflow. Although you can only modify rock types from within a single, specific solution, you can make use of any of your modified or new rock types across JewelSuite solutions by exporting the rock types via the Import/Export Rock Types form.

The Validate Rock Types form consists of two panels that you use together to review, modify and create rock types.

  • The left panel contains the list of rock types in the solution; in this panel you can select the active rock type, copy, create and delete rock types.
  • The right panel contains tabs displaying the rock property settings and input parameters for various rock properties. The equation type and input parameters for each of the properties can be modified in this panel, including the creation of user-defined equations if needed.

To modify the data for an existing rock type, select one of the rock types in the left panel of the form to activate it. When active, the name of the rock type appears at the top of the right panel. Once selected, you can examine and modify the equations and input parameters for each of the properties.

The various tabs available at the top of the right panel represent the different properties of the selected rock type. The calculated properties for each rock type are: uniaxial compressive strength (UCS), internal friction, pseudo-density from the acoustic log (acoustic density), VP to VS conversion, porosity calculations (from acoustic, density and resistivity logs), dynamic and static Poisson’s ratio, dynamic and static Young’s modulus and drilling exponent. Equation and input parameter information is displayed for the active property. Other properties not listed here are also calculated for use and can be displayed on any track in the Well View, including the bulk compressibility and the bulk modulus. You can also create your own Adding custom rock properties.

The settings for the rock types are:

Output Log (Read-only) The active output log for the rock property. The associated output log is displayed in this text box once you have run the calculations on the Rock Properties form.

Equation Type  Lists a number of standard equations available for calculating the active property. When you select a theoretical model from the drop-down menu, the Formula field shows the equation used to calculate the property. Details on the default equation types can be found here. Two additional options are always available in this drop-down: "Create new" to create a new equation and "<no equation>" (this option could be used if gap is desired in the calculated rock property log for the selected rock type).

Formula  Displays the equation for the selected rock property equation.

Output unit  The measurement unit for the output data.

Name  Used when creating a new user defined equation, enter the name of the new equation here.

Input Parameters  Only the input parameters that apply to the selected rock type are active in this view. For each eligible parameter an input log can be selected from the available logs of the parameter type. For example, only gamma ray logs appear in the list of logs to select for the GR parameter.

Delete  This button is only active if a user-defined equation is present. If you wish to delete your user-defined equation, click this button.

Edit  This button is only active if a user-defined equation is present. Click this button to turn the form into the Edit mode. In this mode the formula parameters (such as name, equation string and the units) can be modified.

Create  This button is only active if a "Create new" options was selected and a user-defined formula name is typed into the Name text field. Click this button to create the user-defined equation.

Make sure you have selected the Rock Type of your choice in the left panel on the form. Next, you can define your own rock property by clicking the green plus sign next to the tabs .

This opens the New Rock Property dialog where you give your property a name and select the log type. To populate the Validate Rocky Type form with only the relevant input parameters, select one of the listed options for parameters. Click OK to close the dialog and to add a new tab to the Validate Rock Types form.

The next step in the process is specifying the formula in the Formula field. To aid you in entering your formula, the Math Functions section of the view contains various calculator buttons. You can insert the parameters in the formula field with a single left mouse button click. After you have entered the formula, select the units for the resulting property from the Output Unit list box and name the new equation in the Name field. Click Create to add your equation to the list.

You then need to calculate the log using the Rock Properties form. The newly created rock property is listed in red in the Custom Rock Properties table. After you have calculated the log, the log is listed in black.

You can define your own equation to calculate a property by selecting Create new for Equation Type.

The next step in the process is specifying all the settings. To aid you in entering your formula, the Math Functions section of the view contains various calculator buttons. After you enter the formula, you select the units for the resulting property from the Output Unit list box and name the new equation in the Name field. Click Create to add your equation to the list. 

Beyond changing the equation and input parameters for a rock type, you can create completely new rock types for use in any solution. See Creating and modifying rock types for more information.