Overburden Density

On the Overburden Density form (1D MODEL > Overburden > Overburden Density) you can select logs (source logs, composite logs, or pseudo density logs) as the input for the overburden calculation, or you can calculate the overburden from the regional data using the TVD property table. When using logs as the input for the calculation you can open the Overburden Calculation View in Step 2, which presents you with the Compositor Overburden Density track, the functionality necessary for creating the composite overburden density log followed by the overburden stress log.

  1. In the Create OB Density section, select the data source type to use for the overburden calculation:

    From log composition  When selected, you can select the associated Density and Pseudo Density logs by checking the adjacent checkbox.

    From regional data  When selected, select a property table, or click the Edit button to open the Regional Data table, where you can manually create depth values, copy and paste from a spreadsheet or import as a LAS file. In the Regional Data table, specify the Property template as Overburden Density. Then click Create.

  2. Click Show to open a Well View. In the track, you can fit a trend line where data is missing or is of poor quality. Note that when caliper logs are available, they are displayed in this view. Next, you compose the Overburden Density curve from the selected log curves and/or based on the trend line. Make sure you select the correct depth type (MD or TVD) while generating a trend line. You can adjust the trend line parameters in the Inspector pane.
  3. If you create the Composite Overburden Density curve, make sure no gaps exist in the curve. Use the context menu of the log property in the JewelExplorer and select Tools and Operation > Fills Gaps option to fill the gaps in the curve.
  4. Based on the available density and pseudo density logs, you can create multiple composite overburden logs. On the form, you can assign an Overburden Density log from the drop down menu in the Assign OB Density section. Click Show to view the log on the Overburden Calculation view.

Based on the composite overburden density log, calculate the overburden stress in the next step of the workflow on the Overburden Stress form.