WellCAD Basics - Advanced Logic Technology

86 - BOOK 1 - WELLCAD BASICS
www.alt.lu
Import:
If point data (depth-value pairs) is imported into Mud, Interval or Well Logs the
user can enable the Allow multiple logs option. This option assigns one Mud,
Interval or Well Log to each data column found in the data set (the Interval Log
assumes the first two columns of the ASCII data set to be top and bottom depth).
Single Log Import
If the Allow multiple logs option stays disabled the following final dialog box is
presented to the user.
Step 3 of the Text File Import Wizard for single log import
Log Type:
The Log Type drop down list allows selecting the log type that corresponds to the
incoming order and format of columns. If you do not remember the format of a
certain log type refer to Appendix A or open a log of the same type in the WellCAD
Tabular Editor. If your data set does not correspond to the requested format you
can use a text editor or EXCEL to add the missing columns or to rearrange the
column order. Note: The Well Log type assumes a constant sampling rate. The data
column is build from the bottom to the top. During data import expected sampling
step (determined from top and bottom depth in the file and the number of data
points) and sampling step read from the file are compared. If these do not match the
data will be imported into a Mud Log type to avoid a depth shift at the top.
Axis:
As long as you are dealing with only a single depth axis – the master depth axis – in
a borehole document, you leave the Default Depth option. The drop down control
lists each Depth Column Log contained in the Borehole Document that could be
used as a depth axis. The following example explains how you could use the Axis
settings: Imagine you have a borehole document with a master depth axis