The Log page in the Property Manager includes options for defining dip column, dip direction column, dip range, and keyword column for a tadpole log. To view and edit tadpole log properties, click on the tadpole log in the view window or Object Manager to select the log. Then, click on the Log tab in the Property Manager.
Set the tadpole properties on the
Log tab in the Property Manager.
The Hole ID filter is used to select the borehole to associate with this log. Only those Hole IDs that are currently associated with data tables in this project are listed. To change the Hole ID Filter, click on the existing Hole ID and select the desired Hole ID from the list. The log automatically updates to show the new borehole.
When the Logs object is selected in a cross section view, the Hole ID filter is not available. To set a specific log to a particular Hole ID, click on that individual log and set the Hole ID filter to the appropriate log.
Use the Table to define the data table for the tadpole log. The table type can be an interval table or a depth table. If the table is a depth table, the points are plotted at the depth listed in the table. If the table type is an interval type table, the depth is determined by calculating the mid-point position between the To and From columns in the corresponding table. To change the table, click on the existing table name and select the desired table from the list.
The Tadpole dip column is the column in the selected Table that is being displayed by the tadpole log. The Tadpole dip column determines the location of the symbol horizontally. When the Table is changed to another table, the Tadpole dip column list is automatically updated to display the column names in the newly selected table. To change the column, click on the existing column name next to Tadpole dip column and select the desired column from the list.
The Tadpole dip direction column is the column in the selected Table that determines the angle that the symbol in the tadpole log is pointing. When the Table is changed to another table, the Tadpole dip direction column list is automatically updated to display the column names in the newly selected table. To change the column, click on the existing column name next to Tadpole dip direction column and select the desired column from the list.
The Keyword column is the column in the selected Table that specifies the type of measurement or structural class of the data, and is used to set the properties of the symbol in the tadpole log. When the Table is changed to another table, the Keyword column list is automatically updated to display the column names in the newly selected table. To change the column, click on the existing column name next to Keyword column and select the desired column from the list.
The Keyword column is used for keyword matching. If you do not want to use a keyword scheme and simply want to plot intervals of data, uncheck the box next to the Use keyword scheme option and all symbols will have the same properties, as set on the Symbol tab.
If the options on the Symbol tab and the Font section on the Label tab are not available, a scheme is likely being used. Uncheck the Use keyword scheme option to turn off the display of the scheme properties and set the line properties on the Line tab and the font properties on the Label tab.
The Hole inclination column (or Hole dip column) is used in combination with the Hole azimuth column to calculate the true vertical depth for the hole. Either Hole inclination column or Hole dip column is displayed. To control whether inclination or dip is used, click the File | Options command. In the Options dialog, check or uncheck the Use Hole dip instead of inclination option.
Inclination is the angle the borehole is oriented in degrees and varies from 0 to 180. 0 indicates vertical pointing down, 90 indicates horizontal, and 180 indicates vertical pointing up. Negative and positive inclination values are treated the same for depth calculations. Negative inclination values are treated differently for well path calculations in the cross section and map views. A negative inclination changes the direction (azimuth) to the opposite of the similar positive inclination. For example, the azimuth value of 90 and inclination of 45 describes the same orientation as the azimuth value of 270 and inclination of -45 degrees. Both combinations describe an eastward direction at 45 degrees down from the horizontal plane.
Dip is an alternate method of calculating the angle the borehole is oriented. Dip is oriented in degrees and varies from -90 to 90. -90 indicates vertical pointing down, 0 indicates horizontal, and +90 indicates vertical pointing up.
Azimuth is the compass orientation of the well's deviation, in degrees and varies from 0 (true vertical north) to 360. Azimuth values are measured relative to true north (not grid north in the local coordinate system).
To set the Hole inclination column or Hole dip column, click on the existing option and select the desired option from the list. Available options are [Unspecified], [From collars table:collars name], [From survey table: survey name], or data columns in the selected Lithology table. When one column is set to unspecified or survey table, the other column automatically changes to the same option. When recorded in a collars table, the inclination/dip and azimuth apply to the entire well length. When recorded in a survey table, the inclination/dip and azimuth apply from the depth to the next recorded depth. When set to one of the columns in the existing table, each log is updated independently from each other log using the information in the specific depth or interval tables. If the Hole inclination column for the log is set to [Unspecified], an inclination value of 0 is used for the calculations. No difference will be visible for the log when changing the Depth method to True vertical depth.
The Use keyword scheme option sets whether the symbol properties should be based on a keyword scheme or all symbols should use the same properties. To use a keyword scheme, check the box next to the Use keyword scheme option. To use the same properties for all symbols on the tadpole log, uncheck the box next to the Use keyword scheme option. The keyword scheme should match the text that appears in the Keyword column.
The Keyword scheme is the scheme that
determines the symbol properties when the box next to the Use
keyword scheme option is checked.
The selected scheme should match the text that appears in the Keyword
column. To change the scheme, click on the existing scheme name
and select the desired scheme from the list. Click the 
next to the scheme name to open the Scheme
Editor, where the scheme can be created or edited.
The Axis type is Linear or Logarithmic. The data must be greater than zero when using a Logarithmic axis. Values equal to and less than zero are ignored in the log when Logarithmic is selected. Logarithmic uses a log (base 10) scale for the horizontal axis. To change the axis type, click on the existing option and select the desired option from the list.
The horizontal scale can be set manually or automatically with the Auto dip range option. Check the Auto dip range check box to calculate a best-fit range of the data. When Auto dip range is unchecked, the Minimum value and Maximum value properties are enabled allowing manual control over the log's minimum and maximum values. To change the data range, click on the existing option and select the desired option from the list.
The Minimum value and Maximum value are only available if the Auto dip range check box is not checked. The Minimum value is the smallest value that should be displayed on the log. The Maximum value is the largest value that should be displayed on the log. To change the minimum and maximum values, uncheck the Auto dip range check box. Then, highlight the existing value in Minimum value or Maximum value and type the desired value.
If the borehole is changed, the new data may or may not fit into the user-defined range. If the data does not fit inside the range, change the Minimum value and Maximum value to new values or check the Auto dip range check box.
See Also