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Curved Borehole Televiewer

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

  • A non-linear borehole with curvature defined by a survey file
  • Joint orientations processed into true dip/dipdirection or strike/dip readings using televiewer or other method (e.g., processed oriented core)

The Curved Borehole Televiewer Traverse option allows you to apply the Terzaghi Weighting to joints measured on a curved borehole, 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 unprocessed oriented core taken from a curved borehole (i.e., Alpha/Beta angles) then you should use the Curved Borehole Oriented core option rather than the Curved Borehole Televiewer option.

Traverse ID

For a Curved BH Televiewer Traverse, the default Traverse ID will have a "CBH-T" prefix (e.g., CBH-T1, CBH-T2, ...) 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

The Data Format options for a Curved Borehole Televiewer Traverse are the same as for a Linear Traverse.

  • Dip/DipDirection
  • Strike(Right)/Dip
  • Strike(Left)/Dip
  • Trend/Plunge

See the Linear Traverse topic for details.

Traverse Format

The Traverse Format for a Curved Borehole Televiewer Traverse is Survey File. The Survey File data is entered in the Survey Data tab in the Traverse Information dialog. See below for details.

Example of Traverse Information dialog with one Curved BH Televiewer Traverse

Traverse Information dialog

Collar Data

For Curved Borehole Televiewer Traverses, the collar data is entered in the Collar Data tab in the Traverse Information dialog.

  1. Select the Collar Data tab.
  2. Select the Add button to add the required number of rows. This should correspond to the number of Curved BH Televiewer Traverses defined under the Traverses tab.
  3. Enter the Traverse ID for each Traverse. The Traverse IDs should be the same as entered under the Traverses tab. You can use Copy/Paste to transfer the Traverse IDs.
  4. Enter the XYZ values of the collar locations (XYZ = Easting, Northing, Up).
  5. Enter the Total Depth (length) of each Curved BH Televiewer Traverse.

NOTE: The Collar Data is not currently used in the Dips analysis, however it will be used for filtering and viewing purposes in a future update.

Survey Data

For Curved Borehole Televiewer Traverses, the survey data is entered in the Survey Data tab in the Traverse Information dialog.

  1. Select the Survey Data tab.
  2. Select the Add button to add the required number of rows. This should equal the total number of survey readings for ALL Curved Borehole Traverses that you are defining.
  3. Enter the Traverse ID for each survey point. Traverse IDs entered in the Survey tab should correspond to those entered in the Traverse tab and Collar tab.
  4. Enter the Distance readings for the survey points.
  5. Enter the Trend / Plunge readings for the survey points.

NOTE:

  • The orientation format convention for survey file data is always Trend / Plunge. This is equivalent to the standard Azimuth / Dip terminology commonly used to record borehole survey orientations.
  • The conventions used for Plunge (e.g., positive or negative) are determined in the Settings Settings dialog dialog, see below for details.
  • For multiple Traverses, data is entered consecutively in the ID, Distance, and Trend / Plunge columns for all Traverses.

Curved Borehole Options

For Curved Borehole Traverses, if you select the Settings Settings button button at the bottom of the Traverses Information dialog, the following options are available.

PLUNGE OPTIONS (SURVEY DATA)

There are two options for defining the Plunge convention for Survey Data:

  • Negative = Down, Positive = Up
  • Positive = Down, Negative = Up

If you choose the Negative = Down option, then negative plunge values will represent the downward direction for the Survey Data.

If you choose the Positive = Down option, then positive plunge values will represent the downward direction for the Survey Data.

NOTE: This option only applies to Survey Data Plunge values entered for curved Traverses in the Traverse Information dialog. It does not affect the data conventions used in the main Dips Grid Data view.

DE-SURVEY OPTIONS

For analysis purposes, curved borehole surveys in Dips are represented by a series of linear segments.

There are two possible de-survey options.

  • The Linear, at segment ends option, will directly connect the survey points with linear segments.
  • The Linear, at mid-points option, will assume each survey point is the mid-point of a linear segment, and generate the segments accordingly.
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