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 type allows you to process the oriented core data into true Dip/Dip Direction (or Strike/Dip, or Trend/Plunge). It also allows you to apply 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 a processed oriented core taken from a curved borehole (e.g., already processed using DIPS or other application), or if measurements are processed from a 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.

Data Orientation Convention

The Data Orientation Convention refers to the orientation format of the data collected on a Traverse. For each Curved Borehole Oriented Core discontinuity, the orientation format of the data you enter in the first two columns of the Discontinuities grid (in the Orientation Data dialog) is always Alpha/Beta, which refers to the local angles Alpha and Beta for discontinuities logged on oriented core. See the Borehole Oriented Core topic for the definitions of Alpha/Beta.

The raw Alpha/Beta data orientations are unprocessed and only have meaning relative to the oriented core's orientation. Alpha/Beta input orientations will be automatically converted to the equivalent Reporting Orientation when viewed in the Pole Data Grid and in other analysis options.

Traverse Format

The Traverse Format for a Linear Borehole Oriented Core Traverse requires Orient 1 and Survey Data.

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 Borehole Oriented Core topic for the definition of Orient 1.

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