In Danomics Petrophysics Insights users are guided through a workflow that walks them through a number of modules. These modules are located via a dropdown menu at the top center of the window. The modules are listed in the order in which a user should ideally proceed through a project. However, this order is not strictly enforced and the user can start at any module and can seamlessly move both forward and back through the modules. This help article will focus on the Bad Hole ID module.

Badhole Identification

Navigate to the Bad Hole ID module using the dropdown selection menu located in the top-middle area of the window. Within this module there are four options for flagging zones that suffer from washout.

There are four options for flagging bad hole:

  1. Caliper Badhole Max
  2. Caliper Rugosity Badhole Max
  3. RhoB Badhole Min
  4. Drho Badhole Max

Caliper Badhole Max evaluates if the caliper curve is greater than the Caliper Max parameter value, which is entered on a zone-by-zone basis. Intervals where the curve exceeds the parameter value are flagged as badhole, while intervals where the curve is less than the parameter are not flagged.

Caliper Rugosity Max evaluates if the absolute difference between a smoothed caliper curve and the actual caliper curve exceeds the Caliper Rugosity Max parameter value. Intervals where the curve exceeds the parameter value are flagged as badhole, while intervals where the curve is less than the parameter are not flagged.

RhoB Badhole Min, marks all zones where the RhoB curve is less than the Rhob Min parameter as badhole, while intervals were the curve is greater than the parameter are not flagged.

Drho Badhole Max evaluates if the caliper curve is greater than the Drho Max parameter value, which is entered on a zone-by-zone basis. Intervals where the curve exceeds the parameter value are flagged as badhole, while intervals where the curve is less than the parameter are not flagged.

Badhole Results

The resulting badhole curve uses the composited results from each of the selected methods. For example, if all four methods were selected if one or more flagged an interval as being badhole, the final result would be a badhole value of 1.

The final curve, “badhole” is used in subsequent modules to flag areas of density curve washout for the Clay Volume and Porosity modules.

Categories: HelpPetrophysics