Creating saturation logs

Once you finish defining your saturation function model, it is crucial to validate and verify your model. To QC your model at well level, you can use the Saturation Logs tool (model > Saturation > Tools > Saturation Logs). This is to ensure that everything has proceeded as intended and that you are able to reproduce the expected saturation match between the modeled Sw (i.e. based on your saturation function model) against the observed Sw (i.e. from well log interpretation or from core analysis).

Keep in mind that the saturation function model parameters can be scale dependent. When you create saturation logs for QC purposes, the resolution of the modeled Sw will depend on the resolution of the assigned input (on the Rock Properties form). You can assign either high resolution logs or their associated upscaled pseudo logs. Even though you apply the saturation function model at the grid cell level (via the Saturation Property Modeling workflow), you can validate its accuracy by comparing to high resolution logs or low resolution logs, i.e. upscaled logs.

To create saturation logs

  1. On the Create Saturation Log form, select the saturation function model from the Function model drop-down list.
  2. The log sets which you have assigned on the Rock Properties form are used as input for calculating saturation logs.
  3. Keep in mind that the fluid leg logs which are output from your fluid model are used as input for calculating saturation logs.
    4. Important   If you update your fluid model, update your fluid leg logs via the Fluid Model Logs tool (model > Fluids > Output Tools > Fluid Model Logs).
  4. Click Apply to create the saturation logs and keep the form open, or click OK to create the logs and close the form.

Sw, So and Sg logs are created and appear in the JewelExplorer with the suffix of the saturation function model name under Well Data > All Logs. For the saturation function model with paleo FWL, three additional log type properties are created: residual saturation (Sr), connate water saturation (Swc), and the initial water saturation in paleo times (Swi_Paleo).

Saturation logs in the JewelExplorer. If you edit the name of your saturation function model, the log name will be automatically updated.    click to enlarge

If you right-click on All Logs and select 'Sort Logs per Property Template' the saturation logs will appear in three separate subfolders, or six subfolders when creating logs for saturation function with paleo fluid model:

Sort the saturation log properties by Property Template. For a saturation function with paleo fluid model three additional log properties are created (connate water, initial paleo water and residual hydrocarbons).    click to enlarge

  • Saturation (connate water)
  • Saturation (gas)
  • Saturation (initial paleo water)
  • Saturation (oil)
  • Saturation (residual hydrocarbons)
  • Saturation (water)