The Oz Machine is a Java applet designed to accompany John Doveton's online tutorial on geological interpretation of wireline logs. It provides an interactive exercise to help students gain experience in the interpretation of lithology (rock type) from a suite of well logs. Well logs represent measurements of various properties (electromagnetic, acoustic, nuclear) of the rocks and fluids encountered by a wellbore and are used by petroleum industry analysts to guide decisions regarding further well development and investigation.
The Oz Machine generates and displays a set of logs based on a synthetic lithological sequence and provides a palette of 14 lithologies with which to "paint" a lithological column in the depth track of the log display. Alternatively, sequences may be generated with true lithologies shown in the depth track, giving you the opportunity to study the log-lithology associations for any number of sequences. The logs employed in the synthetic analysis are gamma ray, neutron porosity, density porosity, and photoelectric factor.
The Oz Machine requires Java 1.3.1 (or higher). If necessary, you can download the Java Runtime Environment (JRE) from java.com.
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This zip file contains a standalone (application) version of the Oz Machine which is able to read LAS files, allowing interpretation of lithologies from actual logs. The zip file also contains two example LAS files. Download the zip file and extract the enclosed folder to your hard drive. Open the folder and double-click on OzMachineApp.jar to run the application. (Zip file updated Oct. 25, 2010.)