Select the reservoir rock from the drop-down list to populate the Bulk modulus, Shear modulus, and Density fields with typical values, which you can change.
When you change a value, the drop-down list above the Bulk modulus field displays Custom.
For detailed derivations, click Calculator to display the Minerals Calculator dialog box and specify the mineral composition in your zone of interest.

Select the hydrocarbon to populate the Bulk modulus and Density fields, which you can change.
When you change a value, the drop-down list above the Bulk modulus field displays Custom.
For detailed derivations, click Calculator to display the Batzle and Wang Fluid Properties Calculator dialog box and specify more precise values for your zone of interest.

Select the reservoir fluid to populate the Bulk modulus, Density, and Water saturation fields, which you can change.
When you change a value, the drop-down list above the Bulk modulus field displays Custom.
For detailed derivations, click Calculator to display the Batzle and Wang Fluid Properties Calculator dialog box and specify values specific to your zone of interest.
For the Water saturation value, instead of typing a value, you can instead drag the slider below the field. Note that the fluid average at the bottom of the dialog box changes as you change the water saturation percentage.

Select Reuss iso-stress if fluid ratios are consistent in pores throughout the zone of interest; otherwise, select Voight iso-strain.