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Curved Borehole Oriented Core

The Curved Borehole Oriented Core Traverse Type should be used when you have:

  • A non-linear borehole with curvature defined by a survey file
  • Unprocessed oriented core with joint orientations recorded as local Alpha / Beta angles on the core.

The Curved Borehole Oriented Core Traverse option allows you to process the oriented core data into true Dip/DipDirection or Strike/Dip; and to apply the Terzaghi Weighting to the joints, by determining the orientation of the borehole for each joint measurement and applying the appropriate weighting factor based on the relative orientation of the borehole and the joint plane.

If you have processed oriented core taken from a curved borehole (e.g., already processed using Dips or other application), or if measurements are processed from Televiewer, then you can use the Curved Borehole Televiewer option rather than the Curved Borehole Oriented Core option, to apply the Terzaghi Weighting to the measurements.

Traverses Tab

Traverse ID

For a Curved BH Oriented Core Traverse, the default Traverse ID will have a "CBH-OC" prefix (e.g., CBH-OC1, CBH-OC2, ...) when you initially add/create Traverses. After adding Traverses you can change the default ID values to any numeric or alpha-numeric values.

Data Format

For a Curved Borehole Oriented Core Traverse, the Data Format is always Alpha / Beta, which refers to the local angles Alpha and Beta for discontinuities logged on oriented core.

In the Dips Grid Data view you must enter Alpha / Beta values in the Orientation Columns for Curved BH Oriented Core Traverses. This overrides the Global Orientation Format, which is not applicable for Traverses which use oriented core. See the oriented core data topic for the definitions of Alpha / Beta.

Traverse Format

The Traverse Format for a Curved Borehole Oriented Core Traverse is Orient 1 + Survey File .

Example of Traverse Information dialog with one Curved BH Oriented Core Traverse

Traverse Information dialog

  • The Survey File data is entered in the Survey Data tab in the Traverse Information dialog.
  • Orient 1 has the same definition as for a Linear Borehole Oriented Core Traverse. See below for details.

Orient 1

For a Curved Borehole Oriented Core Traverse, the Orient 1 value has the same definition as for a Linear Borehole Oriented Core Traverse. It is the angle from the top of core to the Reference Line, measured clockwise looking in the down core direction. See the Linear Borehole Oriented Core topic for details.

NOTE: For a Curved Borehole Oriented Core Traverse, it is assumed that the value of Orient 1 is constant for the entire length of the curved borehole Traverse. If this is not the case, then you will have to define a separate Traverse for each change in the value of Orient 1 along a curved borehole.

Collar Data Tab

The Collar Data tab allows you to input the corresponding collar data for the borehole. See the Collar Data topic for more information.

Survey Data Tab

The Survey Data tab allows you to input the corresponding survey data for the borehole. See the Survey Data topic for more information.

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