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CycloLog Version 2010c Tutorial Manual – Part 16
Version 2010c
Tutorial Manual
Part 16
The Lithology Module
Includes following topics:
1. Working with the Lithology library
2. Generating lithology in a GR log
3. Displaying the lithology log
Copyright
The CycloLog® Software and all accompanying documents are patented and copyrighted with all
rights reserved by ENRES Energy Resources International B.V. The Software and documentation may
not be given or sold except by ENRES Energy Resources International B.V. and its designated suppliers.
Unauthorised copying, duplicating, selling or otherwise distributing the Software or documentation is
a violation of the Copyright Law.
CycloLog Patents Nr. 1015928 Netherlands, Nr. 1-182466 Europe
CycloLog is a registered trademark of ENRES Energy Resources International BV
INPEFA is a registered trademark of ENRES Energy Resources International BV
ENRES is a registered trademark of ENRES Energy Resources International BV
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CycloLog Version 2010c Tutorial Manual – Part 16
The Lithology Module
A new feature in CycloLog 2010c version is the lithology module. In this
part of the CycloLog Tutorial we explain how to define and work with the
lithology library and how to generate a lithology log in CycloLog.
The Lithology Library
When installing CycloLog, the lithology library is automatically stored in
the Program Data folder of your computer. The lithology patterns in the
library are the default patterns that CycloLog uses to define lithologies.
Of course, it is also possible to upload your own patterns into the library.
In this case, the new pattern will be saved in the CycloLog library and,
consequently, stored in the Program Data folder.
Note that any changes made to the library will be preserved if a newer
version of Cyclolog is installed.
It is wise to pre-define lithologies in the lithology library prior to creating
a lithology log. Therefore, you will have to have an idea of the different
lithologies that you expect to be present in the log.
To create and edit lithology patterns in the lithology library:
 Go to Tools → Lithology Library;
 The Lithology Library dialogue box opens;
 In here you can add and edit lithology patterns:
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 To create a new lithology pattern, click Add;
 The Create Lithology Unit dialogue box opens;
 Insert a Name and Code (and optional Description) for the new
pattern;
 You can assign the new pattern to a lithology Group (available
groups in CycloLog: Carbonates, Chemical, Clastics, and Other);
 Select a Target for the new pattern;
 Load a pattern EITHER from the default lithology library (navigate
to ProgramData→ Enres International → CycloLog → Lithology →
Library) OR a pattern of your own (in this case, the pattern file can
have either the "bitmap" file format (.bmp) or the "tagged image
file" format (.tif, .tiff));
 Adjust Back- and Foreground colour;
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 Click OK; the new pattern is saved in the Library.
An example of a lithology library is given below. Note that checking the
box Group by lithology group, the library will be displayed as below. If
you have assigned you lithology patterns to a certain target, then you
may also check the box Filter by target.
Note that you can also Batch Add lithology patterns to the library.
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Generating lithology from a GR log
You can use any log to generate a lithology log in CycloLog, but since the
GR log best expresses lithological variation it is advisable to use this log
for making your lithology log.
To define lithology in a GR log:
 Open the GR log;
 Right click on the pane, a context menu appears;
 Select Display → Lithology Palette;
 The lithology Palette dialogue box opens, and looks like this:
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 This histogram shows the frequency of occurrence of the GR
values (in API units). In here, you can identify and subdivide
‘lithology’ populations and assign them a specific lithology unit
and pattern. Note that the GR values have been assigned the CSST lithology, because the box Group by lithology group was
checked in the lithology library.
 Double-click on the horizontal axis; a green peg appears that can
be moved along the axis;
 You may want to define different population ranges, therefore,
double-click on the horizontal axis to add more pegs;
 To delete a range, right-click on the peg and select one the options
in the context menu;
 Note that the position of pegs can also be set in the Peg value
box;
 In the example below, four lithology populations have been
identified. The two populations at the margins of the histogram
are considered as outliers.
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 To assign a lithology pattern, click on one of the ‘lithologies’ listed
in the lowermost window, and then click on Lithology (you may
also double-click in the list);
 The Lithology Library Dialog box opens from which you can select
the lithology patterns;
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In the example below, four different lithology populations have been
identified and defined. The populations at the margin have been
assigned a blank colouring.
 Click OK.
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Displaying the lithology log
To display the results created on the former page,
 Right-click on the GR pane, and select the Lithology bucket for
colour filling the GR log;
 You may change the display of the fill by selecting Display →
Lithology Fill → Left or Right.
Application of Lithology yields the following colouring of the GR log:
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The new lithology log can be added to the composite well chart (see
Tutorial Manual, Part 4).
Note that it is not necessary to duplicate the GR log to save the defined
lithology fills. The lithology fill can be toggled on/off. However, each
modification made in the lithology palette will automatically be applied
to the fill.
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